我准备了一个绘画应用程序,在我的应用中我们可以画任何东西,它运行良好。在这里,我想为擦除绘画准备手指擦除。为此,我已经准备了以下代码:
这是触摸事件:
mMyPaint.setOnTouchListener(new OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
if(paintAndEraserFlag==0){
if (event.getAction() == MotionEvent.ACTION_DOWN) {
// path = new Path();
mPath.moveTo(event.getX(), event.getY());
mPath.lineTo(event.getX(), event.getY());
mArryLstPath.add(mPath);
} else if (event.getAction() == MotionEvent.ACTION_MOVE) {
mPath.lineTo(event.getX(), event.getY());
} else if (event.getAction() == MotionEvent.ACTION_UP) {
mPath.lineTo(event.getX(), event.getY());
}
}else if(paintAndEraserFlag==1){
if (event.getAction() == MotionEvent.ACTION_DOWN) {
// path = new Path();
System.out.println("in path---");
mPath.moveTo(event.getX(), event.getY());
mPath.lineTo(event.getX(), event.getY());
mArryLstEarser.add(mEraserPath);
} else if (event.getAction() == MotionEvent.ACTION_MOVE) {
mPath.lineTo(event.getX(), event.getY());
} else if (event.getAction() == MotionEvent.ACTION_UP) {
mPath.lineTo(event.getX(), event.getY());
}
}
mMyPaint.invalidate();
return true;
}
});
我的绘画和橡皮擦对象,
mPaint.setDither(true);
mPaint.setColor(0xFFD2691E);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeJoin(Paint.Join.ROUND);
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setStrokeWidth(30);
mEraser.setDither(true);
mEraser.setStyle(Paint.Style.STROKE);
mEraser.setStrokeJoin(Paint.Join.ROUND);
mEraser.setStrokeCap(Paint.Cap.ROUND);
mEraser.setStrokeWidth(15);
mEraser.setColor(0x00000000);
这是我的自定义视图中的onDraw方法。
public void onDraw(Canvas canvas) {
if (myDrawBitmap == null) {
myDrawBitmap = Bitmap.createBitmap(480, 800,
Bitmap.Config.ARGB_8888);
mBmpDrawCanvas = new Canvas(myDrawBitmap);
mIntDrawArray = new int[myDrawBitmap.getWidth()
* myDrawBitmap.getHeight()];
}
if (mBmpDrawCanvas != null) {
myDrawBitmap.getPixels(mIntDrawArray, 0, myDrawBitmap.getWidth(),
0, 0, myDrawBitmap.getWidth(), myDrawBitmap.getHeight());
if (MyEraserActivity.paintAndEraserFlag == 0) {
for (Path path : MyEraserActivity.mArryLstPath) {
mBmpDrawCanvas.drawPath(MyEraserActivity.mPath, mPaint);
}
} else if (MyEraserActivity.paintAndEraserFlag == 1) {
for (Path path : MyEraserActivity.mArryLstEarser) {
mBmpDrawCanvas.drawPath(MyEraserActivity.mEraserPath,
mEraser);
System.out.println("in eraser---");
}
}
if (myDrawBitmap != null)
canvas.drawBitmap(myDrawBitmap, 0, 0, null);
}
}
我想要擦掉我触碰到的油漆,如果油漆已经干了,请帮忙。