Drew board and colours, set it up

harmonograph/board.pde

+class Board {
+  // probably bad form to name somethign "colour" if there already is a "color"
+  Colour[][] bPixels;
+  int bWidth, bHeight;
+  
+  Board(int w, int h, Colour bg) {
+    bWidth = w; bHeight = h;
+    bPixels = new Colour[w][h];
+    for (int y = 0; y < bHeight; y++) {
+      for (int x = 0; x < bWidth; x++) {
+        if (x == 50 && y == 50) {
+          println("created 50 50");
+          println(bPixels[x][y]);
+        }
+        bPixels[x][y] = new Colour(bg);
+        if (x == 50 && y == 50) {
+          println(bPixels[x][y]);
+        }
+      }
+    }
+  }
+  
+  Colour getPixel(int x, int y) {
+    return bPixels[x][y];
+  }
+  
+  void Draw() {
+    for (int y = 0; y < bHeight; y++) {
+      for (int x = 0; x < bWidth; x++) {
+        set(x, y, bPixels[x][y].getColor());
+      }
+    }
+  }
+}
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harmonograph/color.pde

+class Colour {
+  float r, g, b, a;
+  Colour(float rS, float gS, float bS, float aS) {
+    r = rS; g = gS; b = bS; a = aS;
+  }
+  Colour() {
+    r = 0; g = 0; b = 0; a = 0;
+  }
+  Colour(Colour c) {
+    r = c.r; g = c.g; b = c.b; a = c.a;
+  }
+  void darken(float rS, float gS, float bS, float aS) {
+    r += rS; g += gS; b += bS; a += aS;
+  }
+  void lighten(float rS, float gS, float bS, float aS) {
+    r -= rS; g -= gS; b -= bS; a -= aS;
+  }
+  void darken(Colour c) {
+    r += c.r; g += c.g; b += c.b; a += c.a;
+  }
+  Colour multiply(float p) {
+    return new Colour(r * p, g * p, b * p, a);
+  }
+  color getColor() {
+    return color(round(r * 255), round(g * 255), round(b * 255), round(a * 255));
+  }
+}
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harmonograph/harmonograph.pde

+float penX, penY;
+
+Board board;
+Colour penColour;
+
+void setup() {
+  size(800, 500);
+  board = new Board(width, height, new Colour(0, 0, 0, 1));
+  penColour = new Colour(0, 0, 1, 1);
+  noSmooth();
+  penX = 50;
+  penY = 50;
+}
+
+void mouseMoved() {
+  penX = mouseX;
+  penY = mouseY;
+  drawCurrentPixel();
+}
+
+void draw () {
+  board.Draw();
+}
+
+void drawCurrentPixel() {
+  board.getPixel(round(penX), round(penY)).darken(penColour.multiply(0.5));
+}
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