Quantum Data 801GC, 801GF, 801GX manual Triangle Red50 10 5 10 25 40 15

a series of joined filled triangles. The following example draws a 50% red filled triangle that looks like an arrowhead pointing to the right near the top left corner of active video:

Triangle Red50 10 5 10 25 40 15 1

The Format primitive shows some basic information about the format that is driving the display. The first line shows the number of horizontal active pixels and vertical active lines. The last number on the line shows the number of fields per frame (1 for non-interlaced and 2 for interlaced). The second line shows the horizontal rate and the third line shows the vertical rate. The text is on a black rectangular background with a single pixel border.

The primitive uses three (3) parameters. The first is the color of the text and border. The next two pa- rameters are the X and Y coordinates for the top left-hand corner of the block of text. The following example draws a blue block format data block 30 pixels to the right and 200 pixels below the top left corner of active video:

Format Blue 30 200

The Hatch_I-O primitive draws a crosshatch from the “Inside-Out” of a given color and forming a given number of boxes in each direction. The primitive always has center lines that divide the active video exactly in half in each direction. The vertical center line is 2 pixels thick if the format has an even num- ber of active pixels. The horizontal center line is 2 pixels thick if the format has an even number of active lines. All other lines are 1 pixel thick. If an odd number of boxes is entered for a given direc- tion, a half box will be placed at each end of the crosshatch. All of the lines, in a given direction, are equally spaced. Any remaining pixels are distrib- uted as equally as possible around the perimeter of the grid. This may cause the first and last lines in each direction not to be at the very edges of video. This may also cause any half boxes to be slightly

6-32 Chapter 6: Programming Model 801GC, 801GF & 801GX¥Rev. A