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228 lines
9.3 KiB
228 lines
9.3 KiB
/*******************************************************************************************
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*
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* raylib [shapes] example - pie chart
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*
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* Example complexity rating: [★☆☆☆] 1/4
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*
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* Example originally created with raylib 5.5, last time updated with raylib 5.6
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*
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* Example contributed by Gideon Serfontein (@GideonSerf) and reviewed by Ramon Santamaria (@raysan5)
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*
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* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
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* BSD-like license that allows static linking with closed source software
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*
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* Copyright (c) 2025 Gideon Serfontein (@GideonSerf)
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*
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********************************************************************************************/
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#include "raylib.h"
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#include <math.h>
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#include <stdio.h>
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#define RAYGUI_IMPLEMENTATION
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#include "raygui.h"
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#define MAX_PIE_SLICES 10 // Max pie slices
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//------------------------------------------------------------------------------------
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// Program main entry point
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//------------------------------------------------------------------------------------
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int main(void)
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{
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// Initialization
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//--------------------------------------------------------------------------------------
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const int screenWidth = 800;
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const int screenHeight = 450;
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InitWindow(screenWidth, screenHeight, "raylib [shapes] example - pie chart");
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int sliceCount = 7;
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float donutInnerRadius = 25.0f;
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float values[MAX_PIE_SLICES] = { 300.0f, 100.0f, 450.0f, 350.0f, 600.0f, 380.0f, 750.0f }; // Initial slice values
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char labels[MAX_PIE_SLICES][32] = { 0 };
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bool editingLabel[MAX_PIE_SLICES] = { 0 };
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for (int i = 0; i < MAX_PIE_SLICES; i++)
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snprintf(labels[i], 32, "Slice %02i", i + 1);
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bool showValues = true;
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bool showPercentages = false;
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bool showDonut = false;
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int hoveredSlice = -1;
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Rectangle scrollPanelBounds = {0};
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Vector2 scrollContentOffset = {0};
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Rectangle view = { 0 };
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// UI layout parameters
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const int panelWidth = 270;
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const int panelMargin = 5;
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// UI Panel top-left anchor
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const Vector2 panelPos = {
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(float)screenWidth - panelMargin - panelWidth,
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(float)panelMargin
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};
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// UI Panel rectangle
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const Rectangle panelRect = {
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panelPos.x, panelPos.y,
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(float)panelWidth,
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(float)screenHeight - 2.0f*panelMargin
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};
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// Pie chart geometry
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const Rectangle canvas = { 0, 0, panelPos.x, (float)screenHeight };
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const Vector2 center = { canvas.width/2.0f, canvas.height/2.0f};
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const float radius = 205.0f;
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// Total value for percentage calculations
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float totalValue = 0.0f;
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SetTargetFPS(60);
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//--------------------------------------------------------------------------------------
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// Main game loop
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while (!WindowShouldClose())
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{
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// Update
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//----------------------------------------------------------------------------------
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// Calculate total value for percentage calculations
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totalValue = 0.0f;
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for (int i = 0; i < sliceCount; i++) totalValue += values[i];
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// Check for mouse hover over slices
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hoveredSlice = -1; // Reset hovered slice
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Vector2 mousePos = GetMousePosition();
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if (CheckCollisionPointRec(mousePos, canvas)) // Only check if mouse is inside the canvas
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{
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float dx = mousePos.x - center.x;
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float dy = mousePos.y - center.y;
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float distance = sqrtf(dx*dx + dy*dy);
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if (distance <= radius) // Inside the pie radius
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{
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float angle = atan2f(dy, dx)*RAD2DEG;
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if (angle < 0) angle += 360;
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float currentAngle = 0.0f;
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for (int i = 0; i < sliceCount; i++)
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{
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float sweep = (totalValue > 0)? (values[i]/totalValue)*360.0f : 0.0f;
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if ((angle >= currentAngle) && (angle < (currentAngle + sweep)))
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{
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hoveredSlice = i;
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break;
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}
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currentAngle += sweep;
