Dashes in Visual Studio .NET

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In addition to the ends having special styles, a line can have a dash style, as defined by the DashStyle enumeration, shown in Figure 410
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Figure 410 Examples Using the DashStyle Enumeration
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Each of the lines was created by setting the DashStyle property of the pen The DashStyleCustom value is used to set custom dash and space lengths, where each length is a multiplier of the width For example, the following code draws the increasing length dashes shown in Figure 410 with a constant space length: using( Pen pen = new Pen(ColorBlack, 12) ) { penDashStyle = DashStyleCustom; // Set increasing dashes and constant spaces penDashPattern = new float[] { 1f, 1f, 2f, 1f, 3f, 1f, 4f, 1f, }; gDrawLine( pen, x + 10, y + height*2/3, x + width - 20, y + height*2/3); } If you'd like to exercise more control over your custom dash settings, you can set the DashCap property on the pen to any of the values in the DashCap enumeration, which is a subset of the values in the LineCap enumeration with only Flat (the default), Round, and Triangle To exercise more control over the line itself, in addition to dash settings, you can define compound pens using the CompoundArray property This allows you to provide lines and spaces in parallel to the lines being drawn instead of perpendicularly, as dash settings do For example,Figure 411 was drawn with a pen set up this way: using( Pen pen = new Pen(ColorBlack, 20) ) { // Set percentages of width where line starts, then space starts, // then line starts again, etc in alternating pattern penCompoundArray = new float[] { 00f, 025f, 045f, 055f, 075f, 10f, }; gDrawRectangle(pen, new Rectangle()); }
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Figure 411 A Single Rectangle Drawn with a Pen Using a Compound Array
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Alignments
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Most of the examples, including Figure 411, have shown pens of width greater than 1 When you draw a line of width greater than 1, the question is, where do the extra pixels go above the line being drawn, below it, or somewhere else The default pen alignment is centered , which means that half the width goes inside the shape being drawn and the other half goes outside The alignment can also be inset , which means that the entire width of the pen is inside the shape being drawn, as shown in Figure 412
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Figure 412 Pen Alignment Options
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InFigure 412, both ellipses are drawn using a rectangle of the same dimensions (as shown by the red line), but the different alignments determine where the width of the line is drawn There are actually several values in the PenAlignment enumeration, but only Center and Inset are currently supported, and Inset is used only for closed shapes (an open figure has no "inside")
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Joins
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One final consideration you'll have when drawing figures that have angles is what to do with the line at the angle In Figure 413, the four values in the PenJoin enumeration have been set in the Pen class's LineJoin property before the rectangles were drawn (again, a white line of
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width 1 is used to show the shape being drawn)
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Figure 413 Sample PenJoin Values
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Notice in Figure 413 that each corner provides a different join The one exception is MiterClipped, which changes between Bevel and Miter dynamically based on the angle of the corner and the limit set by the MiterLimit property
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Creating Pens from Brushes
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So far in this section on pens, all the examples have used solid-color pens However, you can also create a pen from a brush For example, Figure 414 shows an image you first encountered in 1: Hello, Windows Forms
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Figure 414 Creating a Pen from a LinearGradientBrush
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The pen used to draw the lines in Figure 414 was created from a LinearGradientBrush: using( LinearGradientBrush brush = new LinearGradientBrush( thisClientRectangle, ColorEmpty, // ignored ColorEmpty, // ignored 45) ) {
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ColorBlend blend = new ColorBlend(); blendColors = new Color[] { ColorRed, ColorGreen, ColorBlue }; blendPositions = new float[] { 0, 5f, 1 }; brushInterpolationColors = blend; using( Pen pen = new Pen(brush) ) { } } The ability to create a pen from a brush lets you use any effect you can create using the multitude of brushes provided by SystemDrawing [ Team LiB ]
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