I'm trying to animate a background in a game I'm making.
https://imgur.com/kQGWsLu
Should look like this(terrible recording quality)
My first attempt work well on my phone but a lot of people saw their fps cut in half:
public void draw(Canvas canvas, Paint paint) {
if (mPaint == null) {
mPaint = new Paint();
mPaint.setColor(Color.GRAY);
mPaint.setStrokeWidth(1);
mPaint.setAntiAlias(true);
mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
mPaint.setShader(new RadialGradient(canvas.getWidth() / 4, canvas.getHeight() / 3,
Math.max(1, canvas.getHeight() / 2), Color.rgb(5, 12, 127), Color.rgb(32, 36, 100), Shader.TileMode.REPEAT));
}
width = canvas.getWidth();
height = canvas.getHeight();
canvas.save();
rotation += 4;
if (rotation > 360)
rotation = 0;
canvas.rotate(rotation, width / 2, height / 2);
canvas.drawCircle(width / 2, height / 2, height * 1.3f, mPaint);
canvas.restore();
}
So now I'm thinking about of pre rendering a image and drawing it as a bitmap that covers the screen and rotates instead. I also cut the calculations to only update every other frame instead.
public void draw(Canvas canvas, Paint paint) {
if (!initiated) {
centerX = (int) (canvas.getWidth() / 2);
centerY = (int) (canvas.getHeight() / 2);
width = (int) (canvas.getWidth() * 2f);
height = (int) (canvas.getHeight() * 2f);
map = factory.GFX().getBackground();
initiated = true;
}
if (!skipUpdate) {
x = CalculatorService.getXCircle(rotation, distance, centerX);
y = CalculatorService.getYCircle(rotation, distance, centerY);
body.set((int) x - width / 2,
(int) y - height / 2,
(int) x + (width / 2),
(int) y + (height / 2));
rotation += rotationSpeed;
if (rotation > 360)
rotation = 0;
}
skipUpdate = !skipUpdate;
canvas.drawBitmap(map, null, body, paint);
}
Though since the image is small in size 320*320 I had to scale it up and draw it bigger then the screen to avoid it moving out of bounds and showing the basic black background, and I'm not sure if this is really a improvement, do anyone have a better way of doing it or any advice on how I can improve?
I have a drawable of a gauge and I try to draw a line on it. (Fixed position, not fixed value)
Unfortunately I don't have any experience with drawing. (And I think its hard to understand)
At the moment it looks like this:
https://i.stack.imgur.com/5tkXEl.png
As you can see, its not positioned right and I'm quite afraid of looking at it on other devices.
Code (Class extends View):
private void init(Context context) {
bounds = new Rect();
gaugeBackground = ContextCompat.getDrawable(context, R.drawable.gauge);
arcPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
arcPaint.setColor(Color.RED);
arcPaint.setStyle(Paint.Style.STROKE);
arcPaint.setStrokeWidth(7f);
}
protected void onDraw(Canvas canvas) {
canvas.getClipBounds(bounds);
gaugeBackground.setBounds(bounds);
gaugeBackground.draw(canvas);
float padding = 5;
float size = getWidth() < getHeight() ? getWidth() : getHeight();
float width = size - (2 * padding);
float height = size - (2 * padding);
float radius = (width < height ? width /2 : height /2);
float rectLeft = (width /2) - radius + padding;
float rectTop = (getHeight() /2) - radius + padding;
float rectRight = (getWidth() /2) - radius + padding + width;
float rectBottom = (getHeight() /2) - radius + padding + height;
RectF mRect = new RectF(rectLeft, rectTop, rectRight, rectBottom);
canvas.drawArc(mRect, 119f, 300f, false, arcPaint);
}
Can someone provide helpful information? I hope I finally get the whole RectF/Drawing stuff..
Oh well, I had multiple issues with my implementation.
Main issue: The Background Image was 'warped', so the gauge wasn't really round.
