Demo: Rework Clipping section. Fix for static analysis. Added bindings in Readme.

This commit is contained in:
omar
2020-08-04 12:05:15 +02:00
parent 963839373c
commit db886f3953
5 changed files with 66 additions and 20 deletions

View File

@ -2684,23 +2684,66 @@ static void ShowDemoWindowLayout()
if (ImGui::TreeNode("Clipping"))
{
static ImVec2 size(100, 100), offset(50, 20);
ImGui::TextWrapped(
"On a per-widget basis we are occasionally clipping text CPU-side if it won't fit in its frame. "
"Otherwise we are doing coarser clipping + passing a scissor rectangle to the renderer. "
"The system is designed to try minimizing both execution and CPU/GPU rendering cost.");
static ImVec2 size(100.0f, 100.0f);
static ImVec2 offset(30.0f, 30.0f);
ImGui::DragFloat2("size", (float*)&size, 0.5f, 1.0f, 200.0f, "%.0f");
ImGui::TextWrapped("(Click and drag)");
ImVec2 pos = ImGui::GetCursorScreenPos();
ImVec4 clip_rect(pos.x, pos.y, pos.x + size.x, pos.y + size.y);
ImGui::InvisibleButton("##empty", size);
if (ImGui::IsItemActive() && ImGui::IsMouseDragging(0))
ImGui::TextWrapped("(Click and drag to scroll)");
for (int n = 0; n < 3; n++)
{
offset.x += ImGui::GetIO().MouseDelta.x;
offset.y += ImGui::GetIO().MouseDelta.y;
if (n > 0)
ImGui::SameLine();
ImGui::PushID(n);
ImGui::BeginGroup(); // Lock X position
ImGui::InvisibleButton("##empty", size);
if (ImGui::IsItemActive() && ImGui::IsMouseDragging(ImGuiMouseButton_Left))
{
offset.x += ImGui::GetIO().MouseDelta.x;
offset.y += ImGui::GetIO().MouseDelta.y;
}
const ImVec2 p0 = ImGui::GetItemRectMin();
const ImVec2 p1 = ImGui::GetItemRectMax();
const char* text_str = "Line 1 hello\nLine 2 clip me!";
const ImVec2 text_pos = ImVec2(p0.x + offset.x, p0.y + offset.y);
ImDrawList* draw_list = ImGui::GetWindowDrawList();
switch (n)
{
case 0:
HelpMarker(
"Using ImGui::PushClipRect():\n"
"Will alter ImGui hit-testing logic + ImDrawList rendering.\n"
"(use this if you want your clipping rectangle to affect interactions)");
ImGui::PushClipRect(p0, p1, true);
draw_list->AddRectFilled(p0, p1, IM_COL32(90, 90, 120, 255));
draw_list->AddText(text_pos, IM_COL32_WHITE, text_str);
ImGui::PopClipRect();
break;
case 1:
HelpMarker(
"Using ImDrawList::PushClipRect():\n"
"Will alter ImDrawList rendering only.\n"
"(use this as a shortcut if you are only using ImDrawList calls)");
draw_list->PushClipRect(p0, p1, true);
draw_list->AddRectFilled(p0, p1, IM_COL32(90, 90, 120, 255));
draw_list->AddText(text_pos, IM_COL32_WHITE, text_str);
draw_list->PopClipRect();
break;
case 2:
HelpMarker(
"Using ImDrawList::AddText() with a fine ClipRect:\n"
"Will alter only this specific ImDrawList::AddText() rendering.\n"
"(this is often used internally to avoid altering the clipping rectangle and minimize draw calls)");
ImVec4 clip_rect(p0.x, p0.y, p1.x, p1.y); // AddText() takes a ImVec4* here so let's convert.
draw_list->AddRectFilled(p0, p1, IM_COL32(90, 90, 120, 255));
draw_list->AddText(ImGui::GetFont(), ImGui::GetFontSize(), text_pos, IM_COL32_WHITE, text_str, NULL, 0.0f, &clip_rect);
break;
}
ImGui::EndGroup();
ImGui::PopID();
}
ImGui::GetWindowDrawList()->AddRectFilled(pos, ImVec2(pos.x + size.x, pos.y + size.y), IM_COL32(90, 90, 120, 255));
ImGui::GetWindowDrawList()->AddText(ImGui::GetFont(), ImGui::GetFontSize()*2.0f, ImVec2(pos.x + offset.x, pos.y + offset.y), IM_COL32_WHITE, "Line 1 hello\nLine 2 clip me!", NULL, 0.0f, &clip_rect);
ImGui::TreePop();
}
}