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+/**
+ * A Processing implementation of Game of Life
+ * By Joan Soler-Adillon
+ *
+ * Press SPACE BAR to pause and change the cell's values with the mouse
+ * On pause, click to activate/deactivate cells
+ * Press R to randomly reset the cells' grid
+ * Press C to clear the cells' grid
+ *
+ * The original Game of Life was created by John Conway in 1970.
+ */
+
+// Size of cells
+int cellSize = 5;
+
+// How likely for a cell to be alive at start (in percentage)
+float probabilityOfAliveAtStart = 15;
+
+// Variables for timer
+int interval = 100;
+int lastRecordedTime = 0;
+
+// Colors for active/inactive cells
+color alive = color(0, 200, 0);
+color dead = color(0);
+
+// Array of cells
+int[][] cells; 
+// Buffer to record the state of the cells and use this while changing the others in the interations
+int[][] cellsBuffer; 
+
+// Pause
+boolean pause = false;
+
+void setup() {
+  size (640, 360);
+
+  // Instantiate arrays 
+  cells = new int[width/cellSize][height/cellSize];
+  cellsBuffer = new int[width/cellSize][height/cellSize];
+
+  // This stroke will draw the background grid
+  stroke(48);
+
+  noSmooth();
+
+  // Initialization of cells
+  for (int x=0; x<width/cellSize; x++) {
+    for (int y=0; y<height/cellSize; y++) {
+      float state = random (100);
+      if (state > probabilityOfAliveAtStart) { 
+        state = 0;
+      }
+      else {
+        state = 1;
+      }
+      cells[x][y] = int(state); // Save state of each cell
+    }
+  }
+  background(0); // Fill in black in case cells don't cover all the windows
+}
+
+
+void draw() {
+
+  //Draw grid
+  for (int x=0; x<width/cellSize; x++) {
+    for (int y=0; y<height/cellSize; y++) {
+      if (cells[x][y]==1) {
+        fill(alive); // If alive
+      }
+      else {
+        fill(dead); // If dead
+      }
+      rect (x*cellSize, y*cellSize, cellSize, cellSize);
+    }
+  }
+  // Iterate if timer ticks
+  if (millis()-lastRecordedTime>interval) {
+    if (!pause) {
+      iteration();
+      lastRecordedTime = millis();
+    }
+  }
+
+  // Create  new cells manually on pause
+  if (pause && mousePressed) {
+    // Map and avoid out of bound errors
+    int xCellOver = int(map(mouseX, 0, width, 0, width/cellSize));
+    xCellOver = constrain(xCellOver, 0, width/cellSize-1);
+    int yCellOver = int(map(mouseY, 0, height, 0, height/cellSize));
+    yCellOver = constrain(yCellOver, 0, height/cellSize-1);
+
+    // Check against cells in buffer
+    if (cellsBuffer[xCellOver][yCellOver]==1) { // Cell is alive
+      cells[xCellOver][yCellOver]=0; // Kill
+      fill(dead); // Fill with kill color
+    }
+    else { // Cell is dead
+      cells[xCellOver][yCellOver]=1; // Make alive
+      fill(alive); // Fill alive color
+    }
+  } 
+  else if (pause && !mousePressed) { // And then save to buffer once mouse goes up
+    // Save cells to buffer (so we opeate with one array keeping the other intact)
+    for (int x=0; x<width/cellSize; x++) {
+      for (int y=0; y<height/cellSize; y++) {
+        cellsBuffer[x][y] = cells[x][y];
+      }
+    }
+  }
+}
+
+
+
+void iteration() { // When the clock ticks
+  // Save cells to buffer (so we opeate with one array keeping the other intact)
+  for (int x=0; x<width/cellSize; x++) {
+    for (int y=0; y<height/cellSize; y++) {
+      cellsBuffer[x][y] = cells[x][y];
+    }
+  }
+
+  // Visit each cell:
+  for (int x=0; x<width/cellSize; x++) {
+    for (int y=0; y<height/cellSize; y++) {
+      // And visit all the neighbours of each cell
+      int neighbours = 0; // We'll count the neighbours
+      for (int xx=x-1; xx<=x+1;xx++) {
+        for (int yy=y-1; yy<=y+1;yy++) {  
+          if (((xx>=0)&&(xx<width/cellSize))&&((yy>=0)&&(yy<height/cellSize))) { // Make sure you are not out of bounds
+            if (!((xx==x)&&(yy==y))) { // Make sure to to check against self
+              if (cellsBuffer[xx][yy]==1){
+                neighbours ++; // Check alive neighbours and count them
+              }
+            } // End of if
+          } // End of if
+        } // End of yy loop
+      } //End of xx loop
+      // We've checked the neigbours: apply rules!
+      if (cellsBuffer[x][y]==1) { // The cell is alive: kill it if necessary
+        if (neighbours < 2 || neighbours > 3) {
+          cells[x][y] = 0; // Die unless it has 2 or 3 neighbours
+        }
+      } 
+      else { // The cell is dead: make it live if necessary      
+        if (neighbours == 3 ) {
+          cells[x][y] = 1; // Only if it has 3 neighbours
+        }
+      } // End of if
+    } // End of y loop
+  } // End of x loop
+} // End of function
+
+void keyPressed() {
+  if (key=='r' || key == 'R') {
+    // Restart: reinitialization of cells
+    for (int x=0; x<width/cellSize; x++) {
+      for (int y=0; y<height/cellSize; y++) {
+        float state = random (100);
+        if (state > probabilityOfAliveAtStart) {
+          state = 0;
+        }
+        else {
+          state = 1;
+        }
+        cells[x][y] = int(state); // Save state of each cell
+      }
+    }
+  }
+  if (key==' ') { // On/off of pause
+    pause = !pause;
+  }
+  if (key=='c' || key == 'C') { // Clear all
+    for (int x=0; x<width/cellSize; x++) {
+      for (int y=0; y<height/cellSize; y++) {
+        cells[x][y] = 0; // Save all to zero
+      }
+    }
+  }
+}
+