Develop Reference

MPAndroidChart: Multiple markers at the same highlight

I want to show on click, three tooltips/markers, with only one dataset.
Like in the below image:
How can I do it?

I have created a LineChart and gave data to it.
and for multiple markers i have created a class implementing IMarker and created 2 Object
of a class i made for the information of each marker.
the way which the second marker is shown , depends on the position of first marker.
and i know it is not a good implementation maybe , but worked...
here is the code that worked for me:
public class ImageMakerTwoINOne implements IMarker {
private Context mContext;
public static final String TAG = "marker class";
ObjectImage o1 = new ObjectImage();
ObjectImage o2 = new ObjectImage();
//constructor for initialization
public ImageMakerTwoINOne(Context context, int drawableResourceId,int drawableResourceId2) {
mContext = context;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
o1.drawable = mContext.getResources().getDrawable(drawableResourceId, null);
o2.drawable = mContext.getResources().getDrawable(drawableResourceId2,null);
} else {
o1.drawable = mContext.getResources().getDrawable(drawableResourceId);
o2.drawable = mContext.getResources().getDrawable(drawableResourceId2);
}
}
//////////////////////////////offset////////////////////////////
//setting the offsets by the users
public void setOffset(MPPointF offset,MPPointF offset2) {
o1.offset = offset;
o2.offset = offset2;
//in case they were null :
if (offset == null) o1.offset = new MPPointF();
else if (offset2 == null) o2.offset = new MPPointF();
}
//setting the offsets by the user
public void setOffset(float offsetX, float offsetY , float offsetX2 , float offsetY2) {
o1.offset.x = offsetX;
o1.offset.y = offsetY;
o2.offset.x = offsetX2;
o2.offset.y = offsetY2;
}
#Override
public MPPointF getOffset() { return o2.offset; }
public MPPointF getOffset2(){ return o2.offset; }
////////////////////////size//////////////////////////////
//setting the size by the user
public void setSize(FSize size , FSize size2) {
o1.size = size;
o2.size = size2;
}
//getting the size of the objects
public FSize getSize1() { return o1.size; }
public FSize getSize2() { return o2.size; }
//////////////////chart///////////////////////////////////
//setting the charts
public void setChartView(Chart chart,Chart chart2) {
o1.weakChart = new WeakReference<>(chart);
o2.weakChart = new WeakReference<>(chart2);
}
//getting chart
public Chart getChartView1() {return o1.weakChart == null ? null : o1.weakChart.get(); }
public Chart getChartView2() { return o2.weakChart == null ? null : o2.weakChart.get(); }
//getting offset
#Override
public MPPointF getOffsetForDrawingAtPoint(float posX, float posY) {
MPPointF offset = getOffset();
Chart chart = getChartView1();
float width1 = o1.size.width;
float height1 = o1.size.height;
if (width1==0.f){ width1 = o1.drawable.getIntrinsicWidth(); }
if (height1==0.f){ height1 = o1.drawable.getIntrinsicHeight(); }
MPPointF alaki = getOffsetForDrawingAtPoint2(posX,posY);
return o1.offset;
}
public MPPointF getOffsetForDrawingAtPoint2(float posx , float posY){
MPPointF offset = getOffset();
Chart chart = getChartView1();
float width1 = o2.size.width;
float height1 = o2.size.height;
if (width1==0.f){ width1 = o2.drawable.getIntrinsicWidth(); }
if (height1==0.f){ height1 = o2.drawable.getIntrinsicHeight(); }
return o2.offset;
}
#Override
public void refreshContent(Entry e, Highlight highlight) {
}
#Override
public void draw(Canvas canvas, float posX, float posY) {
Canvas canvas2 = canvas;
if (o1.drawable == null) return;
MPPointF offset = getOffsetForDrawingAtPoint(posX,posY); //main position
MPPointF offset2 = o2.offset; //main position obj 2
float width = o1.size.width;
float height = o1.size.height;
if (width == 0.f) { width = o1.drawable.getIntrinsicWidth(); }
if (height == 0.f) { height = o1.drawable.getIntrinsicHeight();}
float width2 = 128;//o2.size.width;
float height2 = 129;//o2.size.height;
if (width == 0.f) { width = o2.drawable.getIntrinsicWidth(); }
if (height == 0.f) { height = o2.drawable.getIntrinsicHeight();}
o1.drawable.copyBounds(o1.drawableBoundsCache);
o1.drawable.setBounds(
o1.drawableBoundsCache.left,
o1.drawableBoundsCache.top,
(int) (o1.drawableBoundsCache.left+width),
(int) (o1.drawableBoundsCache.top+height)
);
o2.drawable.copyBounds(o2.drawableBoundsCache);
o2.drawable.setBounds(
o2.drawableBoundsCache.left,
o2.drawableBoundsCache.top,
(int) (o2.drawableBoundsCache.left+width2),
(int) (o2.drawableBoundsCache.top+height2)
);
int saveId = canvas.save();
int saveId2 = canvas2.save();
canvas.translate(posX + offset.x , posY + offset.y);
o1.drawable.draw(canvas);
canvas2.translate( 75 , -45 );
o2.drawable.draw(canvas2);
canvas2.restoreToCount(saveId2);
canvas.restoreToCount(saveId);
o1.drawable.setBounds(o1.drawableBoundsCache);
o2.drawable.setBounds(o2.drawableBoundsCache);
}
}
public class ObjectImage {
public Drawable drawable;
public MPPointF offset = new MPPointF();
public WeakReference<Chart> weakChart;
public FSize size = new FSize();
public Rect drawableBoundsCache = new Rect();
}

