System.Drawing Namespace

Provides access to basic graphics functionality. This namespace includes classes for drawing graphics, managing images, and working with colors, fonts, and visual styles.

Key Classes

• Bitmap Class

  Represents a bitmap image. It provides methods for loading, saving, and manipulating image data.

• Graphics Class

  Provides methods and properties to create custom graphics and perform drawing operations.

• Color Struct

  Represents an RGBA color value.

• Pen Class

  Represents a graphic object used to draw lines and curves.

• Brush Class

  Abstract base class for all brushes, which are used to fill areas of graphics.

• Font Class

  Represents a typographic character collection (a font) with a specific style and size.

• Point Struct

  Represents an ordered pair of x and y coordinates that defines a point.

• Rectangle Struct

  Represents a drawing surface defined by a location and size.

Common Operations

Drawing a Line

Use the Graphics class to draw lines on a surface.

using System.Drawing;

// Assuming 'g' is an instance of the Graphics class
Pen bluePen = new Pen(Color.Blue, 2);
g.DrawLine(bluePen, 10, 10, 100, 100);

Drawing Text

Use the Graphics.DrawString method to render text.

using System.Drawing;

Font arialFont = new Font("Arial", 16);
SolidBrush solidBrush = new SolidBrush(Color.Black);
g.DrawString("Hello, Graphics!", arialFont, solidBrush, new PointF(50, 50));

Working with Images

Load and display images using the Bitmap class.

using System.Drawing;

Bitmap myBitmap = new Bitmap("path/to/your/image.jpg");
g.DrawImage(myBitmap, new Point(10, 10));

Bitmap Class Details

The Bitmap class represents an image object, allowing for pixel-level manipulation.

• Bitmap(string filename): Creates a Bitmap from a file.
• Bitmap(int width, int height): Creates a blank Bitmap with specified dimensions.
• Color GetPixel(int x, int y): Gets the color of the pixel at the specified coordinates.
• void SetPixel(int x, int y, Color color): Sets the color of the pixel at the specified coordinates.
• void Save(string filename): Saves the image to a file.

Graphics Class Details

The Graphics class is the central object for all drawing operations. You typically obtain a Graphics object from a control's CreateGraphics() method or from a Bitmap.

• void DrawLine(Pen pen, Point pt1, Point pt2): Draws a line between two points.
• void DrawRectangle(Pen pen, int x, int y, int width, int height): Draws a rectangle.
• void FillEllipse(Brush brush, int x, int y, int width, int height): Fills an ellipse within a bounding rectangle.
• void DrawImage(Image image, Point point): Draws an image at the specified location.

Color Struct Details

Represents colors using RGBA (Red, Green, Blue, Alpha) values. Provides predefined color constants and methods for color manipulation.

• static Color Red { get; }: Gets a system-defined color.
• static Color FromArgb(int red, int green, int blue): Creates a Color from RGB values.
• static Color FromArgb(int alpha, Color baseColor): Creates a Color with an alpha value applied to a base color.