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Text is trimmed at the last whole word.
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strFormat.Trimming = StringTrimming.Word
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Text is trimmed at the last visible character,
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and an ellipsis is inserted after it.
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strFormat.Trimming = StringTrimming.EllipsisCharacter
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An ellipsis is used in the center of the string.
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strFormat.Trimming = StringTrimming.EllipsisPath
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The FormatFlags property is a bit-coded field that gives you even more control over how text is printed:
Ensure that only whole lines are displayed. (The last line isn t
displayed if it isn t completely visible in the bounding rectangle.)
strFormat.FormatFlags = StringFormatFlags.LineLimit
Display the text vertically.
strFormat.FormatFlags = StringFormatFlags.DirectionVertical
gr.DrawString(msg, fnt, Brushes.Black, 20, 20, strFormat)
(Note that you can rotate text to any angle by using the RotateTransform method of the Graphics object.) One more thing you can do when displaying text is use tab stops to align columns of data, as in Figure 17-21. You can make tab stops by preparing a string containing tab and carriage-return characters, preparing a Single array that holds the position of each tab stop, and then passing the array to the SetTabStops method of the StringFormat object:
Prepare a message with tabs and carriage returns. Dim msg As String = String.Format( {0}Column 1{0}Column 2{0}Column 3{1} _ & Row 1{0}Cell (1,1){0}Cell (1,2){0}Cell (1,3){1} _ & Row 2{0}Cell (2,1){0}Cell (2,2){0}Cell (3,3){1}", _ ControlChars.Tab, ControlChars.CrLf) Dim fnt As New Font( Arial", 12)
Dim strFormat As New StringFormat()
Set the tab stops.
Dim tabStops() As Single = {80, 140, 200}
strFormat.SetTabStops(0, tabStops)
Draw the text with specified tab stops.
gr.DrawString(msg, fnt, Brushes.Black, 20, 20, strFormat)
Destroy the Font object.
fnt.Dispose()
Figure 17-21 Using tab stops
Anti-Aliasing
Anti-aliasing is a technique that allows you to process graphic output so that lines don t appear jagged. You achieve this smoothing effect by using a color halfway between those
17:
GDI+
of the line and the background. For example, if you draw a jagged black line over a white background, you can smooth it by using gray pixels for the points near the boundary. The small ellipse on the right in Figure 17-22 is the anti-aliased version of the ellipse on the left. It looks better defined, even though you probably can t really say why. But if you enlarge the two ellipses (see bottom part of figure), you see that the anti-aliased version uses gray pixels to smooth its edges.
Figure 17-22
Using anti-aliasing on shapes
GDI+ supports anti-aliasing of both text and shapes. You can choose between two types of smoothing modes: anti-aliasing and high quality. The former works well on any type of display, whereas the latter takes advantage of the subpixel resolution of LCD screens. A pixel on an LCD screen is subdivided into three stripes that can be turned on or off individually, so you can achieve even more refined effects. (This is the smoothing mode used by the Microsoft ClearType display technology.) High-quality mode has no effect on regular CRT displays. Because of the required extra processing time, anti-aliasing is slower than regular display, and high-quality rendering is even slower than standard anti-aliasing. You use two different properties of the Graphics object to activate anti-aliasing, depending on whether you want to smooth lines or text. The SmoothingMode property affects how lines and curves are drawn. For example, this is the code that produces the two ellipses in Figure 17-22:
Draw a first ellipse in regular mode.
gr.DrawEllipse(Pens.Black, 20, 20, 100, 60)
Draw a second ellipse in anti-aliasing mode.
gr.SmoothingMode = Drawing.Drawing2D.SmoothingMode.AntiAlias
gr.DrawEllipse(Pens.Black, 140, 20, 100, 60)
You can further influence graphic anti-aliasing by using the PixelOffsetMode property. (Read the .NET Platform SDK for more details.)
Part IV:
Win32 Applications
Text anti-aliasing is controlled by the TextRenderingHint property. Here s a code exam ple, which produces the result visible in Figure 17-23:
Dim fnt As New Font( Arial", 14)
gr.DrawString( Regular Text", fnt, Brushes.Black, 20, 200)
Standard anti-aliasing
gr.TextRenderingHint = Drawing.Text.TextRenderingHint.AntiAlias
gr.DrawString( Standard Anti-aliasing", fnt, Brushes.Black, 20, 260)
ClearType anti-aliasing
gr.TextRenderingHint = Drawing.Text.TextRenderingHint.ClearTypeGridFit
gr.DrawString( ClearType Anti-aliasing", fnt, Brushes.Black, 20, 320)
Destroy the Font object.
fnt.Dispose()
Figure 17-23 The two flavors of anti-aliasing methods compared with regular text output
Alas, I don t have enough pages to cover all the great features of GDI+, so I have to stop here. For example, I haven t explained transformation matrix objects, graphic con tainers, or advanced color manipulations. However, I believe that you now know enough to leverage the great potential of this portion of the .NET Framework. Now it s time to explore how you can create custom Windows Forms controls.
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