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Graphics
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Screen Setup
A graphic screen is created in RFO Basic using the " gr.open alpha, red, green, blue {, ShowStatusBar}" function (the alpha parameter is the transparency level, the other colors form the background color of the graphic screen):
gr.open 255, 255, 255, 255 % solid white backgroundTo set the color and fill pattern used to draw graphics, use the " gr.color alpha, red, green, blue, style" function (for style, fill pattern 1=stroke(outline), 2=fill, 3=strokeandfill):
gr.color 255, 0, 0, 255, 0 % 0 transparency blue outlineDrawing Shapes
A number of functions allow you to place various graphic shapes on the screen:
gr.circle Object_number, x, y, radiusgr.line Object_number, x1, y1, x2, y2gr.oval Object_number, left, top, right, bottomgr.poly Object_number, List_pointer {, x, y}gr.rect Object_number, left, top, right, bottomgr.arc Object_number, left, top, right, bottom, start_angle, sweep_angle, fill_modeTo place a 10x15 square at 50 pixels over and 40 pixels down from the left corner of the screen, labeled " rct1":
gr.rect rct1, 50, 40, 60, 15 % left, top, right, and bottom coordinatesModifying Position and other Properties
To change any property (location, size, etc.) of any graphic object, use the gr.modify function. The following code moves the rectangle above 10 pixels to the right (left coordinate from position 50 to 60, right coordinate from 60 to 70):
gr.modify rct1, " left", 60gr.modify rct1, " right", 70Rendering Changes
Changes made to any graphic do not appear on screen until you call the gr.render function. In order to see any changes made to a graphic object, you must do this every time:
gr.renderLooping Graphic Modifications
You can use loops to move objects, using variables for the position values:
for i = 50 to 100 step 1 % move 50 pixels every time through loop gr.modify rct1, " left", i gr.modify rct1, " right", (i + 10) gr.render pause 1 % adjust the animation speed herenextClosing the Graphic Screen
Close the graphic screen using the gr.close function:
gr.closeAn Animated Rectangle
Here's a complete program that puts together everything above to produce an animated rectangle which moves across the screen 50 pixels:
gr.open 255, 255, 255, 255gr.color 255, 0, 0, 255, 0 gr.rect rct1, 50, 40, 60, 15 % remember: left, top, right, bottomgr.render for i = 50 to 100 step 1 gr.modify rct1, " left", i gr.modify rct1, " right", (i + 10) gr.render pause 1nextpause 1000gr.closeSetting Orientation
You can set the orientation of the graphic screen using the gr.orientation function (default=landscape, 0=landscape, 1=portrait, -1=determined by sensor):
gr.orientation 1|
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