Added ProgressBar() (#333)

imgui.cpp

@@ -6777,6 +6777,41 @@ void ImGui::PlotHistogram(const char* label, float (*values_getter)(void* data,
     PlotEx(ImGuiPlotType_Histogram, label, values_getter, data, values_count, values_offset, overlay_text, scale_min, scale_max, graph_size);
 }
 
+// size_arg (for each axis) < 0.0f: align to end, 0.0f: auto, > 0.0f: specified size
+void ImGui::ProgressBar(float fraction, const ImVec2& size_arg, const char* overlay)
+{
+    ImGuiWindow* window = GetCurrentWindow();
+    if (window->SkipItems)
+        return;
+
+    ImGuiState& g = *GImGui;
+    const ImGuiStyle& style = g.Style;
+
+    ImVec2 pos = window->DC.CursorPos;
+    const ImRect bb(pos, pos + CalcItemSize(size_arg, CalcItemWidth() + style.FramePadding.x*2.0f, g.FontSize + style.FramePadding.y*2.0f));
+    ItemSize(bb, style.FramePadding.y);
+    if (!ItemAdd(bb, NULL))
+        return;
+
+    // Render
+    fraction = ImSaturate(fraction);
+    const ImVec2 fill_br = ImVec2(ImLerp(bb.Min.x, bb.Max.x, fraction), bb.Max.y);
+    RenderFrame(bb.Min, bb.Max, GetColorU32(ImGuiCol_FrameBg), true, style.FrameRounding);
+    RenderFrame(bb.Min, fill_br, GetColorU32(ImGuiCol_PlotHistogram), false, style.FrameRounding);
+
+    // Default displaying the fraction as percentage string, but user can override it
+    char overlay_buf[32];
+    if (!overlay)
+    {
+        ImFormatString(overlay_buf, IM_ARRAYSIZE(overlay_buf), "%.0f%%", fraction*100+0.01f);
+        overlay = overlay_buf;
+    }
+    
+    ImVec2 overlay_size = CalcTextSize(overlay, NULL);
+    if (overlay_size.x > 0.0f)
+        RenderTextClipped(ImVec2(ImClamp(fill_br.x + style.ItemSpacing.x, bb.Min.x, bb.Max.x - overlay_size.x - style.ItemInnerSpacing.x), bb.Min.y), bb.Max, overlay, NULL, &overlay_size, ImGuiAlign_Left|ImGuiAlign_VCenter, &bb.Min, &bb.Max);
+}
+
 bool ImGui::Checkbox(const char* label, bool* v)
 {
     ImGuiWindow* window = GetCurrentWindow();

imgui.h

@@ -265,6 +265,7 @@ namespace ImGui
     IMGUI_API void          PlotLines(const char* label, float (*values_getter)(void* data, int idx), void* data, int values_count, int values_offset = 0, const char* overlay_text = NULL, float scale_min = FLT_MAX, float scale_max = FLT_MAX, ImVec2 graph_size = ImVec2(0,0));
     IMGUI_API void          PlotHistogram(const char* label, const float* values, int values_count, int values_offset = 0, const char* overlay_text = NULL, float scale_min = FLT_MAX, float scale_max = FLT_MAX, ImVec2 graph_size = ImVec2(0,0), int stride = sizeof(float));
     IMGUI_API void          PlotHistogram(const char* label, float (*values_getter)(void* data, int idx), void* data, int values_count, int values_offset = 0, const char* overlay_text = NULL, float scale_min = FLT_MAX, float scale_max = FLT_MAX, ImVec2 graph_size = ImVec2(0,0));
+    IMGUI_API void          ProgressBar(float fraction, const ImVec2& size_arg = ImVec2(-1,0), const char* overlay = NULL);
 