Canvas Touch not working in S4 Android device

The wheel View (CircleView) is working fine in major of devices but this error coming from S4 and Note 3 devices.
The touch is getting deducted but the that not fall under the weidgetregion.
false - 1 has to be true - 1
Region Log is:
My Circle View code is
public class CircleView extends View implements OnTouchListener{
boolean firstTime = false;
private List<CircleViewBean> mMenuEntries = new ArrayList<CircleViewBean>();
private OnCellTouchListener mOnCellTouchListener = null;
public interface OnCellTouchListener {
public void onTouch(Wedge cell);
}
private Shader mShader;
private Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);
private float screen_density = getContext().getResources().getDisplayMetrics().density;
//Radius of inner ring size
private int mMinSize = scalePX(60);
//Radius of outer ring size
private int mMaxSize = scalePX(170);
private int mWedgeQty = 6;
//Center X location of Radial Menu
private int xPosition = scalePX(120);
//Center Y location of Radial Menu
private int yPosition = scalePX(120);
int touchIndex = -1;
private Wedge[] mWedges;
private RectF mViewRect = new RectF();
private int scalePX( int dp_size )
{
return (int) (dp_size * screen_density + 0.5f);
}
public CircleView(Context context) {
this(context, null);
}
public CircleView(Context context, AttributeSet attrs) {
super(context, attrs);
HashMap<String, String> device = Constants.getDeviceDetails(getResources().getDisplayMetrics().heightPixels, getResources().getDisplayMetrics().widthPixels);
mMinSize = Integer.parseInt(device.get("in_arc"));
mMaxSize = Integer.parseInt(device.get("out_arc"));
setBackgroundResource(R.drawable.centre_wheel);
}
private void determineWedges() {
int entriesQty = mMenuEntries.size();
if ( entriesQty > 0) {
mWedgeQty = entriesQty;
float degSlice = 360 / mWedgeQty;
float start_degSlice = 270 - (degSlice/2);
//calculates where to put the images
this.mWedges = new Wedge[mWedgeQty];
double mid = 0, min = 0, max = 0;
for(int i = 0; i < this.mWedges.length; i++) {
this.mWedges[i] = new Wedge(xPosition, yPosition, mMinSize, mMaxSize, (i
* degSlice)+start_degSlice, degSlice, mMenuEntries.get(i).getIndex());
mid = this.mWedges[i].midValue = normalizeAngle( ((i * degSlice) + start_degSlice + degSlice) / 2 );
min = normalizeAngle( (i * degSlice) + start_degSlice );
max = normalizeAngle( (i * degSlice) + start_degSlice + degSlice);
this.mWedges[i].minValue = min;
this.mWedges[i].midValue = mid;
this.mWedges[i].maxValue = max;
mViewRect.union( new RectF( mWedges[i].getWedgeRegion().getBounds() ) );
}
mShader = new RadialGradient(xPosition, yPosition, mMaxSize, new int[] { 0xff595756, 0xffCCC5C3, 0xf878280}, null, Shader.TileMode.MIRROR);
invalidate();
}
}
#Override
public void onDraw(Canvas canvas) {
if(!firstTime){
firstTime = true;
this.xPosition = (int) (getWidth()/2f);
this.yPosition = (int) (getHeight()/2f);
determineWedges();
}
canvas.scale(getWidth() / mViewRect.width(), getHeight() / mViewRect.width(), xPosition, yPosition);
//Saving the canvas and later restoring it so only this image will be rotated.
canvas.save(Canvas.MATRIX_SAVE_FLAG);
canvas.restore();
canvas.save();
canvas.restore();
mPaint.setShader( mShader );
}
private double normalizeAngle(double angle) {
if(angle >= 0) {
while( angle > 360 ) {
angle -= 360;
}
}
else {
while( angle < -360) {
angle += 360;
}
}
return angle;
}
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// TODO Auto-generated method stub
int wmode = MeasureSpec.getMode(widthMeasureSpec);
int hmode = MeasureSpec.getMode(heightMeasureSpec);
int wsize = MeasureSpec.getSize(widthMeasureSpec);
int hsize = MeasureSpec.getSize(heightMeasureSpec);
int width = (int)mViewRect.width();
int height = (int) mViewRect.height();
if (wmode == MeasureSpec.EXACTLY) {
width = wsize;
}
if (hmode == MeasureSpec.EXACTLY) {
height = hsize;
}
this.setMeasuredDimension(width, height);
invalidate();
}
public class Wedge extends Path {
private int x, y;
private int InnerSize, OuterSize;
private float StartArc;
private float ArcWidth;
private Region mWedgeRegion;
private int index=0;
public double minValue;
public double midValue;
public double maxValue;
private Wedge(int x, int y, int InnerSize, int OuterSize, float StartArc, float ArcWidth, int category) {
super();
this.index = category;
if (StartArc >= 360) {
StartArc = StartArc-360;
}
minValue = midValue = maxValue = 0;
mWedgeRegion = new Region();
this.x = x; this.y = y;
this.InnerSize = InnerSize;
this.OuterSize = OuterSize;
this.StartArc = StartArc;
this.ArcWidth = ArcWidth;
this.buildPath();
}
public int getCategoryIndex(){
return this.index;
}
public String toString() {
return minValue + " " + midValue + " " + maxValue;
}
/**
*
* #return the bottom rect that will be used for intersection
*/
public Region getWedgeRegion() {
return mWedgeRegion;
}
private void buildPath() {
final RectF rect = new RectF();
final RectF rect2 = new RectF();
//Rectangles values
rect.set(this.x-this.InnerSize, this.y-this.InnerSize, this.x+this.InnerSize, this.y+this.InnerSize);
rect2.set(this.x-this.OuterSize, this.y-this.OuterSize, this.x+this.OuterSize, this.y+this.OuterSize);
this.reset();
//this.moveTo(100, 100);
this.arcTo(rect2, StartArc, ArcWidth);
this.arcTo(rect, StartArc+ArcWidth, -ArcWidth);
this.close();
mWedgeRegion.setPath( this, new Region(0,0,480,800) );
}
}
public boolean addMenuEntry(CircleViewBean menuEntry) {
mMenuEntries.add(menuEntry);
return true;
}
#Override
public boolean onTouchEvent(MotionEvent event) {
if(event.getAction() == MotionEvent.ACTION_UP){
if(mOnCellTouchListener!=null && touchIndex >-1){
int i=0;
for(Wedge day : mWedges) {
if(day.getWedgeRegion().getBounds().contains((int)event.getX(), (int)event.getY()) && touchIndex==i) {
mOnCellTouchListener.onTouch(mWedges[touchIndex]);
break;
}
i++;
}
}
}else if(event.getAction() == MotionEvent.ACTION_DOWN || event.getAction() == MotionEvent.ACTION_MOVE){
int i=0;
for(Wedge day : mWedges) {
if(day.getWedgeRegion().getBounds().contains((int)event.getX(), (int)event.getY())) {
touchIndex = i;
setBackgroundResource(mMenuEntries.get(touchIndex).getIcon());
}
i++;
}
}
return true;
}
public void setOnCellTouchListener(OnCellTouchListener p) {
mOnCellTouchListener = p;
}
public boolean onTouch(View v, MotionEvent event) {
return false;
}
}

First of all, look at line 307. Learn how to read crash logs because it says exactly on what line the crash is, and then it shouldn't be too hard too determine what is wrong.
Not knowing what line it is I guess that mWedges might be null. in the onTouch you do for(Wedge day : mWedges) but it is not guaranteed that is isn't null there. You should check before you do that if it is null.
You put it to a non null value in determineWedges but only when there is at least 1 mMenuEntries. So when there are no entries when you do an onTouch it will crash.

