2D学习之Bitmap

Canvas canvas =new Canvas();

Paint paint =new Paint();

canvas.drawColor(Color.BLACK);

//-------绘制位图

canvas.drawBitmap(bitmap,0,0, paint);

//-------旋转位图（方式1）

canvas.save();

canvas.rotate(30, bitmap.getWidth() /2, bitmap.getHeight() /2);

canvas.drawBitmap(bitmap,0,0, paint);

canvas.restore();

canvas.drawBitmap(bitmap,100,0, paint);

//-------旋转位图（方式2）

Matrix matrix =new Matrix();

matrix.postRotate(30, bitmap.getWidth() /2, bitmap.getHeight() /2);

canvas.drawBitmap(bitmap, matrix, paint);

//-------平移位图（方式1）

canvas.save();

canvas.translate(10,10);

canvas.drawBitmap(bitmap,0,0, paint);

canvas.restore();

//-------平移位图（方式2）

Matrix matrixT =new Matrix();

matrixT.postTranslate(10,10);

canvas.drawBitmap(bitmap, matrixT, paint);

//-------缩放位图（方式1）

canvas.save();

canvas.scale(2f,2f,50+ bitmap.getWidth(),50+ bitmap.getHeight());

canvas.drawBitmap(bitmap,50,50, paint);

canvas.restore();

canvas.drawBitmap(bitmap,50,50, paint);

//-------缩放位图（方式2）

Matrix matrixS =new Matrix();

matrixS.postTranslate(50,50);

matrixS.postScale(2f,2f,50+ bitmap.getWidth(),50+ bitmap.getHeight());

canvas.drawBitmap(bitmap, matrixS, paint);

canvas.drawBitmap(bitmap,50,50, paint);

//-------镜像翻转位图（方式1）

//X轴镜像

canvas.drawBitmap(bitmap,0,0, paint);

canvas.save();

canvas.scale(-1,1,100+ bitmap.getWidth() /2,100+ bitmap.getHeight() /2);

canvas.drawBitmap(bitmap,100,100, paint);

canvas.restore();

//Y轴镜像

canvas.drawBitmap(bitmap,0,0, paint);

canvas.save();

canvas.scale(1, -1,100+ bitmap.getWidth() /2,100+ bitmap.getHeight() /2);

canvas.drawBitmap(bitmap,100,100, paint);

canvas.restore();

//-------镜像翻转位图（方式2）

//X轴镜像

canvas.drawBitmap(bitmap,0,0, paint);

Matrix matrixX =new Matrix();

matrixX.postTranslate(100,100);

matrixX.postScale(-1,1,100+ bitmap.getWidth() /2,100+ bitmap.getHeight() /2);

canvas.drawBitmap(bitmap, matrixX, paint);

//Y轴镜像

canvas.drawBitmap(bitmap,0,0, paint);

Matrix matrixY =new Matrix();

matrixY.postTranslate(100,100);

matrixY.postScale(1, -1,100+ bitmap.getWidth() /2,100+ bitmap.getHeight() /2);

canvas.drawBitmap(bitmap, matrixY, paint);