C # GDI + simple Drawing

First, use pen brush

The main properties of a pen are:

Color (colors), dashcap (dash End shape), DashStyle (dash style), Endcap (line tail shape), StartCap (head shape), Width (thickness), etc.

We can use a pen to draw dashed lines, lines with arrows, and so on.

Pen p =NewPen (Color.Blue,5); Graphics g= This. CreateGraphics ();//not here in load, can it be in paint? //draw a dashed lineP.dashstyle = System.Drawing.Drawing2D.DashStyle.Dot;//defines the style of the dashed line as a pointG.drawline (P,Ten,Ten, $,Ten); //Custom Dashed linesP.dashpattern =New float[] {2,1};//set an array of dashes and blank partsG.drawline (P,Ten, -, $, -); //draw arrows, only useful for non-closed curvesP.dashstyle = System.Drawing.Drawing2D.DashStyle.Solid;//Restore Solid linesP.endcap = System.Drawing.Drawing2D.LineCap.ArrowAnchor;//defines the style of the end of the line as an arrowG.drawline (P,Ten, -, $, -);            G.dispose (); P.dispose ();

Post-run Effects:

Ii. use of the bush

The role of paint brush: can be used to fill the shape, multilateral, oval, fan ....

• SolidBrush: The simplest form of painting, painted with a solid color
• HatchBrush: Similar to SolidBrush, but you can use this class to select a pattern to use from a large number of preset patterns, rather than a solid color
• TextureBrush: Drawing with textures (like)
• LinearGradientBrush: Drawing with two colors blended along a gradient
• PathGradientBrush: Drawing with complex blend color gradients based on a unique path defined by the programmer

Graphics g = This. CreateGraphics ();//not here in load, can it be in paint? Rectangle rect =NewRectangle (Ten,Ten, -, -);//defines the rectangle, with the parameter as the starting horizontal ordinate and its length and width//Monochrome FillSolidBrush B1 =NewSolidBrush (Color.Blue);//defining a monochrome paint brushG.fillrectangle (B1, rect);//Fill this rectangle//stringg.DrawString ("string",NewFont ("Song Body",Ten), B1,NewPointF ( -,Ten)); //Fill with picturesTextureBrush B2 =NewTextureBrush (Image.FromFile (@"D:\DOWNLOAD\sample.jpg")); Rect. Location=NewPoint (Ten, -);//change the start coordinate of this rectangleRect. Width = $;//Change the width of this rectangleRect. Height = $;//Change the height of this rectangleG.fillrectangle (B2, rect); //fill with gradient colorRect. Location =NewPoint (Ten,290); //A using System.Drawing.Drawing2D is required;LinearGradientBrush B3 =NewLinearGradientBrush (Rect, Color.yellow, Color.Black, lineargradientmode.horizontal); G.fillrectangle (B3, rect);

Operating effect:

Third, the conversion of the Axis

The axes in WinForm are different from the plane right angle axes that we normally touch, the axes in the WinForm are exactly the opposite: the upper-left corner of the form is the origin (0,0), the horizontal to the left is X, and the vertical down is Y.

Next , let's do this by rotating the direction of the axis to draw a pattern of different angles , or by changing the position of the coordinate origin to balance the position of the axis .

Graphics g = This. CreateGraphics ();//not here in load, can it be in paint? //Monochrome FillPen p =NewPen (Color.Blue,1); //Change Axis Angle             for(intI=0;i< -; i++) {g.rotatetransform (i); //Rotation AngleG.drawline (P,0,0, -,0);         G.resettransform (); //Reply axis coordinates            }            //panning AxesG.translatetransform ( -, -); G.drawline (P,0,0, -,0);            G.resettransform (); //pan to the specified coordinates and then rotate in degreesG.translatetransform ( -, $);  for(intI=0;i<8; i++) {G.rotatetransform ( $); G.drawline (P,0,0, -,0); } g.dispose ();

Operating effect:

C # GDI + simple Drawing