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AddLineMultiColor #9317

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AddLineMultiColor #9317

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c048c55
Update imgui_draw.cpp
PhillipDaPaster Mar 21, 2026
94974a6
Update imgui.h
PhillipDaPaster Mar 21, 2026
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1 change: 1 addition & 0 deletions imgui.h
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Original file line number Diff line number Diff line change
Expand Up @@ -3318,6 +3318,7 @@ struct ImDrawList
// In future versions we will use textures to provide cheaper and higher-quality circles.
// Use AddNgon() and AddNgonFilled() functions if you need to guarantee a specific number of sides.
IMGUI_API void AddLine(const ImVec2& p1, const ImVec2& p2, ImU32 col, float thickness = 1.0f);
IMGUI_API void AddLineMultiColor(const ImVec2& p1, const ImVec2& p2, ImU32 col_start, ImU32 col_end, float thickness = 1.f);
IMGUI_API void AddRect(const ImVec2& p_min, const ImVec2& p_max, ImU32 col, float rounding = 0.0f, ImDrawFlags flags = 0, float thickness = 1.0f); // a: upper-left, b: lower-right (== upper-left + size)
IMGUI_API void AddRectFilled(const ImVec2& p_min, const ImVec2& p_max, ImU32 col, float rounding = 0.0f, ImDrawFlags flags = 0); // a: upper-left, b: lower-right (== upper-left + size)
IMGUI_API void AddRectFilledMultiColor(const ImVec2& p_min, const ImVec2& p_max, ImU32 col_upr_left, ImU32 col_upr_right, ImU32 col_bot_right, ImU32 col_bot_left);
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37 changes: 37 additions & 0 deletions imgui_draw.cpp
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Expand Up @@ -1493,6 +1493,43 @@ void ImDrawList::AddLine(const ImVec2& p1, const ImVec2& p2, ImU32 col, float th
PathStroke(col, 0, thickness);
}

void ImDrawList::AddLineMultiColor(const ImVec2& p1, const ImVec2& p2, ImU32 col_start, ImU32 col_end, float thickness) {
if ((col_start & IM_COL32_A_MASK) == 0 && (col_end & IM_COL32_A_MASK) == 0)
return;

ImVec2 dir = p2 - p1;
float len = sqrtf(dir.x * dir.x + dir.y * dir.y);
if (len == 0.0f)
return;

dir.x /= len;
dir.y /= len;

ImVec2 perp(-dir.y, dir.x);
perp.x *= thickness * 0.5f;
perp.y *= thickness * 0.5f;

ImVec2 v0 = p1 - perp; // bottom-left
ImVec2 v1 = p2 - perp; // bottom-right
ImVec2 v2 = p2 + perp; // top-right
ImVec2 v3 = p1 + perp; // top-left

PrimReserve(6, 4);
PrimWriteIdx((ImDrawIdx)(_VtxCurrentIdx));
PrimWriteIdx((ImDrawIdx)(_VtxCurrentIdx + 1));
PrimWriteIdx((ImDrawIdx)(_VtxCurrentIdx + 2));
PrimWriteIdx((ImDrawIdx)(_VtxCurrentIdx));
PrimWriteIdx((ImDrawIdx)(_VtxCurrentIdx + 2));
PrimWriteIdx((ImDrawIdx)(_VtxCurrentIdx + 3));

const ImVec2 uv = _Data->TexUvWhitePixel;

PrimWriteVtx(v0, uv, col_start); // bottom-left
PrimWriteVtx(v1, uv, col_end); // bottom-right
PrimWriteVtx(v2, uv, col_end); // top-right
PrimWriteVtx(v3, uv, col_start); // top-left
}

// p_min = upper-left, p_max = lower-right
// Note we don't render 1 pixels sized rectangles properly.
void ImDrawList::AddRect(const ImVec2& p_min, const ImVec2& p_max, ImU32 col, float rounding, ImDrawFlags flags, float thickness)
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