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Demo: Added color gradient in demo to identify srgb/linear issues better. Tweaks.

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This commit is contained in:
ocornut
2020-02-24 12:44:19 +01:00
parent 0345324646
commit e547f898a9
4 changed files with 28 additions and 27 deletions
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49
imgui_demo.cpp
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@ -4454,16 +4454,37 @@ static void ShowExampleAppCustomRendering(bool* p_open)
if (ImGui::BeginTabBar("##TabBar"))
{
// Primitives
if (ImGui::BeginTabItem("Primitives"))
{
ImGui::PushItemWidth(-ImGui::GetFontSize() * 10);
// Draw gradients
// (note that those are currently exacerbating our sRGB/Linear issues)
ImGui::Text("Gradients");
ImVec2 gradient_size = ImVec2(ImGui::CalcItemWidth(), ImGui::GetFrameHeight());
{
ImVec2 p = ImGui::GetCursorScreenPos();
ImU32 col_a = ImGui::GetColorU32(ImVec4(0.0f, 0.0f, 0.0f, 1.0f));
ImU32 col_b = ImGui::GetColorU32(ImVec4(1.0f, 1.0f, 1.0f, 1.0f));
draw_list->AddRectFilledMultiColor(p, ImVec2(p.x + gradient_size.x, p.y + gradient_size.y), col_a, col_b, col_b, col_a);
ImGui::InvisibleButton("##gradient1", gradient_size);
}
{
ImVec2 p = ImGui::GetCursorScreenPos();
ImU32 col_a = ImGui::GetColorU32(ImVec4(0.0f, 1.0f, 0.0f, 1.0f));
ImU32 col_b = ImGui::GetColorU32(ImVec4(1.0f, 0.0f, 0.0f, 1.0f));
draw_list->AddRectFilledMultiColor(p, ImVec2(p.x + gradient_size.x, p.y + gradient_size.y), col_a, col_b, col_b, col_a);
ImGui::InvisibleButton("##gradient2", gradient_size);
}
// Draw a bunch of primitives
ImGui::Text("All primitives");
static float sz = 36.0f;
static float thickness = 3.0f;
static int ngon_sides = 6;
static bool circle_segments_override = false;
static int circle_segments_override_v = 12;
static ImVec4 colf = ImVec4(1.0f, 1.0f, 0.4f, 1.0f);
ImGui::PushItemWidth(-ImGui::GetFontSize() * 10);
ImGui::DragFloat("Size", &sz, 0.2f, 2.0f, 72.0f, "%.0f");
ImGui::DragFloat("Thickness", &thickness, 0.05f, 1.0f, 8.0f, "%.02f");
ImGui::SliderInt("N-gon sides", &ngon_sides, 3, 12);
@ -4511,26 +4532,6 @@ static void ShowExampleAppCustomRendering(bool* p_open)
draw_list->AddRectFilledMultiColor(ImVec2(x, y), ImVec2(x + sz, y + sz), IM_COL32(0, 0, 0, 255), IM_COL32(255, 0, 0, 255), IM_COL32(255, 255, 0, 255), IM_COL32(0, 255, 0, 255));
ImGui::Dummy(ImVec2((sz + spacing) * 9.8f, (sz + spacing) * 3));
// Draw black and white gradients
static int gradient_steps = 16;
ImGui::Separator();
ImGui::AlignTextToFramePadding();
ImGui::Text("Gradient steps");
ImGui::SameLine(); if (ImGui::RadioButton("16", gradient_steps == 16)) { gradient_steps = 16; }
ImGui::SameLine(); if (ImGui::RadioButton("32", gradient_steps == 32)) { gradient_steps = 32; }
ImGui::SameLine(); if (ImGui::RadioButton("256", gradient_steps == 256)) { gradient_steps = 256; }
ImVec2 gradient_size = ImVec2(ImGui::CalcItemWidth(), 64.0f);
x = ImGui::GetCursorScreenPos().x;
y = ImGui::GetCursorScreenPos().y;
for (int n = 0; n < gradient_steps; n++)
{
float f0 = n / (float)gradient_steps;
float f1 = (n + 1) / (float)gradient_steps;
ImU32 col32 = ImGui::GetColorU32(ImVec4(f0, f0, f0, 1.0f));
draw_list->AddRectFilled(ImVec2(x + gradient_size.x * f0, y), ImVec2(x + gradient_size.x * f1, y + gradient_size.y), col32);
}
ImGui::InvisibleButton("##gradient", gradient_size);
ImGui::PopItemWidth();
ImGui::EndTabItem();
}
@ -4598,9 +4599,9 @@ static void ShowExampleAppCustomRendering(bool* p_open)
ImVec2 window_size = ImGui::GetWindowSize();
ImVec2 window_center = ImVec2(window_pos.x + window_size.x * 0.5f, window_pos.y + window_size.y * 0.5f);
if (draw_bg)
ImGui::GetBackgroundDrawList()->AddCircle(window_center, window_size.x * 0.6f, IM_COL32(255, 0, 0, 200), 48, 10+4);
ImGui::GetBackgroundDrawList()->AddCircle(window_center, window_size.x * 0.6f, IM_COL32(255, 0, 0, 200), 0, 10+4);
if (draw_fg)
ImGui::GetForegroundDrawList()->AddCircle(window_center, window_size.y * 0.6f, IM_COL32(0, 255, 0, 200), 48, 10);
ImGui::GetForegroundDrawList()->AddCircle(window_center, window_size.y * 0.6f, IM_COL32(0, 255, 0, 200), 0, 10);
ImGui::EndTabItem();
}