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}
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}
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}
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//----------------------------------------------------------------------------------
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// Draw
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//----------------------------------------------------------------------------------
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BeginDrawing();
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ClearBackground(RAYWHITE);
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// Draw the pie chart on the canvas
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float startAngle = 0.0f;
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for (int i = 0; i < sliceCount; i++)
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{
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float sweepAngle = (totalValue > 0)? (values[i]/totalValue)*360.0f : 0.0f;
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float midAngle = startAngle + sweepAngle/2.0f; // Middle angle for label positioning
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Color color = ColorFromHSV((float)i/sliceCount*360.0f, 0.75f, 0.9f);
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float currentRadius = radius;
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// Make the hovered slice pop out by adding 5 pixels to its radius
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if (i == hoveredSlice) currentRadius += 20.0f;
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// Draw the pie slice using raylib's DrawCircleSector function
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DrawCircleSector(center, currentRadius, startAngle, startAngle + sweepAngle, 120, color);
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// Draw the label for the current slice
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if (values[i] > 0)
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{
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char labelText[64] = { 0 };
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if (showValues && showPercentages) snprintf(labelText, 64, "%.1f (%.0f%%)", values[i], (values[i]/totalValue)*100.0f);
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else if (showValues) snprintf(labelText, 64, "%.1f", values[i]);
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else if (showPercentages) snprintf(labelText, 64, "%.0f%%", (values[i]/totalValue)*100.0f);
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else labelText[0] = '\0';
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Vector2 textSize = MeasureTextEx(GetFontDefault(), labelText, 20, 1);
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float labelRadius = radius*0.7f;
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Vector2 labelPos = { center.x + cosf(midAngle*DEG2RAD)*labelRadius - textSize.x/2.0f,
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center.y + sinf(midAngle*DEG2RAD)*labelRadius - textSize.y/2.0f };
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DrawText(labelText, (int)labelPos.x, (int)labelPos.y, 20, WHITE);
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}
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// Draw inner circle to create donut effect
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// TODO: This is a hacky solution, better use DrawRing()
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if (showDonut) DrawCircle(center.x, center.y, donutInnerRadius, RAYWHITE);
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startAngle += sweepAngle;
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}
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// UI control panel
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DrawRectangleRec(panelRect, Fade(LIGHTGRAY, 0.5f));
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DrawRectangleLinesEx(panelRect, 1.0f, GRAY);
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GuiSpinner((Rectangle){ panelPos.x + 95, (float)panelPos.y + 12, 125, 25 }, "Slices ", &sliceCount, 1, MAX_PIE_SLICES, false);
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GuiCheckBox((Rectangle){ panelPos.x + 20, (float)panelPos.y + 12 + 40, 20, 20 }, "Show Values", &showValues);
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GuiCheckBox((Rectangle){ panelPos.x + 20, (float)panelPos.y + 12 + 70, 20, 20 }, "Show Percentages", &showPercentages);
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GuiCheckBox((Rectangle){ panelPos.x + 20, (float)panelPos.y + 12 + 100, 20, 20 }, "Make Donut", &showDonut);
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if (showDonut) GuiDisable();
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GuiSliderBar((Rectangle){ panelPos.x + 80, (float)panelPos.y + 12 + 130, panelRect.width - 100, 30 },
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"Inner Radius", NULL, &donutInnerRadius, 5.0f, radius - 10.0f);
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GuiEnable();
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GuiLine((Rectangle){ panelPos.x + 10, (float)panelPos.y + 12 + 170, panelRect.width - 20, 1 }, NULL);
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// Scrollable area for slice editors
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scrollPanelBounds = (Rectangle){
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panelPos.x + panelMargin,
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(float)panelPos.y + 12 + 190,
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panelRect.width - panelMargin*2,
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panelRect.y + panelRect.height - panelPos.y + 12 + 190 - panelMargin
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};
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int contentHeight = sliceCount*35;
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GuiScrollPanel(scrollPanelBounds, NULL,
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(Rectangle){ 0, 0, panelRect.width - 25, (float)contentHeight },
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&scrollContentOffset, &view);
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const float contentX = view.x + scrollContentOffset.x; // Left of content
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const float contentY = view.y + scrollContentOffset.y; // Top of content
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BeginScissorMode((int)view.x, (int)view.y, (int)view.width, (int)view.height);
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for (int i = 0; i < sliceCount; i++)
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{
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const int rowY = (int)(contentY + 5 + i*35);
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// Color indicator
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Color color = ColorFromHSV((float)i/sliceCount*360.0f, 0.75f, 0.9f);
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DrawRectangle((int)(contentX + 15), rowY + 5, 20, 20, color);
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// Label textbox
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if (GuiTextBox((Rectangle){ contentX + 45, (float)rowY, 75, 30 }, labels[i], 32, editingLabel[i])) editingLabel[i] = !editingLabel[i];
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GuiSliderBar((Rectangle){ contentX + 130, (float)rowY, 110, 30 }, NULL, NULL, &values[i], 0.0f, 1000.0f);
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}
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EndScissorMode();
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EndDrawing();
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//----------------------------------------------------------------------------------
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}
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// De-Initialization
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//--------------------------------------------------------------------------------------
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CloseWindow(); // Close window and OpenGL context
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//--------------------------------------------------------------------------------------
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return 0;
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}
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