Create Beginners_-_GetImageData.c

Beginners_-_GetImageData.c

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+
+#include "raylib.h"
+#include <stdlib.h>           // Required for: free()
+
+//
+// How to draw into a image and then read the image data and use that. 
+//
+
+int main(void)
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const int screenWidth = 800;
+    const int screenHeight = 450;
+
+    InitWindow(screenWidth, screenHeight, "raylib example.");
+
+    // Create a Perlin Image
+    Image tempImage = GenImageColor(32,32,BLACK); 
+    ImageDrawCircle(&tempImage,16,16,10,RED);
+    Color *mapPixels = GetImageData(tempImage);
+
+    // We will put the image data from the rectangle in this map.
+    int map[32][32] = {0};
+    
+    for (int y = 0; y < tempImage.height; y++)
+    {
+        for (int x = 0; x < tempImage.width; x++)
+        {
+            if ((mapPixels[y*tempImage.width + x].r != 0)){       // Collision: if other than 0.
+            map[x][y] = 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
+        //----------------------------------------------------------------------------------
+        
+        //----------------------------------------------------------------------------------
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(RAYWHITE);
+                
+            for(int y=0;y<32;y++){
+                for(int x=0;x<32;x++){
+                    if(map[x][y]==1)DrawRectangle(x*16,y*8,16,8,RED);
+                }
+            }
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    free(mapPixels);            // Unload color array
+    UnloadImage(tempImage);             // Unload image from RAM
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+
+
+}