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    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

		}

本次矢量画图编程就介绍到这里，如果还有不明白的地方，可以加入扣扣群234035436进行技术交流，希望大家多多支持！