At last i found my mistake in this code that it is working in mdpi and htpi and not in xxhdpi the reason is
mWedgeRegion.setPath( this, new Region(0,0,480,800) );
The bound exceeds the circle size, i mean the xxhdpi draws an circle with 1000x1000 values, so i made this too like this (max values)
mWedgeRegion.setPath( this, new Region(0,0,720,1200) )

getting android. view.inflateException when I use zoomView for pageCurlView

please tell me how can i remove the exception. or give me idea to implement zoom view with curlview.....
my xml file is like this,
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/relat">
<com.example.image.ZoomView
>
<com.example.image.PageCurlView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/dcgpagecurlPageCurlView1"
>
</com.example.image.PageCurlView>
my java file is
package com.example.image;
public class StandaloneExample extends Activity {
Button bt;LinearLayout lr;
/** Decoded bitmap image */
private Bitmap mBitmap;
private ZoomView zoomview;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.standalone_example);
View v1 = ((LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE)).inflate(R.layout.standalone_example, null, false);
v1.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
zoomview.addView(v1);
lr = (LinearLayout) findViewById(R.id.relat);
lr.addView(zoomview);
}
#Override
public void onDestroy(){
super.onDestroy();
System.gc();
finish();
}
public void lockOrientationLandscape() {
lockOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
}
public void lockOrientationPortrait() {
lockOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
}
public void lockOrientation( int orientation ) {
setRequestedOrientation(orientation);
}
}
i have implemented zoomView.java as described in a link
pagecurlview.java class is
public class PageCurlView extends View {
private final static String TAG = "PageCurlView";
private Paint mTextPaint;
private TextPaint mTextPaintShadow;
private int mCurlSpeed;
private int mUpdateRate;
private int mInitialEdgeOffset;
private int mCurlMode;
public static final int CURLMODE_SIMPLE = 0;
public static final int CURLMODE_DYNAMIC = 1;
private boolean bEnableDebugMode = false;
private WeakReference<Context> mContext;
private FlipAnimationHandler mAnimationHandler;
private float mFlipRadius;
private Vector2D mMovement;
private Vector2D mFinger;
private Vector2D mOldMovement;
private Paint mCurlEdgePaint;
private Vector2D mA, mB, mC, mD, mE, mF, mOldF, mOrigin;
private int mCurrentLeft, mCurrentTop;
private boolean bViewDrawn;
private boolean bFlipRight;
private boolean bFlipping;
private boolean bUserMoves;
private boolean bBlockTouchInput = false;
private boolean bEnableInputAfterDraw = false;
private Bitmap mForeground;
private Bitmap mBackground;
private ArrayList<Bitmap> mPages;
private int mIndex = 0;
private class Vector2D
{
public float x,y;
public Vector2D(float x, float y)
{
this.x = x;
this.y = y;
}
#Override
public String toString() {
// TODO Auto-generated method stub
return "("+this.x+","+this.y+")";
}
public float length() {
return (float) Math.sqrt(x * x + y * y);
}
public float lengthSquared() {
return (x * x) + (y * y);
}
public boolean equals(Object o) {
if (o instanceof Vector2D) {
Vector2D p = (Vector2D) o;
return p.x == x && p.y == y;
}
return false;
}
public Vector2D reverse() {
return new Vector2D(-x,-y);
}
public Vector2D sum(Vector2D b) {
return new Vector2D(x+b.x,y+b.y);
}
public Vector2D sub(Vector2D b) {
return new Vector2D(x-b.x,y-b.y);
}
public float dot(Vector2D vec) {
return (x * vec.x) + (y * vec.y);
}
public float cross(Vector2D a, Vector2D b) {
return a.cross(b);
}
public float cross(Vector2D vec) {
return x * vec.y - y * vec.x;
}
public float distanceSquared(Vector2D other) {
float dx = other.x - x;
float dy = other.y - y;
return (dx * dx) + (dy * dy);
}
public float distance(Vector2D other) {
return (float) Math.sqrt(distanceSquared(other));
}
public float dotProduct(Vector2D other) {
return other.x * x + other.y * y;
}
public Vector2D normalize() {
float magnitude = (float) Math.sqrt(dotProduct(this));
return new Vector2D(x / magnitude, y / magnitude);
}
public Vector2D mult(float scalar) {
return new Vector2D(x*scalar,y*scalar);
}
}
class FlipAnimationHandler extends Handler {
#Override
public void handleMessage(Message msg) {
PageCurlView.this.FlipAnimationStep();
}
public void sleep(long millis) {
this.removeMessages(0);
sendMessageDelayed(obtainMessage(0), millis);
}
}
public PageCurlView(Context context) {
super(context);
init(context);
ResetClipEdge();
}
public PageCurlView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
// Get the data from the XML AttributeSet
{
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.PageCurlView);
// Get data
bEnableDebugMode = a.getBoolean(R.styleable.PageCurlView_enableDebugMode, bEnableDebugMode);
mCurlSpeed = a.getInt(R.styleable.PageCurlView_curlSpeed, mCurlSpeed);
mUpdateRate = a.getInt(R.styleable.PageCurlView_updateRate, mUpdateRate);
mInitialEdgeOffset = a.getInt(R.styleable.PageCurlView_initialEdgeOffset, mInitialEdgeOffset);
mCurlMode = a.getInt(R.styleable.PageCurlView_curlMode, mCurlMode);
Log.i(TAG, "mCurlSpeed: " + mCurlSpeed);
Log.i(TAG, "mUpdateRate: " + mUpdateRate);
Log.i(TAG, "mInitialEdgeOffset: " + mInitialEdgeOffset);
Log.i(TAG, "mCurlMode: " + mCurlMode);
// recycle object (so it can be used by others)
a.recycle();
}
ResetClipEdge();
}
private final void init(Context context) {
// Foreground text paint
mTextPaint = new Paint();
mTextPaint.setAntiAlias(true);
mTextPaint.setTextSize(16);
mTextPaint.setColor(0xFF000000);
// The shadow
mTextPaintShadow = new TextPaint();
mTextPaintShadow.setAntiAlias(true);
mTextPaintShadow.setTextSize(16);
mTextPaintShadow.setColor(0x00000000);
// Cache the context
mContext = new WeakReference<Context>(context);
// Base padding
setPadding(3, 3, 3, 3);
// The focus flags are needed
setFocusable(true);
setFocusableInTouchMode(true);
mMovement = new Vector2D(0,0);
mFinger = new Vector2D(0,0);
mOldMovement = new Vector2D(0,0);
// Create our curl animation handler
mAnimationHandler = new FlipAnimationHandler();
// Create our edge paint
mCurlEdgePaint = new Paint();
mCurlEdgePaint.setColor(Color.WHITE);
mCurlEdgePaint.setAntiAlias(true);
mCurlEdgePaint.setStyle(Paint.Style.FILL);
mCurlEdgePaint.setShadowLayer(10, -5, 5, 0x99000000);
// Set the default props, those come from an XML :D
mCurlSpeed = 30;
mUpdateRate = 33;
mInitialEdgeOffset = 20;
mCurlMode = 1;
// LEGACY PAGE HANDLING!
// Create pages
mPages = new ArrayList<Bitmap>();
mPages.add(BitmapFactory.decodeResource(getResources(), R.drawable.princess));
mPages.add(BitmapFactory.decodeResource(getResources(), R.drawable.temp));
// Create some sample images
mForeground = mPages.get(0);
mBackground = mPages.get(1);
}
public void ResetClipEdge()
{
// Set our base movement
mMovement.x = mInitialEdgeOffset;
mMovement.y = mInitialEdgeOffset;
mOldMovement.x = 0;
mOldMovement.y = 0;
// Now set the points
// TODO: OK, those points MUST come from our measures and
// the actual bounds of the view!
mA = new Vector2D(mInitialEdgeOffset, 0);
mB = new Vector2D(this.getWidth(), this.getHeight());
mC = new Vector2D(this.getWidth(), 0);
mD = new Vector2D(0, 0);
mE = new Vector2D(0, 0);
mF = new Vector2D(0, 0);
mOldF = new Vector2D(0, 0);
// The movement origin point
mOrigin = new Vector2D(this.getWidth(), 0);
}
private Context GetContext() {
return mContext.get();
}
public boolean IsCurlModeDynamic()
{
return mCurlMode == CURLMODE_DYNAMIC;
}
public void SetCurlSpeed(int curlSpeed)
{
if ( curlSpeed < 1 )
throw new IllegalArgumentException("curlSpeed must be greated than 0");
mCurlSpeed = curlSpeed;
}
public int GetCurlSpeed()
{
return mCurlSpeed;
}
public void SetUpdateRate(int updateRate)
{
if ( updateRate < 1 )
throw new IllegalArgumentException("updateRate must be greated than 0");
mUpdateRate = updateRate;
}
public int GetUpdateRate()
{
return mUpdateRate;
}
public void SetInitialEdgeOffset(int initialEdgeOffset)
{
if ( initialEdgeOffset < 0 )
throw new IllegalArgumentException("initialEdgeOffset can not negative");
mInitialEdgeOffset = initialEdgeOffset;
}
public int GetInitialEdgeOffset()
{
return mInitialEdgeOffset;
}
public void SetCurlMode(int curlMode)
{
if ( curlMode != CURLMODE_SIMPLE &&
curlMode != CURLMODE_DYNAMIC )
throw new IllegalArgumentException("Invalid curlMode");
mCurlMode = curlMode;
}
public int GetCurlMode()
{
return mCurlMode;
}
public void SetEnableDebugMode(boolean bFlag)
{
bEnableDebugMode = bFlag;
}
public boolean IsDebugModeEnabled()
{
return bEnableDebugMode;
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int finalWidth, finalHeight;
finalWidth = measureWidth(widthMeasureSpec);
finalHeight = measureHeight(heightMeasureSpec);
setMeasuredDimension(finalWidth, finalHeight);
}
private int measureWidth(int measureSpec) {
int result = 0;
int specMode = MeasureSpec.getMode(measureSpec);
int specSize = MeasureSpec.getSize(measureSpec);
if (specMode == MeasureSpec.EXACTLY) {
// We were told how big to be
result = specSize;
} else {
// Measure the text
result = specSize;
}
return result;
}
private int measureHeight(int measureSpec) {
int result = 0;
int specMode = MeasureSpec.getMode(measureSpec);
int specSize = MeasureSpec.getSize(measureSpec);
if (specMode == MeasureSpec.EXACTLY) {
// We were told how big to be
result = specSize;
} else {
// Measure the text (beware: ascent is a negative number)
result = specSize;
}
return result;
}
#Override
public boolean onTouchEvent(MotionEvent event) {
if (!bBlockTouchInput) {
// Get our finger position
mFinger.x = event.getX();
mFinger.y = event.getY();
