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System/Libraries/Graphics2D: Fix some line-drawing inaccuracies

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This commit is contained in:
Alec Murphy 2025-04-29 20:18:56 -04:00
parent a23a5ae844
commit 704c3962f5
2 changed files with 17 additions and 14 deletions
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27
System/Libraries/Graphics2D.HC
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@ -713,8 +713,6 @@ U0 Plot2D(Context2D* ctx, I64 x, I64 y,
U0 VLine2D(Context2D* ctx, I64 x, I64 y, I64 y2,
U32 color)
{ // Draw a vertical line.
if (x > ctx->width || y > ctx->height)
return;
if (y2 < y)
return;
while (y < y2 + 1) {
@ -726,22 +724,27 @@ U0 VLine2D(Context2D* ctx, I64 x, I64 y, I64 y2,
U0 HLine2D(Context2D* ctx, I64 x, I64 y, I64 x2,
U32 color)
{ // Draw a horizontal line.
if (!ctx || !ctx->fb || x > ctx->width || y < 0 || y > ctx->height)
return;
if (x2 < x)
return;
I64 width = x2 - x;
MemSetU32(ctx->fb + (y * ctx->width) + x, color,
T(x + width > ctx->width, ctx->width - x, width));
if (y < 0 || y > ctx->height - 1)
return;
if (x > ctx->width - 1)
return;
if (x2 < 0)
return;
I64 min_x = MaxI64(0, x);
I64 max_x = MinI64(ctx->width - 1, x2);
I64 width = (max_x - min_x) + 1;
if (width == 1) {
Plot2D(ctx, x, y, color);
} else {
MemSetU32(ctx->fb + (y * ctx->width) + x, color, width);
}
}
U0 Line2D(Context2D* ctx, I64 x1, I64 y1, I64 x2, I64 y2,
U32 color)
{ // Draw an arbitrary line using Bresenham's algorithm.
x1 = Max(0, x1);
y1 = Max(0, y1);
x2 = Min(ctx->width, x2);
y2 = Min(ctx->height, y2);
if (x1 == x2) {
VLine2D(ctx, x1, y1, y2, color);
return;
@ -977,7 +980,7 @@ U0 Rect2D(Context2D* ctx, I64 x, I64 y, I64 w, I64 h,
{ // Draw a rectangle fill.
I64 i;
for (i = y; i < y + h; i++) {
HLine2D(ctx, x, i, x + w, color);
HLine2D(ctx, x, i, x + w - 1, color);
}
}