android学习笔记4:画图
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在SurfaceView中使用Path类画图:
public class ClickSurfaceView extends SurfaceView implements
SurfaceHolder.Callback {
private Path pathAnnotate = null;
private Bitmap paintBitmap = null;
private Canvas paintCanvas = new Canvas();
private Paint paint = null;
private SurfaceHolder clickSurfaceHolder = null;
public ClickSurfaceView(Context context) {
super(context);
// 实例化SurfaceHolder
clickSurfaceHolder = this.getHolder();
// 添加回调
clickSurfaceHolder.addCallback(this);
}
public void onClickViewTouchEvent(MotionEvent event) {
int x = (int) event.getX();
int y = (int) event.getY();
int iAction = event.getAction();
paint = new Paint(Paint.DITHER_FLAG);
paint.setColor(paintColor);
paint.setAntiAlias(true);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeJoin(Paint.Join.ROUND);
paint.setStrokeCap(Paint.Cap.ROUND);
paint.setDither(true);
paint.setStrokeWidth(paintStrokeWidth);
switch (iAction) {
case MotionEvent.ACTION_DOWN:
pathAnnotate.reset();
pathAnnotate.moveTo(event.getX(), event.getY());
break;
case MotionEvent.ACTION_MOVE:// 110
if (paintBitmap == null) {
paintBitmap = Bitmap.createBitmap(780, 460,
Config.ARGB_8888);
paintCanvas.setBitmap(paintBitmap);
}
pathAnnotate.lineTo(event.getX(), event.getY());
paintCanvas.drawPath(pathAnnotate, paint);
synchronized (clickSurfaceHolder) {
Canvas canvas = clickSurfaceHolder.lockCanvas();
canvas.drawBitmap(paintBitmap, null, rectBitmapDisp, null);
clickSurfaceHolder.unlockCanvasAndPost(canvas);
}
break;
case MotionEvent.ACTION_UP:
break;
}
}
}
实现橡皮擦功能:paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
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