Drawing circles with System Drawing

Question

I have this code that draws a Rectangle   Im trying to remake the MS Paint     case  Rectangle                  if  tempDraw    null                                        tempDraw    Bitmap snapshot Clone                        Graphics g   Graphics FromImage tempDraw                       Pen myPen   new Pen foreColor  lineWidth                       g DrawRectangle myPen  x1  y1  x2-x1  y2-y1                       myPen Dispose                        e Graphics DrawImageUnscaled tempDraw  0  0                       g Dispose                        But what if I want to draw a circle  what will change   g DrawRectangle myPen  x1  y1  x2-x1  y2-y1

User · Answer

PictureBox circle   new PictureBox    circle Paint    new PaintEventHandler circle Paint            void circle Paint object sender  PaintEventArgs e                        e Graphics DrawEllipse Pens Red  0  0  30  30

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With this code you can easily draw a circle    C  is great and easy my friend  public partial class Form1   Form     public Form1                 InitializeComponent             private void button1 Click object sender  EventArgs e                Graphics myGraphics   base CreateGraphics            Pen myPen   new Pen Color Red           SolidBrush mySolidBrush   new SolidBrush Color Red           myGraphics DrawEllipse myPen  50  50  150  150

User · Answer

There is no DrawCircle method  use DrawEllipse instead  I have a static class with handy graphics extension methods  The following ones draw and fill circles  They are wrappers around DrawEllipse and FillEllipse   public static class GraphicsExtensions       public static void DrawCircle this Graphics g  Pen pen                                    float centerX  float centerY  float radius                g DrawEllipse pen  centerX - radius  centerY - radius                        radius   radius  radius   radius              public static void FillCircle this Graphics g  Brush brush                                    float centerX  float centerY  float radius                g FillEllipse brush  centerX - radius  centerY - radius                        radius   radius  radius   radius             You can call them like this   g FillCircle myBrush  centerX  centerY  radius   g DrawCircle myPen  centerX  centerY  radius

User · Answer

You ll need to use DrawEllipse if you want to draw a circle using GDI    An example is here  http   www websupergoo com helpig6net source 3-examples 9-drawgdi htm

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You should use DrawEllipse         Summary         Draws an ellipse defined by a bounding rectangle specified by coordinates        for the upper-left corner of the rectangle  a height  and a width        Parameters       pen         System Drawing Pen that determines the color  width          and style of the ellipse          x         The x-coordinate of the upper-left corner of the bounding rectangle that        defines the ellipse          y         The y-coordinate of the upper-left corner of the bounding rectangle that        defines the ellipse          width         Width of the bounding rectangle that defines the ellipse          height         Height of the bounding rectangle that defines the ellipse        Exceptions       System ArgumentNullException         pen is null  public void DrawEllipse Pen pen  int x  int y  int width  int height

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if you want to draw circle on button then this code might be use full    else if you want to draw a circle on other control just change the name of control and also event  like here event button is called  if you want to draw this circle in group box call the Groupbox event    regards       public Form1                 InitializeComponent                private void Form1 Load object sender  EventArgs e                this button1 Location   new Point 108  12             this Paint    new PaintEventHandler Form1 Paint           this button1 Paint    new PaintEventHandler button1 Paint             void button1 Paint object sender  PaintEventArgs e                Graphics g   this button1 CreateGraphics            Pen pen   new Pen Color Red           g DrawEllipse pen  10  10  20  20

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private void DrawEllipseRectangle PaintEventArgs e                        Pen p   new Pen Color Black  3               Rectangle r   new Rectangle 100  100  100  100               e Graphics DrawEllipse p  r                  private void Form1 Paint object sender  PaintEventArgs e                        DrawEllipseRectangle e

User · Answer

Try the DrawEllipse method instead

[c#] Drawing circles with System.Drawing

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