To draw a bitmap on a graphics surface, use the Graphics object s DrawImage method. in VB.NET

Painting QR Code ISO/IEC18004 in VB.NET To draw a bitmap on a graphics surface, use the Graphics object s DrawImage method.

To draw a bitmap on a graphics surface, use the Graphics object s DrawImage method.
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e.Graphics.DrawImage(niceImage, leftOffset, topOffset)
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18: User Interface
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That statement draws the image to the graphics surface as is, but that s kind of boring. You can stretch and crop the image as you draw it, or even generate a thumbnail. I ll try all these methods using the image from the Library Project s splash welcome form (SplashImage.jpg).
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Dim splashImage As New Bitmap("SplashImage.jpg") ' ----- Draw it at half width and height. e.Graphics.DrawImage(splashImage, New RectangleF(10, 50, _ splashImage.Width / 2, splashImage.Height / 2)) ' ----- Stretch it with fun! e.Graphics.DrawImage(splashImage, New RectangleF(200, 10, _ splashImage.Width * 1.25, splashImage.Height / 4)) ' ----- Draw the middle portion. e.Graphics.DrawImage(splashImage, 200, 100, New RectangleF( _ 0, splashImage.Height / 3, splashImage.Width, _ splashImage.Height / 2), GraphicsUnit.Pixel)
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Figure 18-8 shows the output for the previous block of code. But that s not all the drawing you can do. The DrawImage method includes 30 overloads. That would keep me busy for 37 minutes at least!
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OK, we ve covered most of the basic GDI+ features used to draw images. Now it s all just a matter of issuing the drawing commands for shapes, images, and text on a graphics surface. Most of the time, you ll stick with the methods included on the Graphics object, all 12 bazillion of them. Perhaps I overcounted, but there are quite a few. Here s just a sampling:
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Clear method. Clear the background with a specific color. CopyFromScreen method. If the Prnt Scrn button on your keyboard falls off, this is the method for you. DrawArc method. Draw a portion of an arc along the edge of an ellipse. Zero degrees starts at three o clock. Positive arc sweep values move in a clockwise direction; use negative sweep values to move counterclockwise. DrawBezier and DrawBeziers methods. Draw a B zier spline, a formula-based curve that uses a set of points, plus directionals that guide the curve through the points. DrawCurve, DrawClosedCurve, and FillClosedCurve methods. Draw cardinal curves (where points define the path of the curve), with an optional brush fill. DrawEllipse and FillEllipse methods. Draw an ellipse or a circle (which is a variation of an ellipse). DrawIcon, icons. DrawLine and DrawLines methods. Draw one or more lines with lots of options for making the lines snazzy. DrawPath and FillPath methods. I ll discuss graphic paths a little later. DrawPie and FillPie methods. Draw a pie slice border along the edge of an ellipse. DrawPolygon and FillPolygon methods. Draw a regular or irregular geometric shape based on a set of points. DrawRectangle, DrawRectangles, FillRectangle, and FillRectangles methods. Draw squares and rectangles. DrawString method. We used this before to output text to the canvas. FillRegion method. I ll discuss regions later in the chapter. Here s some sample drawing code:
' ----- Line from (10, 10) to (40, 40). e.Graphics.DrawLine(Pens.Black, 10, 10, 40, 40) ' ----- 90degree clockwise arc for 40-pixel diameter circle. e.Graphics.DrawArc(Pens.Black, 50, 10, 40, 40, 0, -90) ' ----- Filled 40x40 rectangle with a dashed line. e.Graphics.FillRectangle(Brushes.Honeydew, 120, 10, 40, 40) Using dashedPen As New Pen(Color.Black, 2) dashedPen.DashStyle = Drawing2D.DashStyle.Dash e.Graphics.DrawRectangle(dashedPen, 120, 10, 40, 40) End Using
DrawIconUnstretched, DrawImage, DrawImageUnscaled, and DrawImageUnscaledAndClipped methods. Different ways of drawing images and
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18: User Interface
' ----- A slice of elliptical pie. e.Graphics.FillPie(Brushes.BurlyWood, 180, 10, 80, 40, _ 180, 120)
And so on. You get the idea. Figure 18-9 shows the output for this code.
Paths: Drawings on Macro-Vision
The GraphicsPath class lets you collect several of the more primitive drawing objects (such as lines and arcs, and even rectangles) into a single grouped unit. This full path can then be replayed onto a graphics surface as a macro.
Using thePath As New Drawing2D.GraphicsPath thePath.AddEllipse(0, 0, 50, 50) thePath.AddArc(10, 30, 30, 10, 10, 160) thePath.AddRectangle(New Rectangle(15, 15, 5, 5)) thePath.AddRectangle(New Rectangle(30, 15, 5, 5)) e.Graphics.DrawPath(Pens.Black, thePath) End Using
This code block draws a smiley face on the canvas (see Figure 18-10).
That s cute. Fortunately, there are other uses for graphics paths, some of which I ll discuss in the next section.
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