我创建了一个如下所示的路径对象,它绘制了不同的形状。不同的按钮响应在画布上绘制不同的形状。我想移动我在画布中创建的路径对象,但我不知道如何。
我只知道在位图上而不是在路径对象上实现ontouchlistener的方法。
我的代码如下:
ArrayList<Path> paths = new ArrayList<Path>();
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
paintColor.setColor(Color.RED);
paintColor.setStrokeWidth(2);
paintColor.setStyle(Paint.Style.STROKE);
if (MainActivity.isRectangle) {
Path path = new Path();
path.moveTo(1, 1);
path.lineTo(90, 1);
path.lineTo(90, 60);
path.lineTo(1, 60);
path.close();
paths.add(path);
}
for (Path p : paths) {
canvas.drawPath(p, paintColor );
}
canvas.drawPath(path, paintColor);
invalidate();
}
//mainActivity
rectbutton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
isTriangle = false;
isRectangle = true;
isCircle= false;
isParallelogram = false;
isTapezium = false;
dv.invalidate();
}// onclick
});
的onTouchEvent
@Override
public boolean onTouch(View v,MotionEvent event){
switch(event.getAction()){
case MotionEvent.ACTION_DOWN:
//screen touch get x of the touch event
x = event.getX();
//screen touch get y of the touch event
y =event.getY();
for (Path p : paths) {
path.moveTo(x,y);
}
dv.invalidate();
break;
case MotionEvent.ACTION_UP:
//screen touch get x of the touch event
x = event.getX();
//screen touch get y of the touch event
y =event.getY();
break;
case MotionEvent.ACTION_MOVE:
//screen touch get x of the touch event
x = event.getX();
//screen touch get y of the touch event
y =event.getY();
break;
}
return true;
}
请指教。谢谢。
路径对象上没有onTouchListener。但是,请按照步骤实现此功能
1.)覆盖onTouchEvent()方法以查找您触摸的坐标。此链接可能有所帮助。 http://developer.android.com/training/graphics/opengl/touch.html
2.)创建一个RectF boundsRect,并为每个路径对象存储其边界坐标
Path.getBounds(boundsRect);
方法并同时检查触摸坐标是否位于上述方法的循环中的rectF boundsRect(使用bounds.contains(x,y))。
3.)选择该路径并立即对其进行所需操作。
编辑代码
@Override
public boolean onTouch(View v,MotionEvent event){
switch(event.getAction()){
case MotionEvent.ACTION_DOWN:
//screen touch get x of the touch event
x = event.getX();
//screen touch get y of the touch event
y = event.getY();
//check if touch point intersects the path bounds
for (Path p : paths) {
RectF pBounds = new RectF();
p.computeBounds(pBounds,true);
if(pBounds.contains(x,y)){
//select path
selected Path = p;// where selectedPath is assumed declared.
break;
}
dv.invalidate();
break;
case MotionEvent.ACTION_UP:
//screen touch get x of the touch event
x = event.getX();
//screen touch get y of the touch event
y = event.getY();
break;
case MotionEvent.ACTION_MOVE:
//screen touch get x of the touch event
x = event.getX();
//screen touch get y of the touch event
y = event.getY();
break;
}
}
return true;
}