Function RenderColorBar

implot3d.cpp:3249–3281

ImVec4 SampleColormap(float t, ImPlot3DColormap cmap) { return ImGui::ColorConvertU32ToFloat4(SampleColormapU32(t, cmap)); }

void RenderColorBar(const ImU32* colors, int size, ImDrawList& DrawList, const ImRect& bounds, bool vert, bool reversed, bool continuous) {
    const int n = continuous ? size - 1 : size;
    ImU32 col1, col2;
    if (vert) {
        const float step = bounds.GetHeight() / n;
        ImRect rect(bounds.Min.x, bounds.Min.y, bounds.Max.x, bounds.Min.y + step);
        for (int i = 0; i < n; ++i) {
            if (reversed) {
                col1 = colors[size - i - 1];
                col2 = continuous ? colors[size - i - 2] : col1;
            } else {
                col1 = colors[i];
                col2 = continuous ? colors[i + 1] : col1;
            }
            DrawList.AddRectFilledMultiColor(rect.Min, rect.Max, col1, col1, col2, col2);
            rect.TranslateY(step);
        }
    } else {
        const float step = bounds.GetWidth() / n;
        ImRect rect(bounds.Min.x, bounds.Min.y, bounds.Min.x + step, bounds.Max.y);
        for (int i = 0; i < n; ++i) {
            if (reversed) {
                col1 = colors[size - i - 1];
                col2 = continuous ? colors[size - i - 2] : col1;
            } else {
                col1 = colors[i];
                col2 = continuous ? colors[i + 1] : col1;
            }
            DrawList.AddRectFilledMultiColor(rect.Min, rect.Max, col1, col2, col2, col1);
            rect.TranslateX(step);
        }
    }
}

bool ColormapSlider(const char* label, float* t, ImVec4* out, const char* format, ImPlot3DColormap cmap) {
    *t = ImClamp(*t, 0.0f, 1.0f);