The Default GDI+ Coordinate System in VS .NET

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222 The Default GDI+ Coordinate System
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Unlike the Cartesian coordinate system, the default GDI+ coordinate system starts with the origin in the upper left corner The default x-axis points to the right, and the y-axis points down As Figure 23 shows, the upper left corner starts with pointsx = 0 and y = 0 Points to the left of x = 0 are negative values in thex-direction, and points above y = 0 are negative values in they-direction
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Figure 23 The GDI+ coordinate system
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Because the default GDI+ coordinate system starts with (x = 0, y = 0) in the upper left corner of the screen, by default you can see only the points that have positive x and y values Objects with either or y values will not be visible on the screen However, you can apply x transformations to move objects with negative values into the visible area GDI+ provides three types of coordinate systems: world coordinates, page coordinates, and device coordinates 1 The coordinate system used in an application is called world coordinates Suppose that your application draws a line from point A (0, 0) to point B (120, 80), as shown in Figure 24 If you don't apply any transformation, the line will be displayed at the right location Now suppose you want to draw a line from point A ( 40, 50) to point B ( 10, 20) The line drawn using these two points will not be displayed on the screen because the GDI+ coordinate system starts at point (0, 0) However, you can transform the coordinates such that ( 40, 50) is the starting point at the top left corner of the surface
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Figure 24 Drawing a line from point (0, 0) to point (120, 80)
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The new coordinate system is called page coordinates The process of converting world coordinates to page coordinates is called the world transformation You can also control the actual size of graphics objects For example, if you want to draw a line in inches instead of pixels, you can simply draw a line from point A (1, 1) to point B (1, 2), thereby creating a line that is 1 inch long The new coordinates are called device coordinates The process of converting page coordinates to device coordinates is called thepage transformation
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We will discuss coordinate systems and transformation in more detail in 10
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23 Tutorial: Your First GDI+ Application
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In this section you'll learn how to write your first GDI+ application, step-by-step You will create a Windows application and draw a few simple objects, such as lines, rectangles, and ellipses, on a Windows Form Here are the steps we will cover: 1 2 3 4 5 6 7 Creating a Windows application Adding references to the GDI+ library Obtaining the graphics surface Setting the graphics surface properties (optional) Drawing or filling graphics shapes Releasing objects Building and running the application
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231 Creating a Windows Application
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The first step of this tutorial is to create a Windows application using Visual Studio NET
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1 Open Visual Studio NET, select File | New | Project, and then choose Visual C# Projects under Project Types and Windows Application under Templates, as shown in Figure 25
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Figure 25 Creating a Windows application
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Enter the application name, "FirstGDI+App", and click OK
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Clicking the OK button creates a Windows application with a form and opens the Form Designer, in which you can build Windows applications
232 Adding a Reference to GDI+
As mentioned in 1, GDI+ functionality resides in the SystemDrawingdll namespace and is defined in theSystemDrawing namespace Hence the SystemDrawing namespace must be included in the application Visual Studio NET automatically adds a reference to this namespace, which you can see in the beginning of the class If the namespace is not defined there, you must add a reference manually To add a reference to the GDI+ library, you use the Add Reference dialog
1 2 3
Open the Add Reference dialog by selectingProject | Add Reference Select the SystemDrawingdll assembly from the libraries listed under the NET tab Click the Select button to add the library to the Selected Components list, as shown in Figure 26