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2014/10/16 ¤W¤È 08:10:27
android Programming Glossary: ballwHow can I use the animation framework inside the canvas? http://stackoverflow.com/questions/4938822/how-can-i-use-the-animation-framework-inside-the-canvas View int screenW int screenH int X int Y int initialY int ballW int ballH int angle float dY float acc Bitmap ball bgr public.. getResources R.drawable.sky_bgr load a background ballW ball.getWidth ballH ball.getHeight acc 0.2f acceleration dY.. true Resize background to fit the screen. X int screenW 2 ballW 2 Centre ball into the centre of the screen. Y initialY @Override..
Android: How to rotate a moving animated sprite based on the coordinates of its destination http://stackoverflow.com/questions/6003823/android-how-to-rotate-a-moving-animated-sprite-based-on-the-coordinates-of-its or matrix Matrix matrix new Matrix matrix.postRotate angle ballW 2 ballH 2 rotate it matrix.postTranslate X Y move it into x.. save the position of the canvas canvas.rotate angle X ballW 2 Y ballH 2 rotate the canvas' matrix canvas.drawBitmap ball..
How can I use the animation framework inside the canvas? http://stackoverflow.com/questions/4938822/how-can-i-use-the-animation-framework-inside-the-canvas setContentView new BallBounce this class BallBounce extends View int screenW int screenH int X int Y int initialY int ballW int ballH int angle float dY float acc Bitmap ball bgr public BallBounce Context context super context ball BitmapFactory.decodeResource.. load a ball image bgr BitmapFactory.decodeResource getResources R.drawable.sky_bgr load a background ballW ball.getWidth ballH ball.getHeight acc 0.2f acceleration dY 0 vertical speed initialY 100 Initial vertical position. angle.. screenW w screenH h bgr Bitmap.createScaledBitmap bgr w h true Resize background to fit the screen. X int screenW 2 ballW 2 Centre ball into the centre of the screen. Y initialY @Override public void onDraw Canvas canvas super.onDraw canvas Draw..
Android: How to rotate a moving animated sprite based on the coordinates of its destination http://stackoverflow.com/questions/6003823/android-how-to-rotate-a-moving-animated-sprite-based-on-the-coordinates-of-its First it is easy to rotate a sprite you can use canvas or matrix Matrix matrix new Matrix matrix.postRotate angle ballW 2 ballH 2 rotate it matrix.postTranslate X Y move it into x y position canvas.drawBitmap ball matrix null draw the ball.. draw the ball with the applied matrix method two canvas.save save the position of the canvas canvas.rotate angle X ballW 2 Y ballH 2 rotate the canvas' matrix canvas.drawBitmap ball X Y null draw the ball on the rotated canvas canvas.restore..
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