从Flash转C#，很多内容一知半解，边摸索边前进，代码粗糙，权当留个脚印。
只是想得到一个基础的移动和缩放功能的界面，找了很久都是画线、画矩形等基础形状的代码，移动和缩放说的并不清晰，只能自己努力来解决一下。
素材准备：
WPF项目的屏幕上放一个Canvas控件，名称为canvas1。
代码如下：
using System;
using System.Windows;
using System.Windows.Media;
using System.Windows.Input;
using System.Windows.Shapes;
using System.Windows.Controls; namespace WpfcanvasDrawing
{
/// <summary>
/// MainWindow.xaml 的交互逻辑
/// </summary>
public partial class MainWindow : Window
{
//移动标志
bool isMoving = false;
//鼠标按下去的位置
Point startMovePosition; TranslateTransform totalTranslate = new TranslateTransform();
TranslateTransform tempTranslate = new TranslateTransform();
ScaleTransform totalScale = new ScaleTransform();
Double scaleLevel = ; public MainWindow()
{
InitializeComponent(); canvas1.Focusable = true;//重要：默认条件下不接收鼠标事件
canvas1.HorizontalAlignment = System.Windows.HorizontalAlignment.Stretch;
canvas1.VerticalAlignment = System.Windows.VerticalAlignment.Stretch;
canvas1.Background = Brushes.Transparent;//.Cyan; DrawingLine(new Point(, ), new Point(, ));
DrawingLine(new Point(, ), new Point(, ));
} protected void DrawingLine(Point startPt, Point endPt)
{
LineGeometry myLineGeometry = new LineGeometry();
myLineGeometry.StartPoint = startPt;
myLineGeometry.EndPoint = endPt; Path myPath = new Path();
myPath.Stroke = Brushes.Black;
myPath.StrokeThickness = ;
myPath.Data = myLineGeometry; canvas1.Children.Add(myPath);
} private void canvas1_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
startMovePosition = e.GetPosition((Canvas)sender);
isMoving = true;
} private void canvas1_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
isMoving = false;
Point endMovePosition = e.GetPosition((Canvas)sender); //为了避免跳跃式的变换，单次有效变化 累加入 totalTranslate中。
totalTranslate.X += (endMovePosition.X - startMovePosition.X)/scaleLevel;
totalTranslate.Y += (endMovePosition.Y - startMovePosition.Y)/scaleLevel;
} private void canvas1_MouseMove(object sender, MouseEventArgs e)
{
if (isMoving)
{
Point currentMousePosition = e.GetPosition((Canvas)sender);//当前鼠标位置 Point deltaPt = new Point(, );
deltaPt.X = (currentMousePosition.X - startMovePosition.X) /scaleLevel;
deltaPt.Y = (currentMousePosition.Y - startMovePosition.Y) /scaleLevel; tempTranslate.X = totalTranslate.X + deltaPt.X;
tempTranslate.Y = totalTranslate.Y + deltaPt.Y; adjustGraph();
}
} private void canvas1_MouseWheel(object sender, MouseWheelEventArgs e)
{
Point scaleCenter = e.GetPosition((Canvas)sender); if (e.Delta > )
{
scaleLevel *= 1.08;
}
else
{
scaleLevel /= 1.08;
}
//Console.WriteLine("scaleLevel: {0}", scaleLevel); totalScale.ScaleX = scaleLevel;
totalScale.ScaleY = scaleLevel;
totalScale.CenterX = scaleCenter.X;
totalScale.CenterY = scaleCenter.Y; adjustGraph();
} private void adjustGraph()
{
TransformGroup tfGroup = new TransformGroup();
tfGroup.Children.Add(tempTranslate);
tfGroup.Children.Add(totalScale); foreach (UIElement ue in canvas1.Children)
{
ue.RenderTransform = tfGroup;
}
} }
}
变量说明：
//移动标志
bool isMoving = false;
//鼠标按下去的位置
Point startMovePosition; TranslateTransform totalTranslate = new TranslateTransform();//多次操作中需要对总的移动量进行统计。
ScaleTransform totalScale = new ScaleTransform();//缩放变量
Double scaleLevel = 1;//缩放的级别 函数功能说明：
DrawingLine 在指定的Canvas控件中画线，用于测试。
鼠标按下时，记录起始移动的位置点，标记拖动操作开始 isMoving = true。
鼠标移动过程中，将有效的移动距离记录到总移动变量 totalTranslate 当中，并对位置进行刷新。
鼠标滚轮变化时，根据滚轮方向调整缩放级别。
不同缩放级别下，屏幕中移动相同的距离，对于Canvs内的图形来说距离不同，因此需要对鼠标移动的距离进行修正，即将移动距离除以缩放级别，这样可以得到相对精确的移动位置。 遗留问题：
1、连续在不同位置进行缩放时，仍会有较小的抖动，细节处理上还有瑕疵。
2、使用下面的语句，可以实现canvas1自动缩放(将canvas1的宽度与高度设为Auto)。
canvas1.HorizontalAlignment = System.Windows.HorizontalAlignment.Stretch;
canvas1.VerticalAlignment = System.Windows.VerticalAlignment.Stretch; 学习太辛苦，采购点东西鼓励一下自己，微信扫描二维码，“香雪杂货店”欢迎您的到来，遇到喜欢的东西尽管带走~~