int width = getWidth();
// Depending on the action do what we need to
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
mOldMovement.x = mFinger.x;
mOldMovement.y = mFinger.y;
// If we moved over the half of the display flip to next
if (mOldMovement.x > (width >> 1)) {
mMovement.x = mInitialEdgeOffset;
mMovement.y = mInitialEdgeOffset;
// Set the right movement flag
bFlipRight = true;
} else {
// Set the left movement flag
bFlipRight = false;
// go to next previous page
previousView();
// Set new movement
mMovement.x = IsCurlModeDynamic()?width<<1:width;
mMovement.y = mInitialEdgeOffset;
}
break;
case MotionEvent.ACTION_UP:
bUserMoves=false;
bFlipping=true;
FlipAnimationStep();
break;
case MotionEvent.ACTION_MOVE:
bUserMoves=true;
// Get movement
mMovement.x -= mFinger.x - mOldMovement.x;
mMovement.y -= mFinger.y - mOldMovement.y;
mMovement = CapMovement(mMovement, true);
// Make sure the y value get's locked at a nice level
if ( mMovement.y <= 1 )
mMovement.y = 1;
// Get movement direction
if (mFinger.x < mOldMovement.x ) {
bFlipRight = true;
} else {
bFlipRight = false;
}
// Save old movement values
mOldMovement.x = mFinger.x;
mOldMovement.y = mFinger.y;
// Force a new draw call
DoPageCurl();
this.invalidate();
break;
}
}
// TODO: Only consume event if we need to.
return true;
}
private Vector2D CapMovement(Vector2D point, boolean bMaintainMoveDir)
{
// Make sure we never ever move too much
if (point.distance(mOrigin) > mFlipRadius)
{
if ( bMaintainMoveDir )
{
// Maintain the direction
point = mOrigin.sum(point.sub(mOrigin).normalize().mult(mFlipRadius));
}
else
{
// Change direction
if ( point.x > (mOrigin.x+mFlipRadius))
point.x = (mOrigin.x+mFlipRadius);
else if ( point.x < (mOrigin.x-mFlipRadius) )
point.x = (mOrigin.x-mFlipRadius);
point.y = (float) (Math.sin(Math.acos(Math.abs(point.x-mOrigin.x)/mFlipRadius))*mFlipRadius);
}
}
return point;
}
public void FlipAnimationStep() {
if ( !bFlipping )
return;
int width = getWidth();
// No input when flipping
bBlockTouchInput = true;
// Handle speed
float curlSpeed = mCurlSpeed;
if ( !bFlipRight )
curlSpeed *= -1;
// Move us
mMovement.x += curlSpeed;
mMovement = CapMovement(mMovement, false);
// Create values
DoPageCurl();
// Check for endings :D
if (mA.x < 1 || mA.x > width - 1) {
bFlipping = false;
if (bFlipRight) {
//SwapViews();
nextView();
}
ResetClipEdge();
// Create values
DoPageCurl();
// Enable touch input after the next draw event
bEnableInputAfterDraw = true;
}
else
{
mAnimationHandler.sleep(mUpdateRate);
}
// Force a new draw call
this.invalidate();
}
private void DoPageCurl()
{
if(bFlipping){
if ( IsCurlModeDynamic() )
doDynamicCurl();
else
doSimpleCurl();
} else {
if ( IsCurlModeDynamic() )
doDynamicCurl();
else
doSimpleCurl();
}
}
private void doSimpleCurl() {
int width = getWidth();
int height = getHeight();
// Calculate point A
mA.x = width - mMovement.x;
mA.y = height;
// Calculate point D
mD.x = 0;
mD.y = 0;
if (mA.x > width / 2) {
mD.x = width;
mD.y = height - (width - mA.x) * height / mA.x;
} else {
mD.x = 2 * mA.x;
mD.y = 0;
}
double angle = Math.atan((height - mD.y) / (mD.x + mMovement.x - width));
double _cos = Math.cos(2 * angle);
double _sin = Math.sin(2 * angle);
mF.x = (float) (width - mMovement.x + _cos * mMovement.x);
mF.y = (float) (height - _sin * mMovement.x);
// If the x position of A is above half of the page we are still not
// folding the upper-right edge and so E and D are equal.
if (mA.x > width / 2) {
mE.x = mD.x;
mE.y = mD.y;
}
else
{
// So get E
mE.x = (float) (mD.x + _cos * (width - mD.x));
mE.y = (float) -(_sin * (width - mD.x));
}
}
private void doDynamicCurl() {
int width = getWidth();
int height = getHeight();
mF.x = width - mMovement.x+0.1f;
mF.y = height - mMovement.y+0.1f;
if(mA.x==0) {
mF.x= Math.min(mF.x, mOldF.x);
mF.y= Math.max(mF.y, mOldF.y);
}
// Get diffs
float deltaX = width-mF.x;
float deltaY = height-mF.y;
float BH = (float) (Math.sqrt(deltaX * deltaX + deltaY * deltaY) / 2);
double tangAlpha = deltaY / deltaX;
double alpha = Math.atan(deltaY / deltaX);
double _cos = Math.cos(alpha);
double _sin = Math.sin(alpha);
mA.x = (float) (width - (BH / _cos));
mA.y = height;
mD.y = (float) (height - (BH / _sin));
mD.x = width;
mA.x = Math.max(0,mA.x);
if(mA.x==0) {
mOldF.x = mF.x;
mOldF.y = mF.y;
}
// Get W
mE.x = mD.x;
mE.y = mD.y;
// Correct
if (mD.y < 0) {
mD.x = width + (float) (tangAlpha * mD.y);
mE.y = 0;
mE.x = width + (float) (Math.tan(2 * alpha) * mD.y);
}
}
#Deprecated
private void SwapViews() {
Bitmap temp = mForeground;
mForeground = mBackground;
mBackground = temp;
}
private void nextView() {
int foreIndex = mIndex + 1;
if(foreIndex >= mPages.size()) {
foreIndex = 0;
}
int backIndex = foreIndex + 1;
if(backIndex >= mPages.size()) {
backIndex = 0;
}
mIndex = foreIndex;
setViews(foreIndex, backIndex);
}
