anulax
/
imgui-docking
1
0
Fork 0
Code Issues Pull Requests Packages project_board Releases Wiki Activity

Demo: added more draw primitives in the Custom Rendering example (#457)

Browse Source
features/sdl_renderer3_multiviewports
ocornut ago%!(EXTRA string=10 years)
parent dc4a07c49a
commit 668a247af0
1 changed files with 75 additions and 46 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 121
      imgui_demo.cpp

121
imgui_demo.cpp
Unescape View File

@ -1763,7 +1763,7 @@ static void ShowExampleAppManipulatingWindowTitle(bool* opened)
static void ShowExampleAppCustomRendering(bool* opened)
{
ImGui::SetNextWindowSize(ImVec2(300,350), ImGuiSetCond_FirstUseEver);
ImGui::SetNextWindowSize(ImVec2(350,560), ImGuiSetCond_FirstUseEver);
if (!ImGui::Begin("Example: Custom rendering", opened))
{
ImGui::End();
@ -1773,59 +1773,88 @@ static void ShowExampleAppCustomRendering(bool* opened)
// Tip: If you do a lot of custom rendering, you probably want to use your own geometrical types and benefit of overloaded operators, etc.
// Define IM_VEC2_CLASS_EXTRA in imconfig.h to create implicit conversions between your types and ImVec2/ImVec4.
// ImGui defines overloaded operators but they are internal to imgui.cpp and not exposed outside (to avoid messing with your types)
// In this example we aren't using the operators.
static ImVector<ImVec2> points;
static bool adding_line = false;
if (ImGui::Button("Clear")) points.clear();
if (points.Size >= 2) { ImGui::SameLine(); if (ImGui::Button("Undo")) { points.pop_back(); points.pop_back(); } }
ImGui::Text("Left-click and drag to add lines");
ImGui::Text("Right-click to undo");
// In this example we are not using the maths operators!
ImDrawList* draw_list = ImGui::GetWindowDrawList();
// Here we are using InvisibleButton() as a convenience to 1) advance the cursor and 2) allows us to use IsItemHovered()
// However you can draw directly and poll mouse/keyboard by yourself. You can manipulate the cursor using GetCursorPos() and SetCursorPos().
// If you only use the ImDrawList API, you can notify the owner window of its extends by using SetCursorPos(max).
ImVec2 canvas_pos = ImGui::GetCursorScreenPos(); // ImDrawList API uses screen coordinates!
ImVec2 canvas_size = ImGui::GetContentRegionAvail(); // Resize canvas to what's available
if (canvas_size.x < 50.0f) canvas_size.x = 50.0f;
if (canvas_size.y < 50.0f) canvas_size.y = 50.0f;
draw_list->AddRectFilledMultiColor(canvas_pos, ImVec2(canvas_pos.x + canvas_size.x, canvas_pos.y + canvas_size.y), ImColor(0,0,0), ImColor(255,0,0), ImColor(255,255,0), ImColor(0,255,0));
draw_list->AddRect(canvas_pos, ImVec2(canvas_pos.x + canvas_size.x, canvas_pos.y + canvas_size.y), ImColor(255,255,255));
draw_list->AddBezierCurve(ImVec2(canvas_pos.x+20,canvas_pos.y+20), ImVec2(canvas_pos.x+100,canvas_pos.y+20), ImVec2(canvas_pos.x+canvas_size.x-100,canvas_pos.y+canvas_size.y-20), ImVec2(canvas_pos.x+canvas_size.x-20,canvas_pos.y+canvas_size.y-20), ImColor(255,200,0), 5.0f);
bool adding_preview = false;
ImGui::InvisibleButton("canvas", canvas_size);
if (ImGui::IsItemHovered())
// Primitives
ImGui::Text("Primitives");
static float sz = 36.0f;
static ImVec4 col = ImVec4(1.0f,1.0f,0.4f,1.0f);
ImGui::DragFloat("Size", &sz, 0.2f, 1.0f, 72.0f, "%.0f");
ImGui::ColorEdit3("Color", &col.x);
{
ImVec2 mouse_pos_in_canvas = ImVec2(ImGui::GetIO().MousePos.x - canvas_pos.x, ImGui::GetIO().MousePos.y - canvas_pos.y);
if (!adding_line && ImGui::IsMouseClicked(0))
{
points.push_back(mouse_pos_in_canvas);
adding_line = true;
}
if (adding_line)
const ImVec2 p = ImGui::GetCursorScreenPos();
const ImU32 col32 = ImColor(col);
float x = p.x + 4.0f, y = p.y + 4.0f, spacing = 8.0f;
draw_list->AddCircle(ImVec2(x+sz*0.5f, y+sz*0.5f), sz*0.5f, col32, 32); x += sz+spacing;
draw_list->AddRect(ImVec2(x, y), ImVec2(x+sz, y+sz), col32); x += sz+spacing;
draw_list->AddRect(ImVec2(x, y), ImVec2(x+sz, y+sz), col32, 10.0f); x += sz+spacing;
draw_list->AddLine(ImVec2(x, y), ImVec2(x+sz, y ), col32); x += sz+spacing;
draw_list->AddLine(ImVec2(x, y), ImVec2(x+sz, y+sz), col32); x += sz+spacing;
draw_list->AddLine(ImVec2(x, y), ImVec2(x, y+sz), col32); x += spacing;
