C # GDI methods for drawing on a control

This article describes a way for C # GDI to draw on a control as an example of drawing rectangles on a chart control and on a form. Share to everyone for your reference. Here's how:

The specific implementation method is not much explained, the note is very detailed, the code is very simple.

The main function code is as follows:

Using system;using system.collections.generic;using system.componentmodel;using system.data;using System.Drawing; Using system.linq;using system.text;using system.windows.forms;using system.io;using System.Configuration;namespace      wfapp2{public partial class Data:form {public data () {InitializeComponent (); Form g = this.      CreateGraphics ();    Chart control g2 = This.chart1.CreateGraphics (); Firstpoint = new Point (0, 0); The 1th public point of the mouse secondpoint = new Point (0, 0);  Mouse 2nd public bool begin = FALSE;    Whether to start drawing rectangles///<summary>///Draw rectangles on from///</summary> Graphics G;    <summary>///Draw a rectangle on the Chart1 control////</summary> Graphics G2; <summary>///press the mouse event on the form///</summary>//<param name= "sender" ></param>///<      param name= "e" ></param> private void Data_mousedown (object sender, MouseEventArgs e) {begin = true; Firstpoint = new Point (e.x, e.y); }///<summary>///On the form the mouse movement starts drawing///</summary>//<param name= "sender" ></param>/ <param name= "E" ></param> private void Data_mousemove (object sender, MouseEventArgs e) {if (Begi N) {//Clears the form drawing surface, which is equivalent to refreshing the form interface once and then redrawing the g.clear (this.        BackColor);        Gets the new lower-right corner coordinate secondpoint = new Point (e.x, e.y);        Get two number of large or small int minX = Math.min (Firstpoint.x, secondpoint.x);        int miny = Math.min (Firstpoint.y, SECONDPOINT.Y);        int MaxX = Math.max (Firstpoint.x, secondpoint.x);        int maxy = Math.max (Firstpoint.y, SECONDPOINT.Y);        Frame G.drawrectangle (New Pen (color.red), MinX, Miny, Maxx-minx, Maxy-miny); Controlpaint.drawreversibleframe (New Rectangle (MinX, Miny, Maxx-minx, Maxy-miny), this.      backcolor,framestyle.dashed); }}///<summary>//Mouse Release stop drawing///</summary>//<param name= "Sender" ></param>//<param name= "E" ></param> private void Data_mouseup (object sender, MouseEventArgs e) {    begin = FALSE;    }///<summary>///To move the mouse drawing on the chart control///</summary>//<param name= "Sender" ></param> <param name= "E" ></param> private void Chart1_mousemove (object sender, MouseEventArgs e) {if      (BEGIN) {//re-draw on chart above, no clear method here, clear clears the entire drawing interface The chart control clears this.        Refresh ();        Gets the new lower-right corner coordinate secondpoint = new Point (e.x, e.y);        int MinX = Math.min (Firstpoint.x, secondpoint.x);        int miny = Math.min (Firstpoint.y, SECONDPOINT.Y);        int MaxX = Math.max (Firstpoint.x, secondpoint.x);        int maxy = Math.max (Firstpoint.y, SECONDPOINT.Y); Draw a rectangle G2.      DrawRectangle (New Pen (color.red), MinX, Miny, Maxx-minx, Maxy-miny);    }}///<summary>//Mouse Release stop drawing///</summary>//<param name= "Sender" ></param> ///<param name= "E" ></param> private void Chart1_mouseup (object sender, MouseEventArgs e) {begin = Fal    Se    }///<summary>///press mouse on the chart control///</summary>//<param name= "Sender" ></param>  <param name= "E" ></param> private void Chart1_mousedown (object sender, MouseEventArgs e) {begin      = true;    Firstpoint = new Point (e.x, e.y); }  }}

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C # GDI methods for drawing on a control

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C # GDI methods for drawing on a control