private void previousView() {
int backIndex = mIndex;
int foreIndex = backIndex - 1;
if(foreIndex < 0) {
foreIndex = mPages.size()-1;
}
mIndex = foreIndex;
setViews(foreIndex, backIndex);
}
private void setViews(int foreground, int background) {
mForeground = mPages.get(foreground);
mBackground = mPages.get(background);
}
#Override
protected void onDraw(Canvas canvas) {
mCurrentLeft = getLeft();
mCurrentTop = getTop();
if ( !bViewDrawn ) {
bViewDrawn = true;
onFirstDrawEvent(canvas);
}
canvas.drawColor(Color.WHITE);
Rect rect = new Rect();
rect.left = 0;
rect.top = 0;
rect.bottom = getHeight();
rect.right = getWidth();
// First Page render
Paint paint = new Paint();
// Draw our elements
drawForeground(canvas, rect, paint);
drawBackground(canvas, rect, paint);
drawCurlEdge(canvas);
// Draw any debug info once we are done
if ( bEnableDebugMode )
drawDebug(canvas);
// Check if we can re-enable input
if ( bEnableInputAfterDraw )
{
bBlockTouchInput = false;
bEnableInputAfterDraw = false;
}
// Restore canvas
//canvas.restore();
}
protected void onFirstDrawEvent(Canvas canvas) {
mFlipRadius = getWidth();
ResetClipEdge();
DoPageCurl();
}
private void drawForeground( Canvas canvas, Rect rect, Paint paint ) {
canvas.drawBitmap(mForeground, null, rect, paint);
// Draw the page number (first page is 1 in real life :D
// there is no page number 0 hehe)
drawPageNum(canvas, mIndex);
}
private Path createBackgroundPath() {
Path path = new Path();
path.moveTo(mA.x, mA.y);
path.lineTo(mB.x, mB.y);
path.lineTo(mC.x, mC.y);
path.lineTo(mD.x, mD.y);
path.lineTo(mA.x, mA.y);
return path;
}
private void drawBackground( Canvas canvas, Rect rect, Paint paint ) {
Path mask = createBackgroundPath();
// Save current canvas so we do not mess it up
canvas.save();
canvas.clipPath(mask);
canvas.drawBitmap(mBackground, null, rect, paint);
// Draw the page number (first page is 1 in real life :D
// there is no page number 0 hehe)
drawPageNum(canvas, mIndex);
canvas.restore();
}
private Path createCurlEdgePath() {
Path path = new Path();
path.moveTo(mA.x, mA.y);
path.lineTo(mD.x, mD.y);
path.lineTo(mE.x, mE.y);
path.lineTo(mF.x, mF.y);
path.lineTo(mA.x, mA.y);
return path;
}
private void drawCurlEdge( Canvas canvas )
{
Path path = createCurlEdgePath();
canvas.drawPath(path, mCurlEdgePaint);
}
private void drawPageNum(Canvas canvas, int pageNum)
{
mTextPaint.setColor(Color.WHITE);
String pageNumText = "- "+pageNum+" -";
drawCentered(canvas, pageNumText,canvas.getHeight()-mTextPaint.getTextSize()-5,mTextPaint,mTextPaintShadow);
}
public static void drawTextShadowed(Canvas canvas, String text, float x, float y, Paint textPain, Paint shadowPaint) {
canvas.drawText(text, x-1, y, shadowPaint);
canvas.drawText(text, x, y+1, shadowPaint);
canvas.drawText(text, x+1, y, shadowPaint);
canvas.drawText(text, x, y-1, shadowPaint);
canvas.drawText(text, x, y, textPain);
}
public static void drawCentered(Canvas canvas, String text, float y, Paint textPain, Paint shadowPaint)
{
float posx = (canvas.getWidth() - textPain.measureText(text))/2;
drawTextShadowed(canvas, text, posx, y, textPain, shadowPaint);
}
private void drawDebug(Canvas canvas)
{
float posX = 10;
float posY = 20;
Paint paint = new Paint();
paint.setStrokeWidth(5);
paint.setStyle(Style.STROKE);
paint.setColor(Color.BLACK);
canvas.drawCircle(mOrigin.x, mOrigin.y, getWidth(), paint);
paint.setStrokeWidth(3);
paint.setColor(Color.RED);
canvas.drawCircle(mOrigin.x, mOrigin.y, getWidth(), paint);
paint.setStrokeWidth(5);
paint.setColor(Color.BLACK);
canvas.drawLine(mOrigin.x, mOrigin.y, mMovement.x, mMovement.y, paint);
paint.setStrokeWidth(3);
paint.setColor(Color.RED);
canvas.drawLine(mOrigin.x, mOrigin.y, mMovement.x, mMovement.y, paint);
posY = debugDrawPoint(canvas,"A",mA,Color.RED,posX,posY);
posY = debugDrawPoint(canvas,"B",mB,Color.GREEN,posX,posY);
posY = debugDrawPoint(canvas,"C",mC,Color.BLUE,posX,posY);
posY = debugDrawPoint(canvas,"D",mD,Color.CYAN,posX,posY);
posY = debugDrawPoint(canvas,"E",mE,Color.YELLOW,posX,posY);
posY = debugDrawPoint(canvas,"F",mF,Color.LTGRAY,posX,posY);
posY = debugDrawPoint(canvas,"Mov",mMovement,Color.DKGRAY,posX,posY);
posY = debugDrawPoint(canvas,"Origin",mOrigin,Color.MAGENTA,posX,posY);
posY = debugDrawPoint(canvas,"Finger",mFinger,Color.GREEN,posX,posY);
}
private float debugDrawPoint(Canvas canvas, String name, Vector2D point, int color, float posX, float posY) {
return debugDrawPoint(canvas,name+" "+point.toString(),point.x, point.y, color, posX, posY);
}
private float debugDrawPoint(Canvas canvas, String name, float X, float Y, int color, float posX, float posY) {
mTextPaint.setColor(color);
drawTextShadowed(canvas,name,posX , posY, mTextPaint,mTextPaintShadow);
Paint paint = new Paint();
paint.setStrokeWidth(5);
paint.setColor(color);
canvas.drawPoint(X, Y, paint);
return posY+15;
}
}