draw_list->AddBezierCurve(ImVec2(x, y), ImVec2(x+sz*1.3f,y+sz*0.3f), ImVec2(x+sz-sz*1.3f,y+sz-sz*0.3f), ImVec2(x+sz, y+sz), col32, 1.0f);
x = p.x + 4;
y += sz+spacing;
draw_list->AddCircleFilled(ImVec2(x+sz*0.5f, y+sz*0.5f), sz*0.5f, col32, 32); x += sz+spacing;
draw_list->AddRectFilled(ImVec2(x, y), ImVec2(x+sz, y+sz), col32); x += sz+spacing;
draw_list->AddRectFilled(ImVec2(x, y), ImVec2(x+sz, y+sz), col32, 10.0f); x += sz+spacing;
draw_list->AddLine(ImVec2(x, y), ImVec2(x+sz, y ), col32, 4.0f); x += sz+spacing;
draw_list->AddLine(ImVec2(x, y), ImVec2(x+sz, y+sz), col32, 4.0f); x += sz+spacing;
draw_list->AddLine(ImVec2(x, y), ImVec2(x, y+sz), col32, 4.0f); x += spacing;
draw_list->AddBezierCurve(ImVec2(x, y), ImVec2(x+sz*1.3f,y+sz*0.3f), ImVec2(x+sz-sz*1.3f,y+sz-sz*0.3f), ImVec2(x+sz, y+sz), col32, 4.0f); x += sz+spacing;
draw_list->AddRectFilledMultiColor(ImVec2(x, y), ImVec2(x+sz, y+sz), ImColor(0,0,0), ImColor(255,0,0), ImColor(255,255,0), ImColor(0,255,0));
ImGui::Dummy(ImVec2((sz+spacing)*8, (sz+spacing)*2));
}
ImGui::Separator();
{
static ImVector<ImVec2> points;
static bool adding_line = false;
ImGui::Text("Canvas example");
if (ImGui::Button("Clear")) points.clear();
if (points.Size >= 2) { ImGui::SameLine(); if (ImGui::Button("Undo")) { points.pop_back(); points.pop_back(); } }
ImGui::Text("Left-click and drag to add lines,\nRight-click to undo");
// Here we are using InvisibleButton() as a convenience to 1) advance the cursor and 2) allows us to use IsItemHovered()
// However you can draw directly and poll mouse/keyboard by yourself. You can manipulate the cursor using GetCursorPos() and SetCursorPos().
// If you only use the ImDrawList API, you can notify the owner window of its extends by using SetCursorPos(max).
ImVec2 canvas_pos = ImGui::GetCursorScreenPos(); // ImDrawList API uses screen coordinates!
ImVec2 canvas_size = ImGui::GetContentRegionAvail(); // Resize canvas to what's available
if (canvas_size.x < 50.0f) canvas_size.x = 50.0f;
if (canvas_size.y < 50.0f) canvas_size.y = 50.0f;
draw_list->AddRectFilledMultiColor(canvas_pos, ImVec2(canvas_pos.x + canvas_size.x, canvas_pos.y + canvas_size.y), ImColor(50,50,50), ImColor(50,50,60), ImColor(60,60,70), ImColor(50,50,60));
draw_list->AddRect(canvas_pos, ImVec2(canvas_pos.x + canvas_size.x, canvas_pos.y + canvas_size.y), ImColor(255,255,255));
bool adding_preview = false;
ImGui::InvisibleButton("canvas", canvas_size);
if (ImGui::IsItemHovered())
{
adding_preview = true;
points.push_back(mouse_pos_in_canvas);
if (!ImGui::GetIO().MouseDown[0])
ImVec2 mouse_pos_in_canvas = ImVec2(ImGui::GetIO().MousePos.x - canvas_pos.x, ImGui::GetIO().MousePos.y - canvas_pos.y);
if (!adding_line && ImGui::IsMouseClicked(0))
{
points.push_back(mouse_pos_in_canvas);
adding_line = true;
}
if (adding_line)
{
adding_preview = true;
points.push_back(mouse_pos_in_canvas);
if (!ImGui::GetIO().MouseDown[0])
adding_line = adding_preview = false;
}
if (ImGui::IsMouseClicked(1) && !points.empty())
{
adding_line = adding_preview = false;
points.pop_back();
points.pop_back();
}
}
if (ImGui::IsMouseClicked(1) && !points.empty())
{
adding_line = adding_preview = false;
draw_list->PushClipRect(ImVec4(canvas_pos.x, canvas_pos.y, canvas_pos.x+canvas_size.x, canvas_pos.y+canvas_size.y)); // clip lines within the canvas (if we resize it, etc.)
for (int i = 0; i < points.Size - 1; i += 2)
draw_list->AddLine(ImVec2(canvas_pos.x + points[i].x, canvas_pos.y + points[i].y), ImVec2(canvas_pos.x + points[i+1].x, canvas_pos.y + points[i+1].y), 0xFF00FFFF, 2.0f);
draw_list->PopClipRect();
if (adding_preview)
points.pop_back();
points.pop_back();
}
}
draw_list->PushClipRect(ImVec4(canvas_pos.x, canvas_pos.y, canvas_pos.x+canvas_size.x, canvas_pos.y+canvas_size.y)); // clip lines within the canvas (if we resize it, etc.)
for (int i = 0; i < points.Size - 1; i += 2)
draw_list->AddLine(ImVec2(canvas_pos.x + points[i].x, canvas_pos.y + points[i].y), ImVec2(canvas_pos.x + points[i+1].x, canvas_pos.y + points[i+1].y), 0xFF00FFFF, 2.0f);
draw_list->PopClipRect();
if (adding_preview)
points.pop_back();
ImGui::End();
}

Write Preview
Loading…
Cancel
Save