     // Widgets: Drags (tip: ctrl+click on a drag box to input text)
     IMGUI_API bool          DragFloat(const char* label, float* v, float v_speed = 1.0f, float v_min = 0.0f, float v_max = 0.0f, const char* display_format = "%.3f", float power = 1.0f);     // If v_min >= v_max we have no bound

imgui_demo.cpp

@@ -707,13 +707,15 @@ void ImGui::ShowTestWindow(bool* p_opened)
 
     if (ImGui::CollapsingHeader("Graphs widgets"))
     {
+        static bool animate = true;
+        ImGui::Checkbox("Animate", &animate);
+
         static float arr[] = { 0.6f, 0.1f, 1.0f, 0.5f, 0.92f, 0.1f, 0.2f };
         ImGui::PlotLines("Frame Times", arr, IM_ARRAYSIZE(arr));
 
-        static bool pause;
         static ImVector<float> values; if (values.empty()) { values.resize(90); memset(values.Data, 0, values.Size*sizeof(float)); }
         static int values_offset = 0;
-        if (!pause)
+        if (animate)
         {
             static float refresh_time = ImGui::GetTime(); // Create dummy data at fixed 60 hz rate for the demo
             for (; ImGui::GetTime() > refresh_time + 1.0f/60.0f; refresh_time += 1.0f/60.0f)
@@ -724,12 +726,7 @@ void ImGui::ShowTestWindow(bool* p_opened)
                 phase += 0.10f*values_offset;
             }
         }
-        ImGui::PlotLines("##Lines", values.Data, values.Size, values_offset, "avg 0.0", -1.0f, 1.0f, ImVec2(0,80));
-        ImGui::SameLine(0, ImGui::GetStyle().ItemInnerSpacing.x);
-        ImGui::BeginGroup();
-        ImGui::Text("Lines");
-        ImGui::Checkbox("pause", &pause);
-        ImGui::EndGroup();
+        ImGui::PlotLines("Lines", values.Data, values.Size, values_offset, "avg 0.0", -1.0f, 1.0f, ImVec2(0,80));
         ImGui::PlotHistogram("Histogram", arr, IM_ARRAYSIZE(arr), 0, NULL, 0.0f, 1.0f, ImVec2(0,80));
 
         // Use functions to generate output
@@ -747,6 +744,26 @@ void ImGui::ShowTestWindow(bool* p_opened)
         float (*func)(void*, int) = (func_type == 0) ? Funcs::Sin : Funcs::Saw;
         ImGui::PlotLines("Lines", func, NULL, display_count, 0, NULL, -1.0f, 1.0f, ImVec2(0,80));
         ImGui::PlotHistogram("Histogram", func, NULL, display_count, 0, NULL, -1.0f, 1.0f, ImVec2(0,80));
+        ImGui::Separator();
+
+        // Animate a simple progress bar
+        static float progress = 0.0f, progress_dir = 1.0f;
+        if (animate)
+        {
+            progress += progress_dir * 0.4f * ImGui::GetIO().DeltaTime;
+            if (progress >= +1.1f) { progress = +1.1f; progress_dir *= -1.0f; }
+            if (progress <= -0.1f) { progress = -0.1f; progress_dir *= -1.0f; }
+        }
+
+        // Typically we would use ImVec2(-1.0f,0.0f) to use all available width, or ImVec2(width,0.0f) for a specified width. ImVec2(0.0f,0.0f) uses ItemWidth.
+        ImGui::ProgressBar(progress, ImVec2(0.0f,0.0f));
+        ImGui::SameLine(0.0f, ImGui::GetStyle().ItemInnerSpacing.x);
+        ImGui::Text("Progress Bar");
+
+        float progress_saturated = (progress < 0.0f) ? 0.0f : (progress > 1.0f) ? 1.0f : progress;
+        char buf[32];
+        sprintf(buf, "%d/%d", (int)(progress_saturated*1753), 1753);
+        ImGui::ProgressBar(progress, ImVec2(0.f,0.f), buf);
     }
 
     if (ImGui::CollapsingHeader("Layout"))