android - 画出连接三点的完美曲线

Question

我想在屏幕上画一条连接三点的曲线

PointA = (480,46)
PointB = (160,137)
PointC = (0,228)

如何使用Android API绘制曲线？

Answer 1

无论我想要什么，我都可以使用以下代码生成它:

protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);

    PointF mPoint1 = new PointF(w/1.2F, h/1.2F);
    PointF mPoint2 = new PointF(w/24, h/1.2F);
    Path myPath1 = new Path();
    Paint paint  = new Paint();
    paint.setAntiAlias(true);
    paint.setStyle(Style.STROKE);
    paint.setStrokeWidth(2);
    paint.setColor(Color.WHITE);

    myPath1 = drawCurve(canvas, paint, mPoint1, mPoint2);
    canvas.drawPath(myPath1, paint);

}

private Path drawCurve(Canvas canvas, Paint paint, PointF mPointa, PointF mPointb) {

    Path myPath = new Path();
    myPath.moveTo(63*w/64, h/10);
    myPath.quadTo(mPointa.x, mPointa.y, mPointb.x, mPointb.y);
    return myPath;  
}

这将找到屏幕的两侧(横向模式)并在屏幕上绘制一条完美的曲线。