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ColorPicker: Alpha bar using a checkerboard. (#346)

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omar 2017-07-30 23:11:59 +08:00
parent 3075d8bcd4
commit 3ee969c3e3
1 changed files with 4 additions and 2 deletions
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6
imgui.cpp
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@ -9504,11 +9504,13 @@ bool ImGui::ColorPicker4(const char* label, float col[4], ImGuiColorEditFlags fl
RenderArrowsForVerticalBar(draw_list, ImVec2(bar0_pos_x - 1, bar0_line_y), ImVec2(bars_triangles_half_sz + 1, bars_triangles_half_sz), bars_width + 2.0f); RenderArrowsForVerticalBar(draw_list, ImVec2(bar0_pos_x - 1, bar0_line_y), ImVec2(bars_triangles_half_sz + 1, bars_triangles_half_sz), bars_width + 2.0f);
// Render alpha bar // Render alpha bar
ImU32 col32_no_alpha = ColorConvertFloat4ToU32(ImVec4(col[0], col[1], col[2], 1.0f));
if (alpha_bar) if (alpha_bar)
{ {
float alpha = ImSaturate(col[3]); float alpha = ImSaturate(col[3]);
ImRect bar1_bb(bar1_pos_x, picker_pos.y, bar1_pos_x + bars_width, picker_pos.y + sv_picker_size); ImRect bar1_bb(bar1_pos_x, picker_pos.y, bar1_pos_x + bars_width, picker_pos.y + sv_picker_size);
draw_list->AddRectFilledMultiColor(bar1_bb.Min, bar1_bb.Max, IM_COL32_WHITE, IM_COL32_WHITE, IM_COL32_BLACK, IM_COL32_BLACK); RenderColorRectWithAlphaCheckerboard(bar1_bb.Min, bar1_bb.Max, IM_COL32(0,0,0,0), bar1_bb.GetWidth() / 2.0f, ImVec2(0,0));
draw_list->AddRectFilledMultiColor(bar1_bb.Min, bar1_bb.Max, col32_no_alpha, col32_no_alpha, col32_no_alpha & ~IM_COL32_A_MASK, col32_no_alpha & ~IM_COL32_A_MASK);
float bar1_line_y = (float)(int)(picker_pos.y + (1.0f - alpha) * sv_picker_size + 0.5f); float bar1_line_y = (float)(int)(picker_pos.y + (1.0f - alpha) * sv_picker_size + 0.5f);
RenderFrameBorder(bar1_bb.Min, bar1_bb.Max, 0.0f); RenderFrameBorder(bar1_bb.Min, bar1_bb.Max, 0.0f);
RenderArrowsForVerticalBar(draw_list, ImVec2(bar1_pos_x - 1, bar1_line_y), ImVec2(bars_triangles_half_sz + 1, bars_triangles_half_sz), bars_width + 2.0f); RenderArrowsForVerticalBar(draw_list, ImVec2(bar1_pos_x - 1, bar1_line_y), ImVec2(bars_triangles_half_sz + 1, bars_triangles_half_sz), bars_width + 2.0f);
@ -9525,7 +9527,7 @@ bool ImGui::ColorPicker4(const char* label, float col[4], ImGuiColorEditFlags fl
p.x = ImClamp(p.x, picker_pos.x + 2, picker_pos.x + sv_picker_size - 2); p.x = ImClamp(p.x, picker_pos.x + 2, picker_pos.x + sv_picker_size - 2);
p.y = ImClamp(p.y, picker_pos.y + 2, picker_pos.y + sv_picker_size - 2); p.y = ImClamp(p.y, picker_pos.y + 2, picker_pos.y + sv_picker_size - 2);
float r = value_changed_from_matrix ? 10.0f : 6.0f; float r = value_changed_from_matrix ? 10.0f : 6.0f;
draw_list->AddCircleFilled(p, r, ColorConvertFloat4ToU32(ImVec4(col[0], col[1], col[2], 1.0f)), 12); draw_list->AddCircleFilled(p, r, col32_no_alpha, 12);
draw_list->AddCircle(p, r+1, IM_COL32(128,128,128,255), 12); draw_list->AddCircle(p, r+1, IM_COL32(128,128,128,255), 12);
draw_list->AddCircle(p, r, IM_COL32_WHITE, 12); draw_list->AddCircle(p, r, IM_COL32_WHITE, 12);