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

imgui_demo.cpp

@@ -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();
 }