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Fix aspect ratio #6

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Fix aspect ratio #6

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8 changes: 6 additions & 2 deletions gen_img.c
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Original file line number Diff line number Diff line change
Expand Up @@ -42,9 +42,13 @@ long x1,x2,x3,x4,y1,y2,y3,y4;
double color;
double xcenter, ycenter, width, height;

// Original DOS version targeted 8:5 display (320x200) but also supported 4:3 displays.
// Apply the necessary correction here:
const double aspect_correction = (8.0 / 5.0) / ((double)_width / (double)_height);

if (normalize) {
xcenter = (double)(_xcenter * 320) / _width;
ycenter = (double)(_ycenter * 200) / _height;
ycenter = (double)(_ycenter * 200 * aspect_correction) / _height;
width = (double)320;
height = (double)200;
} else {
Expand Down Expand Up @@ -73,7 +77,7 @@ long x1,x2,x3,x4,y1,y2,y3,y4;
{
#ifdef ENABLE_FLOAT
if (normalize) {
y = (double)(_y * 200) / _height;
y = (double)(_y * 200 * aspect_correction) / _height;
} else {
y = _y;
}
Expand Down