Programming with Visual Basic for Applications in .NET

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37 Programming with Visual Basic for Applications
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rad = ThisDrawing.Utility.GetDistance(cen, prompt2) draw head Set cir = ThisDrawing.ModelSpace.AddCircle(cen, rad) draw smile dStart = 225 * pi / 180 pi / 180 converts to radians DEnd = 315 * pi / 180 Set arc = ThisDrawing.ModelSpace.AddArc(cen, rad / 2, dStart, dEnd) draw eyes cen(0) = cen(0) - rad / 4 cen(1) = cen(1) + rad / 4 Set cir = ThisDrawing.ModelSpace.AddCircle(cen, rad / 8) cen(0) = cen(0) + rad / 2 Set cir = ThisDrawing.ModelSpace.AddCircle(cen, rad / 8)
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5. Change the module name to HappyFace. 6. Choose Save from the VBA IDE Standard toolbar and save the VBA project as ab37-2.dvb in your AutoCAD Bible folder. 7. Return to your drawing and choose Tools Macro Macros. In the Macro dialog box, choose HappyFace and click Run. 8. Respond to the prompts. HappyFace draws the circle with the center point and radius you specify. You don t need to save your drawing. The example given above uses GetDistance rather than GetReal to enable the user to select with the mouse the radius of the circle. The center point you previously selected feeds into the GetDistance function. Also, there are calculations to convert degrees to radians. The location and size of the eyes and smile are relative to the center and radius.
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Creating Dialog Boxes
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One of the main characteristics of VBA is the ease with which you can create dialog boxes to get user input. Whenever you need input that is more complex than you can get using the Get methods, you should use a dialog box. You can also use a dialog box to create a more professional look or for ease of use. When working with a dialog box, you generally create the dialog box first and then attach code to the dialog box buttons. You then use a second module to display the dialog box. Running the second module then controls the entire routine. In VBA, a dialog box is called a user form. To create one, choose Insert UserForm. VBA creates a blank user form that will become your dialog box. Simultaneously, the Toolbox toolbar appears. If this toolbar covers up some other part of your screen, drag it to one side. Your screen looks like Figure 37-7.
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Figure 37-7: The VBA IDE with a blank user form and the Toolbox toolbar
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Understanding the Toolbox toolbar
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The Toolbox toolbar contains the tools you need to create a dialog box. These are the familiar controls you see in the dialog boxes you use all the time, such as text boxes, list boxes, checkboxes, and so on. Figure 37-8 shows the buttons on the Toolbox toolbar, stretched out into one row.
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Select Objects ListBox TextBox
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OptionButton Frame ScrollBar Image Figure 37-8: Use the buttons on the Toolbox toolbar to create dialog boxes.
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37 Programming with Visual Basic for Applications
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Table 37-4 explains the Toolbox toolbar buttons.
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Table 37-4 The Toolbox Toolbar Buttons
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Button Select Objects Label TextBox ComboBox ListBox CheckBox OptionButton ToggleButton Frame CommandButton TabStrip MultiPage ScrollBar SpinButton Image Description Enables the user to select objects Creates a label on the dialog box Enables the user to type in text Combines features of text and list boxes Enables the user to choose from a list Creates a box that can be checked or unchecked Enables the user to choose one option from several possibilities (also called a radio button) Creates an on/off switch Creates a box around a section of the dialog box Creates a button that executes a command, such as OK and Cancel buttons Creates tabs along the top of the dialog box Creates multiple pages Creates a scrollbar Enables the user to specify a number Inserts an image
If you think the Toolbox toolbar has lots of possibilities, right-click the Toolbox toolbar and choose Additional Controls. From the Additional Controls dialog box, you can choose from many more controls.
Changing dialog box properties
Once you have inserted a user form, you should name it. Find the Name property in the Properties window and change it from UserForm1 (the default name) to any useful name you wish. You might find it useful to use the word form in the name. For example, for a routine to draw a circle, you could call the user form formCircle. Figure 37-9 shows the property box when you insert a user form. You can easily change the dialog box s properties in the property box.