Ontouch() isn't work with custom view?

I have a class it extends "View" and Implement "OnTouchListener" so it's will override ontouch method automatically but this method not work. I try to debug by put breakpoint in this method but it isn't called.
I try to this problem from another forums. they tell that onTouch() must return true; But it's not better.
my class problem :
public class Viewer extends View implements OnTouchListener{
/** Constant tile width. */
public static final int TILEW = 32;
/** Constant tile height. */
public static final int TILEH = 70;
/** Constant tile shift due to increased level. */
public static final int TILESKEW = 7;
/** Tile images. */
private Bitmap[][] tileImages;
/** Highlighted tile images. */
private Bitmap[][] tileImagesHL;
/** Board itself. */
private Board b;
private Tile[][][] tTile;
private float screenWidth = Defines.getScreenWidth();
private float screenHeight = Defines.getScreenHeight();
private float offsetImg = Defines.getOffsetImage();
private float reScalePosX = Defines.getReScalePosX();
private float reScalePosY = Defines.getReScalePosY();
private boolean firstIter;
/** Stores selected tiles */
private ArrayList<Tile> selectedTiles;// = new ArrayList<Tile>();
/** Stores highlighted tiles by Hint */
private ArrayList<Tile> highlightedTiles;// = new ArrayList<Tile>();
//////////////////////////////////////////////////
private static RectF screen;
private Images imgObj;
public Viewer(Context context) {
super(context);
// TODO Auto-generated constructor stub
imgObj = new Images(context);
b = new MainActivity().board;
Defines.setScreenRender(1280, 800);
makeTileImages(Board.MAXGROUPS);
}
#Override
protected void onDraw(Canvas canvas){
drawBackGround(imgObj.bg01, canvas);
try{
tTile = b.getContent();
if(tTile==null || tileImages==null){
return;
}
drawTile(tTile, canvas);
}catch (Exception e) {
// TODO: handle exception
}
}
#Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
Log.d("Mydebug", "YEHHHHHH");
Tile[][][] content = b.getContent();
for (int i = 0; i < content.length; i++) {
for (int y = 0; y < content[i].length; y++) {
for (int x = 0; x < content[i][y].length; x++) {
processMouseClick(content, i, y , x, event);
}
}
}
return true;
}
public void drawBackGround(Bitmap bitmapBG,Canvas canvas){
screen = new RectF(0.0f, 0.0f, Defines.getScreenWidth(),Defines.getScreenHeight());
canvas.drawBitmap(bitmapBG, null, screen, null);
}
private void makeTileImages(int groups){
tileImages = loadTileset(groups, "unlit_");
tileImagesHL = loadTileset(groups, "lit_");
}
private Bitmap[][] loadTileset(int groups,String prefix){
Bitmap[][] tr = new Bitmap[groups][Board.GROUPSIZE];
try{
InputStream is = this.getResources().getAssets().open("Tiles/tiles.set");
BufferedReader f = new BufferedReader(new InputStreamReader(is));
String s = f.readLine();
while (s!=null) {
if (!s.startsWith("#")) {
String[] tokens = s.split(" ");
try{
int groupNum =Integer.parseInt(tokens[0]);
for(int i =1; i<=(Board.GROUPSIZE);i++){
String pathPNG = "Tiles/"+prefix+tokens[i]+".png";
Bitmap img = imgObj.loadImage(pathPNG);
img = imgObj.resizeBitmap(img,Tile.tileHeight, Tile.tileWidth);
//Bitmap img = loadImage(pathPNG);
//Log.d("Mydebug", "PATH:"+pathPNG);
tr[groupNum][i-1] = img;
}
}catch (Exception e) {
// TODO: handle exception
Log.d("Mydebug", "File error TIles/tile.set");
}
}
s = f.readLine();
}
}catch (Exception e) {
// TODO: handle exception
}
return tr;
}
public void drawTile(Tile[][][] content,Canvas canvas){
for (int i = 0; i < content.length; i++) {
for (int y = 0; y < content[i].length; y++) {
for (int x = 0; x < content[i][y].length; x++) {
final Tile t = content[i][y][x];
if (t != null) {
if (y>0 && content[i][y-1][x]!=null && t.equals(content[i][y-1][x])) {
continue;
}
if (x>0 && content[i][y][x-1]!=null && t.equals(content[i][y][x-1])) {
continue;
}
Bitmap image = tileImages[t.getValue()][t.getSubindex()];
if (b.free(t)) {
image = tileImagesHL[t.getValue()][t.getSubindex()];
}
/* Draw tile images to panel */
//canvas.drawBitmap(image, x*TILEW+TILEW/2+i*TILESKEW, (y+1)*TILEH/2-i*TILESKEW, null);
canvas.drawBitmap(image, (x*TILEW+TILEW/2+i*TILESKEW)+200, ((y+1)*TILEH/2-i*TILESKEW)+100, null);
}
}
}
}
}
/** A helper function for the Viewer constructor which accompanies the mouseListener object on each tiles
* #param content The current board's 3D array of positions
* #param i The current tile's x position
* #param y The current tile's y position
* #param x The current tile's z position
* #param me The mouseEvent for each tile
*/
private void processMouseClick(Tile[][][] content, int i, int y, int x, MotionEvent touchPos){
final Tile t = content[i][y][x];
if (t != null) {
if (y>0 && content[i][y-1][x]!=null && t.equals(content[i][y-1][x])) {
return;
}
if (x>0 && content[i][y][x-1]!=null && t.equals(content[i][y][x-1])) {
return;
}
Bitmap image = tileImages[t.getValue()][t.getSubindex()];
if (b.free(t)) {
image = tileImagesHL[t.getValue()][t.getSubindex()];
}
// Rectangle representing space of tile
final Rect rect = new Rect(x*TILEW+TILEW/2+i*TILESKEW, (y+1)*TILEH/2-i*TILESKEW, image.getWidth(), image.getHeight());
//if ((rect.contains(me.getPoint())) && b.free(t) && t.isVisible()) {
if ((rect.contains((int)touchPos.getX(), (int)touchPos.getY()) && b.free(t))){
t.wasClicked = true;
firstIter = false;
Log.d("MyDebug", "Clicked ME");
//if (content[i][y][x].isVisible()){
//Add corresponding JLabel to panel
// t.tLabel.setBounds(x*TILEW+TILEW/2+i*TILESKEW, (y+1)*TILEH/2-i*TILESKEW, image.getWidth(null), image.getHeight(null));
// t.tLabel.setVisible(false);
// t.tLabel.setBorder(BorderFactory.createLineBorder(Color.blue, 2));
//}
//validClick(t);
}
}
}
}

remove implements OnTouchListener and override the method:
public boolean onTouch(MotionEvent event)
update
of course it's onTouchEvent, not onTouch

