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ColorPicker4: hue/alpha bars draw arrows that would look right on all background. RenderArrow helper. (#346)

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omar
2017-07-30 16:15:52 +08:00
parent 35186a1165
commit fef8aac523
3 changed files with 34 additions and 5 deletions
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28
imgui.cpp
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@@ -9329,6 +9329,26 @@ bool ImGui::ColorPicker3(const char* label, float col[3], ImGuiColorEditFlags fl
return true;
}
// 'pos' is position of the arrow tip. half_sz.x is length from base to tip. half_sz.y is length on each side.
static void RenderArrow(ImDrawList* draw_list, ImVec2 pos, ImVec2 half_sz, ImGuiDir direction, ImU32 col)
{
switch (direction)
{
case ImGuiDir_Right: draw_list->AddTriangleFilled(ImVec2(pos.x - half_sz.x, pos.y + half_sz.y), ImVec2(pos.x - half_sz.x, pos.y - half_sz.y), pos, col); return;
case ImGuiDir_Left: draw_list->AddTriangleFilled(ImVec2(pos.x + half_sz.x, pos.y - half_sz.y), ImVec2(pos.x + half_sz.x, pos.y + half_sz.y), pos, col); return;
case ImGuiDir_Down: draw_list->AddTriangleFilled(ImVec2(pos.x - half_sz.x, pos.y - half_sz.y), ImVec2(pos.x + half_sz.x, pos.y - half_sz.y), pos, col); return;
case ImGuiDir_Up: draw_list->AddTriangleFilled(ImVec2(pos.x + half_sz.x, pos.y + half_sz.y), ImVec2(pos.x - half_sz.x, pos.y + half_sz.y), pos, col); return;
}
}
static void RenderArrowsForVerticalBar(ImDrawList* draw_list, ImVec2 pos, ImVec2 half_sz, float bar_w)
{
RenderArrow(draw_list, ImVec2(pos.x + half_sz.x + 1, pos.y), ImVec2(half_sz.x + 2, half_sz.y + 1), ImGuiDir_Right, IM_COL32_BLACK);
RenderArrow(draw_list, ImVec2(pos.x + half_sz.x, pos.y), half_sz, ImGuiDir_Right, IM_COL32_WHITE);
RenderArrow(draw_list, ImVec2(pos.x + bar_w - half_sz.x - 1, pos.y), ImVec2(half_sz.x + 2, half_sz.y + 1), ImGuiDir_Left, IM_COL32_BLACK);
RenderArrow(draw_list, ImVec2(pos.x + bar_w - half_sz.x, pos.y), half_sz, ImGuiDir_Left, IM_COL32_WHITE);
}
// ColorPicker
// Note: only access 3 floats if ImGuiColorEditFlags_NoAlpha flag is set.
// FIXME: we adjust the big color square height based on item width, which may cause a flickering feedback loop (if automatic height makes a vertical scrollbar appears, affecting automatic width..)
@@ -9351,10 +9371,10 @@ bool ImGui::ColorPicker4(const char* label, float col[4], ImGuiColorEditFlags fl
bool alpha_bar = (flags & ImGuiColorEditFlags_AlphaBar) && !(flags & ImGuiColorEditFlags_NoAlpha);
ImVec2 picker_pos = window->DC.CursorPos;
float bars_width = ColorSquareSize(); // Arbitrary smallish width of Hue/Alpha picking bars
float bars_line_extrude = ImMin(2.0f, style.ItemInnerSpacing.x * 0.5f);
float sv_picker_size = ImMax(bars_width * 1, CalcItemWidth() - (alpha_bar ? 2 : 1) * (bars_width + style.ItemInnerSpacing.x)); // Saturation/Value picking box
float bar0_pos_x = picker_pos.x + sv_picker_size + style.ItemInnerSpacing.x;
float bar1_pos_x = bar0_pos_x + bars_width + style.ItemInnerSpacing.x;
float bars_triangles_half_sz = (float)(int)(bars_width * 0.20f);
float H,S,V;
ColorConvertRGBtoHSV(col[0], col[1], col[2], H, S, V);
@@ -9476,17 +9496,17 @@ bool ImGui::ColorPicker4(const char* label, float col[4], ImGuiColorEditFlags fl
}
float bar0_line_y = (float)(int)(picker_pos.y + H * sv_picker_size + 0.5f);
RenderFrameBorder(ImVec2(bar0_pos_x, picker_pos.y), ImVec2(bar0_pos_x + bars_width, picker_pos.y + sv_picker_size), 0.0f);
draw_list->AddLine(ImVec2(bar0_pos_x - bars_line_extrude, bar0_line_y), ImVec2(bar0_pos_x + bars_width + bars_line_extrude, bar0_line_y), IM_COL32_WHITE);
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
if (alpha_bar)
{
float alpha = ImSaturate(col[3]);
float bar1_line_y = (float)(int)(picker_pos.y + (1.0f - alpha) * sv_picker_size + 0.5f);
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);
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);
draw_list->AddLine(ImVec2(bar1_pos_x - bars_line_extrude, bar1_line_y), ImVec2(bar1_pos_x + bars_width + bars_line_extrude, bar1_line_y), IM_COL32_WHITE);
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);
}
// Render color matrix