Yeah, you can do this. Keep in mind, since you’re not attaching it to a layout, you’ll need to lay it out manually before drawing it: view.layout(0, 0, viewWidth, viewHeight); And unless you just know exactly what you want for those width and height parameters, you may also want to measure it first: int widthSpec … Read more
I understand this question is a bit dated, but for anyone still looking for an answer I can ELI5; Imagine the canvas is a piece of paper, and you’re tasked with drawing a picture of a robot right side up, at the bottom, and another robot upside down, slightly moved to the right, and about … Read more
Canvas.clipRect(left, top, right, bottom) reduces the region of the screen that future draw operations can write to. It sets the clipBounds to be the spacial intersection of the current clipping rectangle and the rectangle specified. There are lot of variants of the clipRect method that accept different forms for regions and allow different operations on … Read more
Finally I got the solution from this code: float radius = 20; final RectF oval = new RectF(); oval.set(point1.x – radius, point1.y – radius, point1.x + radius, point1.y+ radius); Path myPath = new Path(); myPath.arcTo(oval, startAngle, -(float) sweepAngle, true); To calculate startAngle, use this code: int startAngle = (int) (180 / Math.PI * Math.atan2(point.y – … Read more
Advice depends upon what you are trying to do. If you are concerned that your controls take a long time to draw, and you want to draw to a bitmap so you can blit the bitmap rather than re-drawing via a canvas, then you don’t want to be double-guessing the platform – controls automatically cache … Read more
Using Rect you define its edges using integers and using RectF they are defined as floats. Looking at them more carefully I have spotted a few differences actually. I will only list what one implementation has more compared to the other one. Rect equals(Object obj) (for some reason it has its own implementation of equals) … Read more
Drawing operations want Paint. In this Paint you set Paint.setFlags(Paint.ANTI_ALIAS_FLAG)
use the code below.. paint.setShader(new LinearGradient(0, 0, 0, getHeight(), Color.BLACK, Color.WHITE, Shader.TileMode.MIRROR)); canvas.drawPath(arrowPath, paint);
Try paint.setStyle(Paint.Style.FILL) and paint.setStyle(Paint.Style.STROKE). Paint paint = new Paint(); Rect r = new Rect(10, 10, 200, 100); @Override public void onDraw(Canvas canvas) { // fill paint.setStyle(Paint.Style.FILL); paint.setColor(Color.MAGENTA); canvas.drawRect(r, paint); // border paint.setStyle(Paint.Style.STROKE); paint.setColor(Color.BLACK); canvas.drawRect(r, paint); }
This image will explain you in detail: left The X coordinate of the left side of the rectangle top The Y coordinate of the top of the rectangle right The X coordinate of the right side of the rectangle bottom The Y coordinate of the bottom of the rectangle