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Graphics
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The Graphics.DrawLines, Graphics.DrawPolygon, and Graphics.DrawRectangles methods accept arrays as parameters to allow you to create more complex shapes. For example, the following code draws a purple, five-sided polygon, as shown in Figure 6-3:
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' VB Dim g As Graphics = Me.CreateGraphics Dim p As Pen = New Pen(Color.MediumPurple, 2) ' Create an array of points Dim points As Point() = New Point() {New Point(10, 10), _ New Point(10, 100), _ New Point(50, 65), _ New Point(100, 100), _ New Point(85, 40)} ' Draw a shape defined by the array of points g.DrawPolygon(p, points) // C# Graphics g = this.CreateGraphics(); Pen p = new Pen(Color.MediumPurple, 2); // Create an array of points Point[] points = new Point[] {new Point(10, 10), new Point(10, 100), new Point(50, 65), new Point(100, 100), new Point(85, 40)}; // Draw a shape defined by the array of points g.DrawPolygon(p, points);
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Figure 6-3
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Use Graphics.DrawPolygon to create shapes made of multiple lines
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Lesson 1: Drawing Graphics
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NOTE
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Horizontal, Then Vertical
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When you pass coordinates to any .NET Framework method, you pass the horizontal (x) coordinate first, and then the vertical (y) coordinate second. In a 100-by-100 pixel image, (0,0) is the upper-left corner, (100,0) is the upper-right corner, (0, 100) is the lower-left corner, and (100,100) is the lower-right corner.
How to Customize Pens
Besides controlling the color and size of a pen, which are specified in the Pen constructor, you can also control the pattern and endcaps. The endcaps are the ends of the line, and you can use them to create arrows and other special effects. By default, pens draw solid lines. To draw a dotted line, create an instance of the Pen class, and then set the Pen.DashStyle property to one of these values: DashStyle.Dash, DashStyle.DashDot, DashStyle.DashDotDot, DashStyle.Dot, or DashStyle.Solid. The following code, which requires the System.Drawing.Drawing2D namespace, demonstrates each of these pen styles and creates the result shown in Figure 6-4:
' VB Dim g As Graphics = Me.CreateGraphics Dim p As Pen = New Pen(Color.Red, 7) p.DashStyle = DashStyle.Dot g.DrawLine(p, 50, 25, 400, 25) p.DashStyle = DashStyle.Dash g.DrawLine(p, 50, 50, 400, 50) p.DashStyle = DashStyle.DashDot g.DrawLine(p, 50, 75, 400, 75) p.DashStyle = DashStyle.DashDotDot g.DrawLine(p, 50, 100, 400, 100) p.DashStyle = DashStyle.Solid g.DrawLine(p, 50, 125, 400, 125) // C# Graphics g = this.CreateGraphics(); Pen p = new Pen(Color.Red, 7); p.DashStyle = DashStyle.Dot; g.DrawLine(p, 50, 25, 400, 25); p.DashStyle = DashStyle.Dash; g.DrawLine(p, 50, 50, 400, 50);
6
Graphics
p.DashStyle = DashStyle.DashDot; g.DrawLine(p, 50, 75, 400, 75); p.DashStyle = DashStyle.DashDotDot; g.DrawLine(p, 50, 100, 400, 100); p.DashStyle = DashStyle.Solid; g.DrawLine(p, 50, 125, 400, 125);
Figure 6-4
The Pen class provides several dash styles
You can also use the Pen.DashOffset and Pen.DashPattern properties to define a custom dash pattern. To control the endcaps and create arrows or callouts, modify the Pen.StartCap and Pen.EndCap properties using the LineCap enumeration. The following code demonstrates most of the pen cap styles and creates the result shown in Figure 6-5:
' VB Dim g As Graphics = Me.CreateGraphics Dim p As Pen = New Pen(Color.Red, 10) p.StartCap = LineCap.ArrowAnchor p.EndCap = LineCap.DiamondAnchor g.DrawLine(p, 50, 25, 400, 25) p.StartCap = LineCap.SquareAnchor p.EndCap = LineCap.Triangle g.DrawLine(p, 50, 50, 400, 50) p.StartCap = LineCap.Flat p.EndCap = LineCap.Round g.DrawLine(p, 50, 75, 400, 75) p.StartCap = LineCap.RoundAnchor p.EndCap = LineCap.Square g.DrawLine(p, 50, 100, 400, 100) // C# Graphics g = this.CreateGraphics(); Pen p = new Pen(Color.Red, 10);
Lesson 1: Drawing Graphics
p.StartCap = LineCap.ArrowAnchor; p.EndCap = LineCap.DiamondAnchor; g.DrawLine(p, 50, 25, 400, 25); p.StartCap = LineCap.SquareAnchor; p.EndCap = LineCap.Triangle; g.DrawLine(p, 50, 50, 400, 50); p.StartCap = LineCap.Flat; p.EndCap = LineCap.Round; g.DrawLine(p, 50, 75, 400, 75); p.StartCap = LineCap.RoundAnchor; p.EndCap = LineCap.Square; g.DrawLine(p, 50, 100, 400, 100);
Figure 6-5
The Pen class provides options for startcaps and endcaps
How to Fill Shapes
For most of the Draw methods, the Graphics class also has Fill methods that draw a shape and fill in the contents. These methods work exactly like the Draw methods, except they require an instance of the Brush class instead of the Pen class. The Brush class is abstract, so you must instantiate one of the following child classes:
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