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[rshapes] Update DrawPolyLinesEx()

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Add support for negative `thick` values. When `thick` is negative, lines are drawn growing outside of the polygon. Also refactored to explicitly use an `outerRadius` variable instead of using `radius` as the outer radius.
This commit is contained in:
Matthew Roush 2026-07-31 14:38:13 -04:00
commit 9eee28864a
1 changed files with 19 additions and 8 deletions
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27
src/rshapes.c
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@ -1292,13 +1292,24 @@ void DrawPolyLines(Vector2 center, int sides, float radius, float rotation, Colo
void DrawPolyLinesEx(Vector2 center, int sides, float radius, float rotation, float thick, Color color)
{
if (thick <= 0.0f) return;
if (sides < 3) sides = 3;
float centralAngle = rotation*DEG2RAD;
float exteriorAngle = 360.0f/(float)sides*DEG2RAD;
float apothem = radius*cosf(DEG2RAD*180.0f/(float)sides);
float innerRadius = fmaxf(0.0f, radius - thick*(radius/apothem));
float outerRadius = 0.0f;
float innerRadius = 0.0f;
if (thick >= 0.0f)
{
outerRadius = radius;
innerRadius = fmaxf(0.0f, radius - thick*(radius/apothem));
}
else
{
thick *= -1.0f;
outerRadius = radius + thick*(radius/apothem);
innerRadius = radius;
}
#if SUPPORT_QUADS_DRAW_MODE
rlSetTexture(GetShapesTexture().id);
@ -1311,7 +1322,7 @@ void DrawPolyLinesEx(Vector2 center, int sides, float radius, float rotation, fl
float nextAngle = centralAngle + exteriorAngle;
rlTexCoord2f(shapeRect.x/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
rlVertex2f(center.x + cosf(centralAngle)*radius, center.y + sinf(centralAngle)*radius);
rlVertex2f(center.x + cosf(centralAngle)*outerRadius, center.y + sinf(centralAngle)*outerRadius);
rlTexCoord2f(shapeRect.x/texShapes.width, shapeRect.y/texShapes.height);
rlVertex2f(center.x + cosf(centralAngle)*innerRadius, center.y + sinf(centralAngle)*innerRadius);
@ -1320,7 +1331,7 @@ void DrawPolyLinesEx(Vector2 center, int sides, float radius, float rotation, fl
rlVertex2f(center.x + cosf(nextAngle)*innerRadius, center.y + sinf(nextAngle)*innerRadius);
rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, shapeRect.y/texShapes.height);
rlVertex2f(center.x + cosf(nextAngle)*radius, center.y + sinf(nextAngle)*radius);
rlVertex2f(center.x + cosf(nextAngle)*outerRadius, center.y + sinf(nextAngle)*outerRadius);
centralAngle = nextAngle;
}
@ -1333,13 +1344,13 @@ void DrawPolyLinesEx(Vector2 center, int sides, float radius, float rotation, fl
rlColor4ub(color.r, color.g, color.b, color.a);
float nextAngle = centralAngle + exteriorAngle;
rlVertex2f(center.x + cosf(nextAngle)*radius, center.y + sinf(nextAngle)*radius);
rlVertex2f(center.x + cosf(centralAngle)*radius, center.y + sinf(centralAngle)*radius);
rlVertex2f(center.x + cosf(nextAngle)*outerRadius, center.y + sinf(nextAngle)*outerRadius);
rlVertex2f(center.x + cosf(centralAngle)*outerRadius, center.y + sinf(centralAngle)*outerRadius);
rlVertex2f(center.x + cosf(centralAngle)*innerRadius, center.y + sinf(centralAngle)*innerRadius);
rlVertex2f(center.x + cosf(centralAngle)*innerRadius, center.y + sinf(centralAngle)*innerRadius);
rlVertex2f(center.x + cosf(nextAngle)*innerRadius, center.y + sinf(nextAngle)*innerRadius);
rlVertex2f(center.x + cosf(nextAngle)*radius, center.y + sinf(nextAngle)*radius);
rlVertex2f(center.x + cosf(nextAngle)*outerRadius, center.y + sinf(nextAngle)*outerRadius);
centralAngle = nextAngle;
}