Also: The code was kind of messed up and way too complicated.
I leave the question here - maybe it helps someone in the future.
protected void onDraw(Canvas canvas) {
canvas.getClipBounds(bounds);+
//0.86 == Aspect Ratio of the Background
gaugeBackground.setBounds(0, 0, bounds.right, (int) Math.round(bounds.bottom * 0.86));
gaugeBackground.draw(canvas);
float padding = 3;
float size = getWidth() < getHeight() ? getWidth() : getHeight();
float width = size - (2 * padding);
float height = size - (2 * padding);
RectF mRect = new RectF(padding, padding, width, height);
canvas.drawArc(mRect, 134f, 271f, false, arcPaint);
}
I'm trying to draw the spectrum of an audio file on a circle. Like this:
So on the circle I just want rectangles drawn like you see on the image.
I've got this code:
public void onRender(Canvas canvas, FFTData data, Rect rect) {
canvas.drawCircle(rect.width()/2, rect.height()/2, 200, mPaint);
for (int i = 0; i < data.bytes.length / mDivisions; i++) {
byte rfk = data.bytes[mDivisions * i];
byte ifk = data.bytes[mDivisions * i + 1];
float magnitude = (rfk * rfk + ifk * ifk);
int dbValue = (int) (10 * Math.log10(magnitude));
}
}
Where FFTData is the Fast Fourier Transformation data that Android gives me. Now in my dbValue I got the strength of the signal. mDivisions is how much bars I want. Currently set on 16 because I don't know how much I can set on the circle.
I'm stuck on how I can draw the rectangle with his center on the circle line... So I want a rectangle whose height is based on the dbValue so that I get high and low rectangles. And the center must be placed on my circle line.
Can someone help me on this math formula?
Run a loop over all 360 degrees of the circle (at wanted step), and, for each point, convert Polar (this angle and the radius of the circle) coordinates into Cartesian, as described here, for instance. This way you get the location of the centre of your rectangle.
Translate the system of the coordinates, making origin to be at the wanted point on the circle line and then rotate by the circle angle at that point.
Alternatively, you can build a trapezoid by getting corners at angle +- some offset and radius +- some offset (proportional to your value to plot). It will have shorter inner edge and longer outer edge. Such trapezoids may look better if painted side by side.
i think all you have needed is a pencil and a paper and a little math and also some free time to play :-)
public class MainActivity extends Activity {
ImageView drawingImageView;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
drawingImageView = (ImageView) this.findViewById(R.id.DrawingImageView);
Paint paint;
paint = new Paint();
paint.setColor(Color.GREEN);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(16);
final Bitmap bitmap = Bitmap.createBitmap((int) getWindowManager()
.getDefaultDisplay().getWidth(), (int) getWindowManager()
.getDefaultDisplay().getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
int centerX =400;
int centerY =400;
int R = 200;
canvas.drawCircle(centerX, centerY, R, paint);
int h = 100;
paint.setColor(Color.RED);
Path p = new Path();
p.moveTo(centerX + R - h/2, centerY);
p.lineTo(centerX + R + h/2, centerY);
canvas.drawPath(p, paint);
p = mySpectrumDrawer(centerX,centerY,R,h,15);
canvas.drawPath(p, paint);
h = 50;
p = mySpectrumDrawer(centerX,centerY,R,h,30);
canvas.drawPath(p, paint);
h = 60;
p = mySpectrumDrawer(centerX,centerY,R,h,60);
canvas.drawPath(p, paint);
h = 80;
p = mySpectrumDrawer(centerX,centerY,R,h,90);
canvas.drawPath(p, paint);
drawingImageView.setImageBitmap(bitmap);
}
private Path mySpectrumDrawer(int centerX, int centerY,int R,int height, int angel){
Path p = new Path();
int dX = (int) (R*(Math.cos(Math.toRadians(angel))));
int dY = (int) (R*(Math.sin(Math.toRadians(angel))));
int dhx = (int) (height/2*(Math.cos(Math.toRadians(angel))));
int dhy = (int) (height/2*(Math.sin(Math.toRadians(angel))));
p.moveTo(centerX + dX - dhx , centerY - dY + dhy);
p.lineTo(centerX + dX + dhx , centerY - dY - dhy);
return p;
}
}
I now have a View that is added programically after the onCreate (Depending on some other variables). Everything works as it should and it draws part of a circle.
