WPF : 以鼠标指针为中心缩放

最新推荐文章于 2024-07-15 17:00:23 发布

crystal2046

最新推荐文章于 2024-07-15 17:00:23 发布

阅读量2.3k

点赞数 1

分类专栏： Silverlight 文章标签： wpf object

Silverlight 专栏收录该内容

4 篇文章

订阅专栏

本文介绍了一种在 WPF 中实现视图缩放和平移的方法，通过使用 MouseWheel 事件调整 ScaleTransform 和 TranslateTransform 的属性来完成。提供了两种不同的实现方式，并详细解释了代码逻辑。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

XMAL:

------------------------------------------------------------------------------------------------------

Code:

private void mCanvas_MouseWheel(object sender, MouseWheelEventArgs e)
{

Point zoomCenter = e.GetPosition(this.mCanvas);//参数必须是this.mCanvas, e.GetPosition和RenderTransform有关?

            //或者:
            //Point screenPos = e.GetPosition(this);
            //Point zoomCenter = this.mCanvas.RenderTransform.Inverse.Transform(screenPos);

            Point pt = this.mCanvas.RenderTransform.Inverse.Transform(zoomCenter);
            this.mTranslateTf.X = (zoomCenter.X - pt.X) * this.mScaleTf.ScaleX ;
            this.mTranslateTf.Y = (zoomCenter.Y - pt.Y) * this.mScaleTf.ScaleY;
            this.mScaleTf.CenterX = zoomCenter.X;
            this.mScaleTf.CenterY = zoomCenter.Y;
            this.mScaleTf.ScaleX += e.Delta / 1000.0;
            this.mScaleTf.ScaleY += e.Delta / 1000.0;

Console.WriteLine("MouseWheel : " + zoomCenter.ToString());

}

或者

private void mCanvas_MouseWheel(object sender, MouseWheelEventArgs e)
{
Point mousePos = e.GetPosition(this);

    //oldCenter : untransformed and transformed
    Point untransformedOldCenter = new Point(this.mScaleTf.CenterX, this.mScaleTf.CenterY);
    Point transformedOldCenter = this.mScaleTf.Transform(untransformedOldCenter);

    //newCenter : untransformed and transformed
    Point untransformedNewCenter = this.mCanvas.RenderTransform.Inverse.Transform(mousePos);
    Point transformedNewCenter = mousePos;

double adjustX = transformedNewCenter.X - transformedOldCenter.X - untransformedNewCenter.X + untransformedOldCenter.X;

    //update transforms
    this.mTranslateTf.X = adjustX;
    this.mScaleTf.CenterX = untransformedNewCenter.X;
    this.mScaleTf.ScaleX += 0.1;
}

本文来自优快云博客，转载请标明出处：http://blog.youkuaiyun.com/ruanruoshi/archive/2009/09/25/4593366.aspx