Figure 6-3 Use Graphics.DrawPolygon to create shapes made of multiple lines in C#

Printer QR Code ISO/IEC18004 in C# Figure 6-3 Use Graphics.DrawPolygon to create shapes made of multiple lines

Figure 6-3 Use Graphics.DrawPolygon to create shapes made of multiple lines
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NOTE Horizontal, and then vertical
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When you pass coordinates to any .NET Framework method, you will 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.
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Graphics
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How to Customize Pens
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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:
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' 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); 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);
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Lesson 1: Drawing Graphics
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Figure 6-4 The Pen class provides several dash styles
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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); 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);
6
Graphics
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 child classes:
System.Drawing.Drawing2D.HatchBrush Defines a rectangular brush with a hatch
style, a foreground color, and a background color
System.Drawing.Drawing2D.LinearGradientBrush
Encapsulates a brush with a linear gradient that provides a visually appealing, professional-looking fill
System.Drawing.Drawing2D.PathGradientBrush Provides similar functionality to
LinearGradientBrush; however, you can define a complex fill pattern that fades between multiple points
System.Drawing.SolidBrush
Defines a brush of a single color
System.Drawing.TextureBrush Defines a brush made from an image that can be
tiled across a shape, like a wallpaper design For example, the following code draws a solid maroon, five-sided polygon, as shown in Figure 6-6:
' VB Dim g As Graphics = Me.CreateGraphics Dim b As Brush = New SolidBrush(Color.Maroon) 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)}
Lesson 1: Drawing Graphics
g.FillPolygon(b, points) // C# Graphics g = this.CreateGraphics(); Brush b = new SolidBrush(Color.Maroon); Point[] points = new Point[] {new Point(10, 10), new Point(10, 100), new Point(50, 65), new Point(100, 100), new Point(85, 40)}; g.FillPolygon(b, points);
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