But my question is how do i redraw it later on ? I need to change the angle in the circle after some data is fetched.
Code for the WindRose :
public class WindRose extends View {
public WindRose(Context context) {
super(context);
}
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvasTest = canvas;
float height = (float) getHeight();
float width = (float) getWidth();
float radius;
if (width > height) {
radius = height / 2;
} else {
radius = width / 2;
}
// radius = (height )/ 2;
Path path = new Path();
path.addCircle(width, height, radius, Path.Direction.CCW);
// / 2
Resources resources = getResources();
int color = resources.getColor(R.color.green_back);
paint.setColor(color);
paint.setStrokeWidth(5);
paint.setStyle(Paint.Style.FILL);
float center_x, center_y;
center_x = width / 2;
center_y = height / 2;
//Formulas :
//SD = Start Degree
//ED = End Degree
//If cakepiece passes 0 (East)
//SD, 360-(SD+ED)
//Else :
//SD, (ED-SD)
oval.set(center_x - radius, center_y - radius, center_x + radius, center_y + radius);
if (End > Start) {
canvas.drawArc(oval, Start, (End - Start), true, paint);
} else if (End < Start) {
canvas.drawArc(oval, Start, ((360 - Start) + End), true, paint);
}
}
}
If i update the Start and End variables nothing happens. i have also tried to call invalidate on the class but also there i dont get any redrawing.
Invalidate that i've tried :
WindRose windrose = new WindRose(this);
windrose.invalidate();
Was called from the main class which WindRose is part of.
How should i do this correctly ?
Maybe calling the invalidate() method of the view will help.
You can read more here(http://developer.android.com/reference/android/view/View.html), but:
"To force a view to draw, call invalidate()."
Note, also that you can invalidate only parts of a view
I am able to draw a circle and a rectangle on canvas by using
path.addCircle()
and
path.addRect().
And now I am wondering how to draw a triangle or a star or a square or a heart?
For future direct answer seekers, I have drawn an almost symmetric star using canvas, as shown in the image:
The main tool is using Paths.
Assuming you have setup:
Paint paint = new Paint();
paint.setColor(Color.WHITE);
paint.setAntiAlias(true);
paint.setStyle(Paint.Style.STROKE);
Path path = new Path();
Then in you onDraw you can use the path like I do below. It will scale properly to any sizes canvas
#Override
protected void onDraw(Canvas canvas) {
float mid = getWidth() / 2;
float min = Math.min(getWidth(), getHeight());
float fat = min / 17;
float half = min / 2;
float rad = half - fat;
mid = mid - half;
paint.setStrokeWidth(fat);
paint.setStyle(Paint.Style.STROKE);
canvas.drawCircle(mid + half, half, rad, paint);
path.reset();
paint.setStyle(Paint.Style.FILL);
// top left
path.moveTo(mid + half * 0.5f, half * 0.84f);
// top right
path.lineTo(mid + half * 1.5f, half * 0.84f);
// bottom left
path.lineTo(mid + half * 0.68f, half * 1.45f);
// top tip
path.lineTo(mid + half * 1.0f, half * 0.5f);
// bottom right
path.lineTo(mid + half * 1.32f, half * 1.45f);
// top left
path.lineTo(mid + half * 0.5f, half * 0.84f);
path.close();
canvas.drawPath(path, paint);
super.onDraw(canvas);
}
