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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) void DrawPolyLinesEx(Vector2 center, int sides, float radius, float rotation, float thick, Color color)
{ {
if (thick <= 0.0f) return;
if (sides < 3) sides = 3; if (sides < 3) sides = 3;
float centralAngle = rotation*DEG2RAD; float centralAngle = rotation*DEG2RAD;
float exteriorAngle = 360.0f/(float)sides*DEG2RAD; float exteriorAngle = 360.0f/(float)sides*DEG2RAD;
float apothem = radius*cosf(DEG2RAD*180.0f/(float)sides); 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 #if SUPPORT_QUADS_DRAW_MODE
rlSetTexture(GetShapesTexture().id); rlSetTexture(GetShapesTexture().id);
@ -1311,7 +1322,7 @@ void DrawPolyLinesEx(Vector2 center, int sides, float radius, float rotation, fl
float nextAngle = centralAngle + exteriorAngle; float nextAngle = centralAngle + exteriorAngle;
rlTexCoord2f(shapeRect.x/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height); 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); rlTexCoord2f(shapeRect.x/texShapes.width, shapeRect.y/texShapes.height);
rlVertex2f(center.x + cosf(centralAngle)*innerRadius, center.y + sinf(centralAngle)*innerRadius); 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); rlVertex2f(center.x + cosf(nextAngle)*innerRadius, center.y + sinf(nextAngle)*innerRadius);
rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, shapeRect.y/texShapes.height); 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; 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); rlColor4ub(color.r, color.g, color.b, color.a);
float nextAngle = centralAngle + exteriorAngle; float nextAngle = centralAngle + exteriorAngle;
rlVertex2f(center.x + cosf(nextAngle)*radius, center.y + sinf(nextAngle)*radius); rlVertex2f(center.x + cosf(nextAngle)*outerRadius, center.y + sinf(nextAngle)*outerRadius);
rlVertex2f(center.x + cosf(centralAngle)*radius, center.y + sinf(centralAngle)*radius); 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(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)*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; centralAngle = nextAngle;
} }