barcode vb.net 2008 Doing More with DISPLAY in Font

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Doing More with DISPLAY
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You re probably thinking what I m thinking, That wasn t that exciting. But remember this: with programming, you have to start somewhere. And, in a few simple steps, you ve now figured out how to add text to the LCD screen for any robot you build in the future. Now, let s look at some of the other things you can do with the DISPLAY block.
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CHAPTER 3 HELLO WORLD!
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Note Every program block has its own unique settings, so each configuration panel is different. Sections for the
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DISPLAY block, for example, include Action, Display, File, Text, Type, and Position. Sometimes, a section will not
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be visible until other options are selected. Don t let this worry you; I ll be going over all the unique items for each block throughout the book.
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The Display section only has one configurable item a Clear checkbox. When this box is checked (and the block is executed in a program), the Brick s LCD screen will be cleared of any text or images that are currently on the screen. After the screen is cleared, the DISPLAY block will put what you configured on the screen. If you leave the box unchecked, any text or graphics you configure the DISPLAY block to put on the LCD will display on the screen along with whatever is currently displayed, instead of replacing it. This is useful when you want text to appear on multiple lines; you can use multiple DISPLAY blocks to keep adding text to make sentences and even paragraphs. Without clearing the screen, you can create your own simple images using the Drawing option in the Action section, which I ll explain next. With the Action section, you have four options in the drop-down menu: Image, Text, Drawing, and Reset. By default, the drop-down menu is set to Image for a new DISPLAY block placed on the work space. When you select Image in the drop-down menu, the File section is displayed; this section gives you access to a collection of small built-in pictures that can be displayed on the LCD screen (see Figure 3-8).
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Note Version 2.0 of the Retail software now comes with an Image Editor that allows you to make your own
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images! I ll cover this feature in Appendix C.
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Figure 3-8. Choose an image from the File section to place on the LCD. By clicking and holding the image in the preview pane on the right side of the configuration panel, you can drag the image around the small pane and place it wherever you wish. You can also use the X and Y coordinates to type in numbers that will place the image at a location of your choosing (see Appendix A for a brief explanation of the X/Y coordinate system if you re unfamiliar with it). You can use this ability to move the image around the preview pane to place multiple images (which require using additional DISPLAY blocks) on the LCD screen. The next option in the Action drop-down menu is Text. You ve already used this in the previous Hello World! example, but I d like to add that you also have the ability to drag the text around the preview pane and place it in a particular location. The LCD screen is broken into eight horizontal lines;
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CHAPTER 3 HELLO WORLD!
you can use the small drop-down box next to the Preview pane to choose a number between 1 and 8 to define the line where text is placed. The third option in the Action drop-down menu is Drawing (see Figure 3-9). You can choose to draw a line or a circle or to place a single point on the LCD screen, so your artistic talents will be somewhat limited. To create a detailed drawing, you would have to place dozens or more DISPLAY blocks one after the other, and the combination of lines, circles, and points would create the image. A better solution (for owners of the 2.0 retail software) is to use the built-in Image Editor that I cover in Appendix C. But the Drawing options are available to 1.0 and 2.0 software owners and are useful for drawing boxes around other text on the screen, so keep that in mind.
Figure 3-9. The Drawing option can be used to place points, lines, and circles. To use the Drawing tool, select Point, Line, or Circle from the Type section (this section only appears if you have selected Drawing in the Action drop-down menu). For the point, you can drag it around the Preview pane and place it anywhere. You can also use the X and Y coordinates to place the point more accurately. For owners of the 1.0 version of the software, if you choose the Line, the end point of the Line is at position 10,10 (in the lower left corner). Click anywhere in the Preview pane to draw a line from that point to the place where you clicked. You can change the end point (10,10) by entering new coordinates in the X and Y boxes. You can also type in X and Y coordinates for the other end of the line for more accurate control over it. For 2.0 owners, the Line tool works similarly. A line is added automatically simply click anywhere in the Preview pane and the line will be redrawn with one of its ends terminating on the spot you clicked. Likewise, you can use the X and Y boxes to manually select a starting point for the line as well as use the End Point X and Y boxes to manually enter an ending point for the line. Finally, for the circle, you have the option of changing the radius of the circle by typing the number in the Radius text box. Drag the circle around the Preview pane to place it properly. Use the X and Y boxes to manually enter the center point of the circle. The final option in the Action drop-down menu, Reset, is useful when you would like to clear the LCD screen of any items. The default NXT screen (which shows the name of the program currently running) will appear on the LCD screen.
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