For everybody that needs a heart shape:
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Path;
import android.view.View;
public class Heart extends View {
private Path path;
private Paint paint;
public Heart(Context context) {
super(context);
path = new Path();
paint = new Paint(Paint.ANTI_ALIAS_FLAG);
}
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
// Fill the canvas with background color
canvas.drawColor(Color.WHITE);
paint.setShader(null);
float width = getContext().getResources().getDimension(R.dimen.heart_width);
float height = getContext().getResources().getDimension(R.dimen.heart_height);
// Starting point
path.moveTo(width / 2, height / 5);
// Upper left path
path.cubicTo(5 * width / 14, 0,
0, height / 15,
width / 28, 2 * height / 5);
// Lower left path
path.cubicTo(width / 14, 2 * height / 3,
3 * width / 7, 5 * height / 6,
width / 2, height);
// Lower right path
path.cubicTo(4 * width / 7, 5 * height / 6,
13 * width / 14, 2 * height / 3,
27 * width / 28, 2 * height / 5);
// Upper right path
path.cubicTo(width, height / 15,
9 * width / 14, 0,
width / 2, height / 5);
paint.setColor(Color.RED);
paint.setStyle(Style.FILL);
canvas.drawPath(path, paint);
}
}
Sorry for all the numbers but these worked best for me :) The result looks like this:
You have to find out the math behind that figures. The triangle and the star are quite easy to draw. Here is how you can draw a heart: http://www.mathematische-basteleien.de/heart.htm
To draw special paths you should create them by adding points, ellipses etc. The canvas supports a clipping mask of a specified path, so you can set the clipping mask of a heart, push the paths to the matrix, draw the content of the heart, and then pop it again.
That's what I'm doing to achieve a simulated 2D page curl effect on andriod: http://code.google.com/p/android-page-curl/
Hope this helps!
this method will return a path with the number of corners given inside a square of the given width. Add more parameters to handle small radius and such things.
private Path createStarBySize(float width, int steps) {
float halfWidth = width / 2.0F;
float bigRadius = halfWidth;
float radius = halfWidth / 2.0F;
float degreesPerStep = (float) Math.toRadians(360.0F / (float) steps);
float halfDegreesPerStep = degreesPerStep / 2.0F;
Path ret = new Path();
ret.setFillType(FillType.EVEN_ODD);
float max = (float) (2.0F* Math.PI);
ret.moveTo(width, halfWidth);
for (double step = 0; step < max; step += degreesPerStep) {
ret.lineTo((float)(halfWidth + bigRadius * Math.cos(step)), (float)(halfWidth + bigRadius * Math.sin(step)));
ret.lineTo((float)(halfWidth + radius * Math.cos(step + halfDegreesPerStep)), (float)(halfWidth + radius * Math.sin(step + halfDegreesPerStep)));
}
ret.close();
return ret;
}
If you need to draw a star inside a square, you can use the code below.
posX and posY are the coordinates for the upper left corner of the square that encloses the tips of the star (the square is not actually drawn).
size is the width and height of the square.
a is the top tip of the star. The path is created clockwise.
This is by no means a perfect solution, but it gets the job done very quickly.
