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Altera_Forum's avatar
Altera_Forum
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14 years ago

how to draw a line on vga ?

how to draw a line between two point on VGA ( verilog code ) . when i click two point by mouse (ps2) on vga , it will auto connect between two . please give me your idea . thanks!
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

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Hi,

The common way is to draw on memory then display with a VGA from mem IP.

Yet, you can draw directly with X,Y counters of the VGA output and conditioning the output:

if(X == 5)RGBOut = color1;

if(Y == 10)RGBOut = color2;

and it gets more complicated for diagonals that would need raterisation.

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thanks you so much ! but , i have edited my answer ..... please