根据触摸粗或细线

Question

我正在使用核心图形绘制我的应用程序。

我想根据触摸速度绘制粗线或细线......

我已经编写了以下用于绘制粗线或细线的代码。

在我能够使用panGestureRecognizer跟踪速度并且我已经应用了它，对于线宽，因此我能够根据触摸的速度绘制粗细线。

但主要的问题是绘制的线条看起来不是很平滑。

如果我顺利画出成功的粗线或细线，那就太棒了。

- (void)handlePanGesture:(UIPanGestureRecognizer *)panGestureRecognizer
{

    if (panGestureRecognizer.state == UIGestureRecognizerStateBegan)
    {



        // retrieve touch point
        currentPoint = [panGestureRecognizer locationInView:panGestureRecognizer.view];

        previousPoint = currentPoint;



    }

    if (panGestureRecognizer.state == UIGestureRecognizerStateChanged)
    {

        currentPoint = [panGestureRecognizer locationInView:panGestureRecognizer.view];


        previousPoint = currentPoint; 

        float vel = [self ccpLength:[panGestureRecognizer velocityInView:panGestureRecognizer.view]];

        tmplinewidth    =   vel /   166.0f;

        tmplinewidth    =   clampf(tmplinewidth, 2, 20);


    }

    if (panGestureRecognizer.state == UIGestureRecognizerStateEnded)
    {

    }
}