Create ScreenTransitionCircle.c

effects/ScreenTransitionCircle.c

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+//
+// Circle screen transition effect using Bresenham circle.
+//
+//
+
+#include "raylib.h"
+
+//
+// Our function for transitioning the screen.
+void circletransition(int radius, int screenWidth, int screenHeight, Color col);
+// Helper functions for curcletransition....
+void circleBres(int xc, int yc, int r,int screenWidth, int screenHeight, Color col);
+void putpixelBres(int xc, int yc, int x, int y,int screenWidth, int screenHeight,  Color col);
+
+
+int main(void)
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    int screenWidth = 800;
+    int screenHeight = 450;
+
+    InitWindow(screenWidth, screenHeight, "raylib example.");
+ 
+    SetTargetFPS(60);               // Set our game to run at 60 frames-per-second
+    //--------------------------------------------------------------------------------------
+
+    // transition setup(start with nothing to grow)
+    int radius=0;
+    int state=0;
+
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        
+        //
+        // Here our transition effects is done.
+        //
+        // Draw our transition
+        circletransition(radius,screenWidth,screenHeight,BLACK);
+        // Grow our circle
+        if(state==0 && radius<screenWidth/1.5){
+            radius+=6;
+        }else{
+            state=1;
+        }
+        // Shrink our circle
+        if(state==1 && radius>0){
+            radius-=6;
+        }else{
+            state=0;
+        }
+
+        //----------------------------------------------------------------------------------
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(RAYWHITE);
+
+            for(int y=0;y<screenHeight;y+=30){
+            for(int x=0;x<screenWidth;x+=250){
+                DrawText("Hello this is a fade..",x,y,25,BLACK);
+            }}
+            
+            
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+
+
+}
+
+void circletransition(int radius, int screenWidth, int screenHeight,Color col){
+    int cx = screenWidth/2;
+    int cy = screenHeight/2;
+    for(int a=0;a<cy-radius;a++){
+        DrawLine(0,a,screenWidth,a,col);
+    }        
+    circleBres(cx,cy, radius,screenWidth,screenHeight,BLACK);
+    for(int a=cy+radius;a<screenHeight;a++){
+        DrawLine(0,a,screenWidth,a,col);
+    }
+
+}
+
+void circleBres(int xc, int yc, int r, int screenWidth, int screenHeight,  Color col) 
+{ 
+    int x=0;
+    int y=r;
+    int p=1-r;
+    while(x<=y){
+        putpixelBres(xc,yc,x,y,screenWidth, screenHeight, col);
+        if(p<=0){
+            x=x+1;
+            y=y;
+            p=p+(x*2)+3;
+        }else if(p>0)
+        {
+            x=x+1;
+            y=y-1;
+            p=p+(x*2)-(y*2)+5;
+        }
+    }
+}   
+//
+// Here we draw from the circle outwards to the edges of the screen,.
+void putpixelBres(int xc, int yc, int x, int y, int screenWidth, int screenHeight, Color col) {     
+    DrawLine(screenWidth,yc+y,xc+x, yc+y, col);
+    DrawLine(0,yc+y,xc-x, yc+y, col); 
+    DrawLine(screenWidth,yc-y,xc+x, yc-y, col); 
+    DrawLine(0,yc-y,xc-x, yc-y, col); 
+    DrawLine(0,yc-x,xc-y, yc-x, col); 
+    DrawLine(screenWidth,yc-x,xc+y, yc-x, col); 
+    DrawLine(0,yc+x,xc-y, yc+x, col); 
+    DrawLine(screenWidth,yc+x,xc+y, yc+x, col); 
+    
+} 
+