how to bound set of points (custom shape) and touch event on it android

i am able to get my bitmap set of points (as an array) using this link
now my question is how can i bound these points as shape/region. Means when user touched on area of my bounded points, i want to move objects(shape) according to that. Above link return points of colored bitmap (it remove transparent part), only colored part points are return as an array.
This is what my code :
1) CustomSahpe.java
public class CustomShape {
private final Context context;
Bitmap bitmap;
int width, height;
int[] pixels;
private final ArrayList<Point> points = new ArrayList<Point>();
public CustomShape(Context context) {
// TODO Auto-generated constructor stub
// super(context);
this.context = context;
bitmap = BitmapFactory.decodeResource(context.getResources(),
R.drawable.ic_menu_balloon);
width = bitmap.getWidth();
height = bitmap.getHeight();
pixels = new int[width * height];
bitmap.getPixels(pixels, 0, width, 0, 0, width, height);
getActualBitmap();
}
public ArrayList<Point> getPoints(){
return points;
}
public void getActualBitmap() {
for (int x = 0; x < width; x+=2) {
int firstY = -1, lastY = -1;
for (int y = 0; y < height; y+=2) {
boolean transparent = (pixels[y * width + x] == Color.TRANSPARENT);
if (!transparent) {
if (firstY == -1) {
firstY = y;
}
lastY = y;
}
}
if (firstY != -1) {
points.add(new Point(x, firstY));
points.add(new Point(x, lastY));
}
}
}
}
2) MyShapre.java
class MyShape{
CustomShape customShape ;
Point points[];
private int x, y;
Path path = new Path();
public MyShape(Context context) {
customShape = new CustomShape(ScaleTestActivity.this);
points = new Point[customShape.getPoints().size()];
for(int i=0;i<customShape.getPoints().size();i++){
points[i] = new Point();
points[i] = customShape.getPoints().get(i);
}
}
public Path getPath(){
return path;
}
public void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
Paint paint = new Paint();
paint.setColor(Color.WHITE);
for(int i =0 ;i<points.length;i++){
Point point = new Point(points[i].x + getX(), points[i].y + getY());
path.lineTo(points[i].x, points[i].y);
canvas.drawPoint(point.x,point.y,paint);
}
}
public void setX(int x) {
this.x = x;
}
public int getX() {
return x;
}
public void setY(int y) {
this.y = y;
}
public int getY() {
return y;
}
}
}
3) MainPanel.java
class MainPanel extends View{
Context context;
MyShape myShape;
boolean flag = false;
public MainPanel(Context context) {
super(context);
this.context = context;
myShape = new MyShape(context);
}
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawColor(Color.RED);
myShape.onDraw(canvas);
}
#Override
public boolean onTouchEvent(MotionEvent event) {
// TODO Auto-generated method stub
int x,y;
x = (int)event.getX();
y = (int)event.getY();
Point point = new Point(x, y);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
myShape.setX(x);
myShape.setY(y);
RectF rectF = new RectF();
Path path = myShape.getPath();
path.computeBounds(rectF, true);
Region region = new Region();
region.setPath(path, new Region((int) rectF.left, (int) rectF.top, (int) rectF.right, (int) rectF.bottom));
if(region.contains(x,y)){
flag = true;
Log.i("System out","onDown");
}
break;
case MotionEvent.ACTION_MOVE:
Log.i("System out","onMove : "+flag);
if(flag){
myShape.setX(x);
myShape.setY(y);
Log.i("System out","onMove");
}
break;
case MotionEvent.ACTION_UP:
// myShape.setX(x);
// myShape.setY(y);
flag = false;
Log.i("System out","onUp");
break;
default:
break;
}
invalidate();
return true;
}
}
4) ScaleTestActivity.java
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new MainPanel(this));
}

I use a Polygon class to detect touches on rotated bitmaps. It's based mostly on information and code from this site http://alienryderflex.com/polygon/. This should work with your code.
public class Polygon {
// Polygon coodinates.
private final int[] polyY, polyX;
// Number of sides in the polygon.
private final int polySides;
/**
* Default constructor.
* #param px Polygon y coods.
* #param py Polygon x coods.
* #param ps Polygon sides count.
*/
public Polygon( final int[] px, final int[] py, final int ps ) {
polyX = px;
polyY = py;
polySides = ps;
}
/**
* Checks if the Polygon contains a point.
* #see "http://alienryderflex.com/polygon/"
* #param x Point horizontal pos.
* #param y Point vertical pos.
* #return Point is in Poly flag.
*/
public boolean contains( final float x, final float y ) {
boolean oddTransitions = false;
for( int i = 0, j = polySides -1; i < polySides; j = i++ ) {
if( ( polyY[ i ] < y && polyY[ j ] >= y ) || ( polyY[ j ] < y && polyY[ i ] >= y ) ) {
if( polyX[ i ] + ( y - polyY[ i ] ) / ( polyY[ j ] - polyY[ i ] ) * ( polyX[ j ] - polyX[ i ] ) < x ) {
oddTransitions = !oddTransitions;
}
}
}
return oddTransitions;
}
}
You could add this constructor to help you convert a Point array to a Polygon object.
public Polygon(Point[] points){
polySides = points.length;
polyY = new int[polySides];
polyX = new int[polySides];
for(int i = 0; i < polySides; i++){
polyY[i] = points[i].y;
polyX[i] = points[i].x;
}
}
You might be able to use it in your MyShape class with this method.
public boolean isTouched(final float X, final float Y){
final Polygon p = new Polygon(points);
return p.contains(X, Y);
}
Now if you have an odd shape you should be able to detect exactly if the use touches it. I have used this method many times.

Are you looking for a way to tell whether a touch event falls on the non-transparent portion of your drawn bitmap? If so, why don't you just map the touch coordinate to the proper pixel on the bitmap and test the color?
And if that's the case, then you can skip all the path clipping stuff, since the link you posted was only doing that to overcome emulator inefficiencies.

It's a bit complicated so I am not going to provide the full source but I will give you an idea.
You need to transfer your shape in to a triangles collection, then on touch find the nearest point of your shape and check if your are inside this point triangle.
For searching and sorting points you can use red-black-red tree structure.
The search algorithm eventually should be at O(log(N)) and creating shape structure should be O(N*Log(N))