implement first bullet point of question 2

Just classes and constructors

lab4.pde

+class sRGB {
+  float r, g, b;
+  sRGB(color c) { }
+  sRGB(float _r, float _g, float _b) {
+    r = _r;
+    g = _g;
+    b = _b;
+  }
+  String toString() {
+    return "<sRGB r: " + r + " g: " + g + " b: " + b + ">";
+  }
+}
+
+class XYZ {
+  float x, y, z;
+  XYZ(float _x, float _y, float _z) {
+    x = _x;
+    y = _y;
+    z = _z;
+  }
+  String toString() {
+    return "<XYZ x: " + x + " y: " + y + " z: " + z + ">";
+  }
+}
+
+void setup () {
+  XYZ c;
+  c = new XYZ(1.0, 1.0, 1.0);
+  println(c);
+}