[examples] Add shapes_triangle_strip

examples/shapes/shapes_triangle_strip.c

@@ -0,0 +1,115 @@
+/*******************************************************************************************
+*
+*   raylib [shapes] example - triangle strip
+*
+*   Example complexity rating: [★★☆☆] 2/4
+*
+*   Example originally created with raylib 5.6-dev, last time updated with raylib 5.6-dev
+*
+*   Example contributed by Jopestpe (@jopestpe)
+*
+*   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
+*   BSD-like license that allows static linking with closed source software
+*
+*   Copyright (c) 2018-2025 Jopestpe (@jopestpe)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+#include <math.h>
+
+#define RAYGUI_IMPLEMENTATION
+#include "raygui.h"                 // Required for GUI controls
+
+//----------------------------------------------------------------------------------
+// Module Functions Declaration
+//----------------------------------------------------------------------------------
+static Vector2 CalculatePoint(Vector2 start, float angle, float length);
+static void DrawTriangleCustom(Vector2 point1, Vector2 point2, Vector2 point3, float angle, bool outline);
+
+//------------------------------------------------------------------------------------
+// Program main entry point
+//------------------------------------------------------------------------------------
+int main(void)
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const int screenWidth = 800;
+    const int screenHeight = 450;
+
+    InitWindow(screenWidth, screenHeight, "raylib [shapes] example - triangle strip");
+
+    Vector2 points[120] = { 0 };
+    Vector2 center = { (screenWidth/2.0f) - 125.f, screenHeight/2.0f };
+    float segments = 6.0f;
+    float insideRadius = 100.0f;
+    float outsideRadius = 150.0f;
+    bool outline = true;
+    
+    SetTargetFPS(60);               // Set our game to run at 60 frames-per-second
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+
+        int pointCount = (int)(segments);
+        float angleStep = (360.0f/pointCount)*DEG2RAD;
+
+        for (int i = 0, i2 = 0; i < pointCount; i++, i2 += 2)
+        {
+            points[i2] = CalculatePoint(center, i*angleStep, insideRadius);
+            points[i2 + 1] = CalculatePoint(center, i*angleStep + angleStep/2.0f, outsideRadius);
+        }
+        
+        points[pointCount*2] = points[0];
+        points[pointCount*2 + 1] = points[1];
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(RAYWHITE);
+
+            for (int i = 0, i2 = 0; i < pointCount; i++, i2 += 2)
+            {
+                DrawTriangleCustom(points[i2], points[i2 + 1], points[i2 + 2], i*angleStep, outline);
+                DrawTriangleCustom(points[i2 + 2], points[i2 + 1], points[i2 + 3], i*angleStep + (angleStep/2), outline);
+            }
+ 
+            DrawLine(580, 0, 580, GetScreenHeight(), (Color){ 218, 218, 218, 255 });
+            DrawRectangle(580, 0, GetScreenWidth(), GetScreenHeight(), (Color){ 232, 232, 232, 255 });
+
+            // Draw GUI controls
+            //------------------------------------------------------------------------------
+            GuiSliderBar((Rectangle){ 640, 40, 120, 20}, "Segments", TextFormat("%.0f", segments), &segments, 6.0f, 60.f);
+            GuiCheckBox((Rectangle){ 640, 70, 20, 20 }, "Outline", &outline);
+            //------------------------------------------------------------------------------
+
+            DrawFPS(10, 10);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}
+
+static Vector2 CalculatePoint(Vector2 start, float angle, float radius)
+{
+    return (Vector2){ start.x + cosf(angle)*radius, start.y + sinf(angle)*radius };
+} 
+
+static void DrawTriangleCustom(Vector2 point1, Vector2 point2, Vector2 point3, float angle, bool outline) 
+{
+    Color color = ColorFromHSV(angle*RAD2DEG, 1.0f, 1.0f);
+    DrawTriangle(point3, point2, point1, color);
+    if (outline) DrawTriangleLines(point1, point2, point3, BLACK);
+}