android滑动一个路线后 人物图片按此路线移动的实现
一般思路是先做人物两点件移动，手滑动时记录划过的坐标点组成一个点的集合（可以设采样间隔不用记录每个点，间隔越小人物移动的越平滑），再循环取集合内相邻的两点做人物移动。
首先你得重写onTouchEvent是必须的,然后使用一个定义private ArrayList<PointF> pinfs = new ArrayList<PointF>();来存所以的点在onTouchEvent中。
switch (event.getAction()) { case MotionEvent.ACTION_DOWN: pinfs.add(new PointF(event.getX(),event.getY())); break; case MotionEvent.ACTION_MOVE: pinfs.add(new PointF(event.getX(),event.getY())); break; case MotionEvent.ACTION_UP: invalidate(); break; } 然后在 @Override protected void onDraw(Canvas canvas) { for (PointF point : pinfs) { 这里绘制人物移动 } }
-------------------------------------------------------- 以下是完整代码 ------------------------
class CustomView1 extends View{ private Paint paint; private ArrayList<PointF> graphics = new ArrayList<PointF>(); private Paint lPaint; private Path mPath; private int of = 0; private Boolean over =false; private float mX, mY; private static final float TOUCH_TOLERANCE = 4; public CustomView1(Context context) { super(context); paint = new Paint(Paint.ANTI_ALIAS_FLAG); paint.setColor(Color.RED); paint.setStrokeJoin(Paint.Join.ROUND); paint.setStrokeCap(Paint.Cap.ROUND); paint.setStrokeWidth(65); lPaint = new Paint(Paint.ANTI_ALIAS_FLAG); lPaint.setColor(Color.BLACK); lPaint.setStyle(Paint.Style.STROKE);//空心 lPaint.setStrokeJoin(Paint.Join.ROUND); lPaint.setStrokeCap(Paint.Cap.ROUND); lPaint.setStrokeWidth(5); mPath = new Path(); } @Override public boolean onTouchEvent(MotionEvent event) { float x = event.getX(); float y = event.getY(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: over = false; graphics.clear(); of=0; graphics.add(new PointF(x, y)); touch_start(x, y); invalidate(); break; case MotionEvent.ACTION_MOVE: graphics.add(new PointF(x, y)); touch_move(x, y); invalidate(); break; case MotionEvent.ACTION_UP: over = true; touch_up(); invalidate(); break; } return true; } private void touch_start(float x, float y) { mPath.reset(); mPath.moveTo(x, y); mX = x; mY = y; } private void touch_move(float x, float y) { float dx = Math.abs(x - mX); float dy = Math.abs(y - mY); if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) { mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2); mX = x; mY = y; } } private void touch_up() { mPath.lineTo(mX, mY); } @Override protected void onDraw(Canvas canvas) { // canvas.drawColor(Color.TRANSPARENT,Mode.CLEAR); canvas.drawColor(Color.WHITE);//清理 canvas.drawPath(mPath, lPaint); if(over&&graphics.size()>0){ canvas.drawPoint(graphics.get(of).x, graphics.get(of).y, paint); of+=1; if(of<graphics.size()){ if(of==graphics.size()-1){ mPath.reset();//移动完成后移除线条 } invalidate(); } } } }
本文转自java豆子博客园博客，原文链接：http://www.cnblogs.com/error404/archive/2012/04/11/2441865.html，如需转载请自行联系原作者
