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Merge pull request #5042 from Sir-Irk/ImageDrawLineEx_fix

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[rtextures] Fix `ImageDrawLineEx()` line thickness
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Ray
2025-07-14 10:30:34 +02:00
committed by GitHub
parent 20a07a65d7 fce3102f1c
commit f34e240688
1 changed files with 24 additions and 15 deletions
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39
src/rtextures.c
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@@ -3565,34 +3565,43 @@ void ImageDrawLineEx(Image *dst, Vector2 start, Vector2 end, int thick, Color co
int dx = x2 - x1; int dx = x2 - x1;
int dy = y2 - y1; int dy = y2 - y1;
// Draw the main line between (x1, y1) and (x2, y2)
ImageDrawLine(dst, x1, y1, x2, y2, color);
// Determine if the line is more horizontal or vertical // Determine if the line is more horizontal or vertical
if ((dx != 0) && (abs(dy/dx) < 1)) if ((dx != 0) && (abs(dy/dx) < 1))
{ {
// Line is more horizontal // Line is more horizontal
// Calculate half the width of the line
int wy = (thick - 1)*(int)sqrtf((float)(dx*dx + dy*dy))/(2*abs(dx));
// Draw additional lines above and below the main line // How many additional lines to draw
for (int i = 1; i <= wy; i++) int wy = thick - 1;
// Draw the main line and lower half
for (int i = 0; i <= ((wy+1)/2); i++)
{ {
ImageDrawLine(dst, x1, y1 - i, x2, y2 - i, color); // Draw above the main line ImageDrawLine(dst, x1, y1 + i, x2, y2 + i, color);
ImageDrawLine(dst, x1, y1 + i, x2, y2 + i, color); // Draw below the main line }
// Draw the upper half
for (int i = 1; i <= (wy/2); i++)
{
ImageDrawLine(dst, x1, y1 - i, x2, y2 - i, color);
} }
} }
else if (dy != 0) else if (dy != 0)
{ {
// Line is more vertical or perfectly horizontal // Line is more vertical or perfectly horizontal
// Calculate half the width of the line
int wx = (thick - 1)*(int)sqrtf((float)(dx*dx + dy*dy))/(2*abs(dy)); // How many additional lines to draw
int wx = thick - 1;
// Draw additional lines to the left and right of the main line //Draw the main line and right half
for (int i = 1; i <= wx; i++) for (int i = 0; i <= ((wx+1)/2); i++)
{ {
ImageDrawLine(dst, x1 - i, y1, x2 - i, y2, color); // Draw left of the main line ImageDrawLine(dst, x1 + i, y1, x2 + i, y2, color);
ImageDrawLine(dst, x1 + i, y1, x2 + i, y2, color); // Draw right of the main line }
// Draw the left half
for (int i = 1; i <= (wx/2); i++)
{
ImageDrawLine(dst, x1 - i, y1, x2 - i, y2, color);
} }
} }
} }