Reviewed examples for consistency

examples/shapes/shapes_lines_splines.c

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+/*******************************************************************************************
+*
+*   raylib [shapes] example - splines drawing
+*
+*   Example originally created with raylib 4.6-dev, last time updated with raylib 4.6-dev
+*
+*   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) 2023 Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+
+#define MAX_CONTROL_POINTS      32
+
+typedef struct {
+    Vector2 start;
+    Vector2 end;
+} ControlPoint;
+
+//------------------------------------------------------------------------------------
+// Program main entry point
+//------------------------------------------------------------------------------------
+int main(void)
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const int screenWidth = 800;
+    const int screenHeight = 450;
+
+    SetConfigFlags(FLAG_MSAA_4X_HINT);
+    InitWindow(screenWidth, screenHeight, "raylib [shapes] example - splines drawing");
+
+    Vector2 points[MAX_CONTROL_POINTS] = {
+        { 100.0f, 200.0f },
+        { 300.0f, 400.0f },
+        { 500.0f, 300.0f },
+        { 700.0f, 100.0f },
+        { 200.0f, 100.0f },
+    };
+    
+    int pointCount = 5;
+    int selectedPoint = -1;
+    
+    int splineType = 0;             // 0-Linear, 1-BSpline, 2-CatmullRom, 3-Bezier
+    
+    // Cubic Bezier control points
+    ControlPoint control[MAX_CONTROL_POINTS] = { 0 };
+    for (int i = 0; i < pointCount - 1; i++)
+    {
+        control[i].start = points[i];
+        control[i].end = points[i + 1];
+    }
+    
+    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
+        //----------------------------------------------------------------------------------
+        // Points movement logic
+        if (IsMouseButtonPressed(MOUSE_RIGHT_BUTTON) && (pointCount < MAX_CONTROL_POINTS))
+        {
+            points[pointCount] = GetMousePosition();
+            pointCount++;
+        }
+
+        for (int i = 0; i < pointCount; i++)
+        {
+            if (IsMouseButtonDown(MOUSE_LEFT_BUTTON) && CheckCollisionPointCircle(GetMousePosition(), points[i], 6.0f))
+            {
+                selectedPoint = i;
+                break;
+            }
+        }
+
+        if (selectedPoint >= 0)
+        {
+            points[selectedPoint] = GetMousePosition();
+            if (IsMouseButtonReleased(MOUSE_LEFT_BUTTON)) selectedPoint = -1;
+        }
+        
+        // TODO: Cubic Bezier spline control points logic
+        
+        
+        // Spline selection logic
+        if (IsKeyPressed(KEY_ONE)) splineType = 0;
+        else if (IsKeyPressed(KEY_TWO)) splineType = 1;
+        else if (IsKeyPressed(KEY_THREE)) splineType = 2;
+        else if (IsKeyPressed(KEY_FOUR)) splineType = 3;
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(RAYWHITE);
+        
+            if (splineType == 0)        // Linear
+            {
+                // Draw linear spline
+                for (int i = 0; i < pointCount - 1; i++)
+                {
+                    DrawLineEx(points[i], points[i + 1], 2.0f, RED);
+                }
+            }
+            else if (splineType == 1)   // B-Spline
+            {
+                // Draw b-spline
+                DrawLineBSpline(points, pointCount, 2.0f, RED);
+                //for (int i = 0; i < (pointCount - 3); i++) DrawLineBSplineSegment(points[i], points[i + 1], points[i + 2], points[i + 3], 24.0f, BLUE);
+            }
+            else if (splineType == 2)   // CatmullRom Spline
+            {
+                // Draw spline: catmull-rom
+                DrawLineCatmullRom(points, pointCount, 2.0f, RED);
+                //for (int i = 0; i < (pointCount - 3); i++) DrawLineCatmullRomSegment(points[i], points[i + 1], points[i + 2], points[i + 3], 24.0f, Fade(BLUE, 0.4f));
+            }
+            else if (splineType == 3)   // Cubic Bezier
+            {
+                // Draw line bezier cubic (with control points)
+                for (int i = 0; i < pointCount - 1; i++)
+                {
+                    DrawLineBezierCubic(points[i], points[i + 1], control[i].start, control[i + 1].end, 2.0f, RED);
+
+                    // TODO: Every cubic bezier point should have two control points
+                    DrawCircleV(control[i].start, 4, GOLD);
+                    DrawCircleV(control[i].end, 4, GOLD);
+                    DrawLineEx(points[i], control[i].start, 1.0, LIGHTGRAY);
+                    DrawLineEx(points[i + 1], control[i].end, 1.0, LIGHTGRAY);
+                }
+            }
+
+            // Draw control points
+            for (int i = 0; i < pointCount; i++)
+            {
+                DrawCircleV(points[i], 6.0f, RED);
+                if ((splineType != 0) && (i < pointCount - 1)) DrawLineV(points[i], points[i + 1], GRAY);
+            }
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}