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fix ImageDrawLineEx to be able to draw even numbered thicknesses

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sir-irk
2025-07-13 22:37:41 -05:00
parent 20a07a65d7
commit 0c69c43c3a
1 changed files with 18 additions and 13 deletions
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31
src/rtextures.c
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@@ -3565,34 +3565,39 @@ void ImageDrawLineEx(Image *dst, Vector2 start, Vector2 end, int thick, Color co
int dx = x2 - x1;
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
if ((dx != 0) && (abs(dy/dx) < 1))
{
// 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));
int wy = thick - 1;
// Draw additional lines above and below the main line
for (int i = 1; i <= wy; i++)
//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 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); // Draw above the main line
ImageDrawLine(dst, x1, y1 + i, x2, y2 + i, color); // Draw below the main line
}
}
else if (dy != 0)
{
// 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));
int wx = thick - 1;
// Draw additional lines to the left and right of the main line
for (int i = 1; i <= wx; i++)
//Draw the main line and right half
for (int i = 0; i <= ((wx+1)/2); i++)
{
ImageDrawLine(dst, x1 + i, y1, x2 + i, y2, color); // Draw right of the main line
}
//Draw the the left half
for (int i = 1; i <= (wx/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); // Draw right of the main line
}
}
}