要实现C#代码画矢量图，其基本原理是先创建一个容器作为画板，然后创建Line(直线)、PolyLine(多段线)、Rectangle(矩形)或者Ellipse(椭圆)基本绘图对象生成各种矢量图形，最后把这些图形对象添加到画板中即可，一般用Canvas容器作为画板。下面以在Canvas容器控件中绘制Line(直线)、PolyLine(多段线)、Rectangle(矩形)或者Ellipse(椭圆)等基本图形对矢量绘图进行简单的介绍，希望对大家有所帮助。
创建一个C#项目，在项目中添加Canvas并把Canvas属性的旋转角度设置为-90度，然后添加绘制各种基本图形的按钮
绘制坐标系效果图及代码
private void PaintGrid()//画坐标系{Line l=new Line();l.X1=0;l.Y1=10;l.X2=0;l.Y2=this.canvas.Height-10;l.StrokeThickness=1;l.Stroke=new SolidColorBrush(Color.FromRgb(0, 0, 0));Canvas.SetLeft(l,this.canvas.Width/2);this.canvas.Children.Add(l);l=new Line();l.X1=10;l.Y1=0;l.X2=this.canvas.Width-10;;l.Y2=0;l.StrokeThickness=1;l.Stroke=new SolidColorBrush(Color.FromRgb(0, 0, 0));Canvas.SetTop(l,this.canvas.Height/2);this.canvas.Children.Add(l);for(int i=-10;i<=10;i++){l=new Line();Line ly=new Line();l.X1=i*15;l.X2=i*15;ly.Y1=i*15;ly.Y2=i*15;if(i%2==0){l.Y1=-5;l.Y2=5;ly.X1=-5;ly.X2=5;}else{l.Y1=-10;l.Y2=10;ly.X1=-10;ly.X2=10;}l.StrokeThickness=1;l.Stroke=new SolidColorBrush(Color.FromRgb(0, 0, 0));Canvas.SetLeft(l,this.canvas.Width/2);Canvas.SetTop(l,this.canvas.Height/2);ly.StrokeThickness=1;ly.Stroke=new SolidColorBrush(Color.FromRgb(0, 0, 0));Canvas.SetLeft(ly,this.canvas.Width/2);Canvas.SetTop(ly,this.canvas.Height/2);this.canvas.Children.Add(ly);this.canvas.Children.Add(l);}Label lb=new Label();lb.Content="X";RotateTransform rotateTransform = new RotateTransform(90);//90度lb.RenderTransform=rotateTransform;Canvas.SetRight(lb,5);Canvas.SetTop(lb,canvas.Height/2-20);this.canvas.Children.Add(lb);lb=new Label();lb.Content="Y";lb.RenderTransform=rotateTransform;Canvas.SetRight(lb,canvas.Width/2-15);Canvas.SetBottom(lb,10);this.canvas.Children.Add(lb);Polyline pl=new Polyline();pl.Points.Add(new Point(this.canvas.Width/2-20,-5));pl.Points.Add(new Point(this.canvas.Width/2-10,0));pl.Points.Add(new Point(this.canvas.Width/2-20,5));pl.Stroke=new SolidColorBrush(Color.FromRgb(0,0,0));pl.StrokeThickness=1;Canvas.SetLeft(pl,this.canvas.Width/2);Canvas.SetTop(pl,this.canvas.Height/2);this.canvas.Children.Add(pl);pl=new Polyline();pl.Points.Add(new Point(-5,this.canvas.Height/2-20));pl.Points.Add(new Point(0,this.canvas.Height/2-10));pl.Points.Add(new Point(5,this.canvas.Height/2-20));pl.Stroke=new SolidColorBrush(Color.FromRgb(0,0,0));pl.StrokeThickness=1;Canvas.SetLeft(pl,this.canvas.Width/2);Canvas.SetTop(pl,this.canvas.Height/2);this.canvas.Children.Add(pl);}绘制直线代码
private void bth_paint_Line(object sender, System.Windows.RoutedEventArgs e)//画直线{this.canvas.Children.Clear();//清空画板this.PaintGrid();//画坐标系Line l=new Line();//直线l.X1=0;l.Y1=0;l.X2=200;l.Y2=200;l.StrokeThickness=1;//直线宽度l.Stroke=new SolidColorBrush(Color.FromRgb(0, 0, 255));//直线颜色(蓝色)Canvas.SetLeft(l,this.canvas.Width/2);//X的原点平移到canvas容器中间Canvas.SetTop(l,this.canvas.Height/2);//Y的原点平移到canvas容器中间this.canvas.Children.Add(l);//在容器中添加该直线}效果图
画多段线代码
private void bth_paint_Polyline(object sender, System.Windows.RoutedEventArgs e)//画多段线{this.canvas.Children.Clear();//清空画板this.PaintGrid();//画坐标系Polyline pl=new Polyline();pl.Points.Add(new Point(0,0));pl.Points.Add(new Point(50,50));pl.Points.Add(new Point(0,100));pl.Points.Add(new Point(50,150));pl.Stroke=new SolidColorBrush(Color.FromRgb(0,0,255));pl.StrokeThickness=1;Canvas.SetLeft(pl,this.canvas.Width/2);//X的原点平移到canvas容器中间Canvas.SetTop(pl,this.canvas.Height/2);//Y的原点平移到canvas容器中间this.canvas.Children.Add(pl);//在容器中添加该多段线}效果图
画矩形代码
private void bth_paint_Rectangle(object sender, System.Windows.RoutedEventArgs e)//画矩形{this.canvas.Children.Clear();//清空画板this.PaintGrid();//画坐标系Rectangle rect=new Rectangle();rect.Width=100;rect.Height=200;rect.Stroke=new SolidColorBrush(Color.FromRgb(0,0,255));rect.StrokeThickness=1;Canvas.SetLeft(rect,this.canvas.Width/2-rect.Width/2);Canvas.SetTop(rect,this.canvas.Height/2-rect.Height/2);this.canvas.Children.Add(rect); }效果图
画圆代码
private void bth_paint_Circle(object sender, System.Windows.RoutedEventArgs e)//画圆{this.canvas.Children.Clear();//清空画板this.PaintGrid();//画坐标系Ellipse ep=new Ellipse();ep.Height=300;ep.Width=300;ep.Stroke=new SolidColorBrush(Color.FromRgb(0, 0, 255));ep.StrokeThickness=1;Canvas.SetLeft(ep,this.canvas.Width/2-ep.Width/2);Canvas.SetTop(ep,this.canvas.Height/2-ep.Height/2);this.canvas.Children.Add(ep);}效果图
画椭圆代码
private void bth_paint_Ellipse(object sender, System.Windows.RoutedEventArgs e)//画椭圆{this.canvas.Children.Clear();//清空画板this.PaintGrid();//画坐标系Ellipse ep=new Ellipse();ep.Height=300;ep.Width=50;ep.Stroke=new SolidColorBrush(Color.FromRgb(0, 0, 255));ep.StrokeThickness=1;Canvas.SetLeft(ep,this.canvas.Width/2-ep.Width/2);Canvas.SetTop(ep,this.canvas.Height/2-ep.Height/2);this.canvas.Children.Add(ep);}效果图
清空画板代码
private void btn_Clear(object sender, System.Windows.RoutedEventArgs e){this.canvas.Children.Clear();//清空画板this.PaintGrid();//画坐标系}
