silverlight实现图片局部放大效果的方法
本篇章节讲解silverlight实现图片局部放大效果的方法。分享给大家供大家参考,具体如下: 很多购物平台中(比如京东购物),浏览产品详情时都有这种效果,前几天看到有朋友问SL能不能实现,当然可以 界面: 1.左侧小图片(用一个矩形Fill一张图片即可) 原理: 获取左侧半透明矩形的相对位置,然后动态调整右侧大图的Canvas.Left与Canvas.Top 需要知道以下技术点: 1.Clip的应用 尺寸要点: 1.右侧大图可视区域与左侧半透明矩形的“长宽比例”应该相同 关键代码: using System.Windows; using System.Windows.Controls; using System.Windows.Input; namespace PartMagnifier { public partial class MainPage : UserControl { bool trackingMouseMove = false; Point mousePosition; public MainPage() { // 为初始化变量所必需 InitializeComponent(); } private void LayoutRoot_Loaded(object sender,System.Windows.RoutedEventArgs e) { Adjust(); } private void Rectangle_MouseLeftButtonDown(object sender,MouseButtonEventArgs e) { FrameworkElement element = sender as FrameworkElement; mousePosition = e.GetPosition(element); trackingMouseMove = true; if (null != element) { element.CaptureMouse(); element.Cursor = Cursors.Hand; } Adjust(); Debug(); sb.Begin();//标题动画,可去掉 } private void Rectangle_MouseMove(object sender,MouseEventArgs e) { FrameworkElement element = sender as FrameworkElement; if (trackingMouseMove) { double deltaV = e.GetPosition(element).Y - mousePosition.Y; double deltaH = e.GetPosition(element).X - mousePosition.X; double newTop = deltaV + (double)element.GetValue(Canvas.TopProperty); double newLeft = deltaH + (double)element.GetValue(Canvas.LeftProperty); if (newLeft <= 10) { newLeft = 10; } if (newLeft >= 130) { newLeft = 130; } if (newTop <= 10) { newTop = 10; } if (newTop >= 85) { newTop = 85; } element.SetValue(Canvas.TopProperty,newTop); element.SetValue(Canvas.LeftProperty,newLeft); mousePosition = e.GetPosition(element); Adjust(); if (mousePosition.X <= 0 || mousePosition.Y <= 0) { return; } Debug(); } } private void Rectangle_MouseLeftButtonUp(object sender,MouseButtonEventArgs e) { FrameworkElement element = sender as FrameworkElement; trackingMouseMove = false; element.ReleaseMouseCapture(); mousePosition.X = mousePosition.Y = 0; element.Cursor = null; } /// <summary> /// 调试信息 /// </summary> void Debug() { txtResult.Text = "鼠标相对坐标:" + mousePosition.ToString() + "n小框left:" + rect.GetValue(Canvas.LeftProperty) + ",小框top:" + rect.GetValue(Canvas.TopProperty) + "n大图left:" + ((double)img.GetValue(Canvas.LeftProperty)).ToString("F0") + ",大图right:" + ((double)img.GetValue(Canvas.TopProperty)).ToString("F0"); } /// <summary> /// 调整右侧大图的位置 /// </summary> void Adjust() { double n = cBig.Width / rect.Width; double left = (double)rect.GetValue(Canvas.LeftProperty) - 10; double top = (double)rect.GetValue(Canvas.TopProperty) - 10; double newLeft = -left * n; double newTop = -top * n; img.SetValue(Canvas.LeftProperty,newLeft); img.SetValue(Canvas.TopProperty,newTop); } } } 更多关于C#相关内容感兴趣的读者可查看本站专题:《C#图片操作技巧汇总》、《C#常见控件用法教程》、《WinForm控件用法总结》、《C#数据结构与算法教程》、《C#面向对象程序设计入门教程》及《C#程序设计之线程使用技巧总结》 希望本文所述对大家C#程序设计有所帮助。 (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |