Android的画点 [英] Android draw point

问题描述

如何绘制完整的圆或点用帆布？我用帆布和路径+油漆类

我的code：

  @覆盖
公共布尔onTouchEvent（MotionEvent事件）{
    浮eventX = event.getX（）;
    浮eventY = event.getY（）;
    的System.out.println（event.getAction（））;
    开关（event.getAction（））{
    案例MotionEvent.ACTION_DOWN：
        path.moveTo（eventX，eventY）;
        返回true;
    案例MotionEvent.ACTION_MOVE：
        path.lineTo（eventX，eventY）;
        打破;
    案例MotionEvent.ACTION_UP：
        path.addCircle（eventX，eventY，.1F，Path.Direction.CW）;
        打破;
    默认：
        返回false;
    }    //时间表重绘。
    无效（）;
    返回true;
}
 

解决方案

您可以通过重写绘制圆的onDraw（）自定义视图。请检查下面的链接工程图基础 -
http://developer.android.com/training/custom-views/custom -drawing.html

 保护无效的onDraw（帆布油画）{
 super.onDraw（画布）;
 canvas.drawCircle（X，Y，半径，油漆）;
}
 

此外，类似的答复的位置 - 如何绘制由帆布圈Android中？

how to draw full circle or point with canvas? I using canvas and path + paint classes

my code:

@Override
public boolean onTouchEvent(MotionEvent event) {
    float eventX = event.getX();
    float eventY = event.getY();
    System.out.println(event.getAction());
    switch (event.getAction()) {
    case MotionEvent.ACTION_DOWN:
        path.moveTo(eventX, eventY);
        return true;
    case MotionEvent.ACTION_MOVE:
        path.lineTo(eventX, eventY);
        break;
    case MotionEvent.ACTION_UP:
        path.addCircle(eventX, eventY, .1F, Path.Direction.CW);
        break;
    default:
        return false;
    }

    // Schedules a repaint.
    invalidate();
    return true;
}

解决方案

You can draw Circle by overriding onDraw() of your custom view. Check following link for drawing basics - http://developer.android.com/training/custom-views/custom-drawing.html

protected void onDraw(Canvas canvas) {
 super.onDraw(canvas);
 canvas.drawCircle(x, y, radius, paint);
}

Also, similar replies are here - How to draw circle by canvas in Android?

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