public void drawStar(float posX, float posY, int size, Canvas canvas){
int hMargin = size/9;
int vMargin = size/4;
Point a = new Point((int) (posX + size/2), (int) posY);
Point b = new Point((int) (posX + size/2 + hMargin), (int) (posY + vMargin));
Point c = new Point((int) (posX + size), (int) (posY + vMargin));
Point d = new Point((int) (posX + size/2 + 2*hMargin), (int) (posY + size/2 + vMargin/2));
Point e = new Point((int) (posX + size/2 + 3*hMargin), (int) (posY + size));
Point f = new Point((int) (posX + size/2), (int) (posY + size - vMargin));
Point g = new Point((int) (posX + size/2 - 3*hMargin), (int) (posY + size));
Point h = new Point((int) (posX + size/2 - 2*hMargin), (int) (posY + size/2 + vMargin/2));
Point i = new Point((int) posX, (int) (posY + vMargin));
Point j = new Point((int) (posX + size/2 - hMargin), (int) (posY + vMargin));
Path path = new Path();
path.moveTo(a.x, a.y);
path.lineTo(b.x, b.y);
path.lineTo(c.x, c.y);
path.lineTo(d.x, d.y);
path.lineTo(e.x, e.y);
path.lineTo(f.x, f.y);
path.lineTo(f.x, f.y);
path.lineTo(g.x, g.y);
path.lineTo(h.x, h.y);
path.lineTo(i.x, i.y);
path.lineTo(j.x, j.y);
path.lineTo(a.x, a.y);
path.close();
canvas.drawPath(path, paint);
}
In addition to ellipse and rectangular you will need those two (as minimum):
drawLine(float startX, float startY, float stopX, float stopY, Paint paint)
drawLines(float[] pts, int offset, int count, Paint paint)
example:
How to draw a line in android
Documentation on Canvas: http://developer.android.com/reference/android/graphics/Canvas.html
Its very good to use instance of Shape class ))
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
HeartShape shape = new HeartShape();
ShapeDrawable shapeDrawable = new ShapeDrawable(shape);
shapeDrawable.setColorFilter(new LightingColorFilter(0, Color.BLUE));
LinearLayout linearLayout = new LinearLayout(this);
linearLayout.setLayoutParams(new LinearLayout.LayoutParams(350 * 3, 350 * 3));
linearLayout.setBackground(shapeDrawable);
setContentView(linearLayout);
}
Create a shape class which was render nice Heart
public class HeartShape extends Shape {
private final int INVALID_SIZE = -1;
private Path mPath = new Path();
private RectF mRectF = new RectF();
private float mOldWidth = INVALID_SIZE;
private float mOldHeight = INVALID_SIZE;
private float mScaleX, mScaleY;
public HeartShape() {
}
#Override
public void draw(Canvas canvas, Paint paint) {
canvas.save();
canvas.scale(mScaleX, mScaleY);
float width = mRectF.width();
float height = mRectF.height();
float halfWidth = width/2;
float halfHeight = height/2;
float stdDestX = 5 * width / 14;
float stdDestY = 2 * height / 3;
PointF point1 = new PointF(stdDestX, 0);
PointF point2 = new PointF(0, height / 15);
PointF point3 = new PointF(stdDestX / 5, stdDestY);
PointF point4 = new PointF(stdDestX, stdDestY);
// Starting point
mPath.moveTo(halfWidth, height / 5);
mPath.cubicTo(point1.x, point1.y, point2.x, point2.y, width / 28, 2 * height / 5);
mPath.cubicTo(point3.x, point3.y, point4.x, point4.y, halfWidth, height);
canvas.drawPath(mPath, paint);
canvas.scale(-mScaleX, mScaleY, halfWidth, halfHeight);
canvas.drawPath(mPath, paint);
canvas.restore();
}
#Override
protected void onResize(float width, float height) {
mOldWidth = mOldWidth == INVALID_SIZE ? width : Math.max(1, mOldWidth);
mOldHeight = mOldHeight == INVALID_SIZE ? height : Math.max(1, mOldHeight);
width = Math.max(1, width);
height = Math.max(1, height);
mScaleX = width / mOldWidth;
mScaleY = height / mOldHeight;
mOldWidth = width;
mOldHeight = height;
mRectF.set(0, 0, width, height);
}
#Override
public void getOutline(#NonNull Outline outline) {
// HeartShape not supported outlines
}
#Override
public HeartShape clone() throws CloneNotSupportedException {
HeartShape shape = (HeartShape) super.clone();
shape.mPath = new Path(mPath);
return shape;
}
}
Well if you want to draw only the shapes you specify I recommend first creat a class for each shape and make each shape implement draw() method where you can pass canvas and paint object.
