Pixel-Composer/scripts/draw_line_px/draw_line_px.gml

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2023-03-07 14:29:47 +01:00
function line_bresenham(arr, x1, y1, x2, y2, oc, nc) {
var dx = abs(x2 - x1);
var dy = abs(y2 - y1);
var ng = 0;
if(dx < dy) {
var x1t = x1;
var x2t = x2;
var dt = dx;
x1 = y1;
y1 = x1t;
x2 = y2;
y2 = x2t;
ng = 1;
dx = dy;
dy = dt;
}
var pk = 2 * dy - dx;
for( var i = 0; i < dx; i++ ) {
if(x1 < x2) x1++;
else x1--;
var cc = merge_color(oc, nc, i / dx);
if (pk < 0) {
if (ng == 0) array_push(arr, [x1, y1, cc]);
else array_push(arr, [y1, x1, cc]);
pk = pk + 2 * dy;
} else {
if(y1 < y2) y1++;
else y1--;
if (ng == 0) array_push(arr, [x1, y1, cc]);
else array_push(arr, [y1, x1, cc]);
pk = pk + 2 * dy - 2 * dx;
}
}
}