Create gridrotate.c

SpriteEditor/gridrotate.c

@@ -0,0 +1,100 @@
+//
+// Loses pixels in the progress. Trying to learn/do the reverse rotation.
+//
+
+
+#include "raylib.h"
+#include <stdlib.h>           // Required for: free()
+
+//
+// How to draw into a image and then read the image data and use that. 
+//
+float angle=0;
+float reverseangle=0;
+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); 
+    ImageDrawRectangleV(&tempImage,(Vector2){16-5,16-5},(Vector2){10,10},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
+        //----------------------------------------------------------------------------------
+        if(IsKeyDown(KEY_RIGHT)){
+            angle+=0.1;
+            reverseangle=angle+3.142;
+        }
+        if(IsKeyDown(KEY_LEFT)){
+            angle-=0.1;
+            reverseangle=angle+3.142;
+        }
+
+        //----------------------------------------------------------------------------------
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+            //angle+=.1;
+            ClearBackground(RAYWHITE);
+
+            int temp[32][32]={0};    
+            for(int y=0;y<32;y++){
+                for(int x=0;x<32;x++){
+                    float x2=(cos(angle)*(x-16) - sin(angle)*(y-16));
+                    float y2=(sin(angle)*(x-16) + cos(angle)*(y-16));
+                    //if(map[x+16][y+16]==1)DrawRectangle(x2*16+320,y2*8+240,16,8,RED);
+                    x2+=16;
+                    y2+=16;
+                    if(x2>-1 && y2>-1 && x2<32 && y2<32){
+                    temp[(int)x2][(int)y2]=map[x][y];
+                    }
+                }
+            }
+            for(int y=0;y<32;y++){
+                for(int x=0;x<32;x++){
+                    if(temp[x][y]!=0){
+                        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;
+
+
+}