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

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docking
ocornut 9 years ago
parent dc4a07c49a
commit 668a247af0
1 changed files with 75 additions and 46 deletions
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121
imgui_demo.cpp
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@ -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();
}

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