For example to create multiple stars, first create a class "Star" and implement the logic there.
class Star(
var cx: Float = 0f,
var cy: Float = 0f,
var radius: Float = 0f,
var angle: Float = 0f,
var color: Int = Color.WHITE,
var numberOfSpikes: Int = 5,
var depth: Float = 0.4f
) {
val path: Path = Path()
val point: PointF = PointF()
fun init() {
path.rewind()
var totalAngle = 0f
for (i in 0 until numberOfSpikes * 2) {
val x = cx
var y = cy
y -= if (i % 2 != 0) (radius * depth)
else (radius * 1f)
StaticMethods.rotate(cx, cy, x, y, totalAngle, false, point)
totalAngle += 360f / (numberOfSpikes * 2)
if (i == 0) {
path.moveTo(point.x, point.y)
} else {
path.lineTo(point.x, point.y)
}
}
}
fun draw(canvas: Canvas, paint: Paint) {
paint.apply {
style = Paint.Style.FILL
color = this#Star.color
}
canvas.drawPath(path, paint)
}
}
object StaticMethods {
/**
* Rotate a point around a center with given angle
* #param cx rotary center point x coordinate
* #param cy rotary center point y coordinate
* #param x x coordinate of the point that will be rotated
* #param y y coordinate of the point that will be rotated
* #param angle angle of rotation in degrees
* #param anticlockWise rotate clockwise or anti-clockwise
* #param resultPoint object where the result rotational point will be stored
*/
fun rotate(cx: Float, cy: Float, x: Float, y: Float, angle: Float, anticlockWise: Boolean = false, resultPoint: PointF = PointF()): PointF {
if (angle == 0f) {
resultPoint.x = x
resultPoint.y = y
return resultPoint
}
val radians = if (anticlockWise) {
(Math.PI / 180) * angle
} else {
(Math.PI / -180) * angle
}
val cos = Math.cos(radians)
val sin = Math.sin(radians)
val nx = (cos * (x - cx)) + (sin * (y - cy)) + cx
val ny = (cos * (y - cy)) - (sin * (x - cx)) + cy
resultPoint.x = nx.toFloat()
resultPoint.y = ny.toFloat()
return resultPoint
}
/**
* Inline function that is called, when the final measurement is made and
* the view is about to be draw.
*/
inline fun View.afterMeasured(crossinline function: View.() -> Unit) {
viewTreeObserver.addOnGlobalLayoutListener(object :
ViewTreeObserver.OnGlobalLayoutListener {
override fun onGlobalLayout() {
if (measuredWidth > 0 && measuredHeight > 0) {
viewTreeObserver.removeOnGlobalLayoutListener(this)
function()
}
}
})
}
}
And then create a custom view where you can draw your shapes, below is the code that creates 100 random stars and draws them on canvas.
class StarView : View {
constructor(context: Context) : super(context)
constructor(context: Context, attrs: AttributeSet?) : super(context, attrs)
constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int) : super(context, attrs, defStyleAttr)
val stars: ArrayList<Helper.Star> = arrayListOf()
val paint: Paint = Paint().apply {
isAntiAlias = true
}
init {
// after the view is measured and we have the width and height
afterMeasured {
// create 100 stars
for (i in 0 until 100) {
val star = Helper.Star(
cx = width * Math.random().toFloat(),
cy = height * Math.random().toFloat(),
radius = width * 0.1f * Math.random().toFloat(),
)
star.init()
stars.add(star)
}
}
}
override fun onDraw(canvas: Canvas) {
stars.forEach {
it.draw(canvas, paint)
}
}
}
Here is the result:
If you want to create a lot of different complex shapes you can use this library. Where you can pass svg shapes using the Path Data as a string. By first creating complex shapes using any SVG vector editor such as
Microsoft Expression Design
Adobe Illustrator
Inkscape