Initial Commit

Java/Processing/processing-3.3.6/modes/java/examples/Basics/Math/Map/Map.pde

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+/**
+ * Map.
+ * 
+ * Use the map() function to take any number and scale it to a new number 
+ * that is more useful for the project that you are working on. For example, use the
+ * numbers from the mouse position to control the size or color of a shape. 
+ * In this example, the mouse’s x-coordinate (numbers between 0 and 360) are scaled to
+ * new numbers to define the color and size of a circle.
+ */
+
+void setup() {
+  size(640, 360);
+  noStroke();
+}
+
+void draw() {
+  background(0);
+  // Scale the mouseX value from 0 to 640 to a range between 0 and 175
+  float c = map(mouseX, 0, width, 0, 175);
+  // Scale the mouseX value from 0 to 640 to a range between 40 and 300
+  float d = map(mouseX, 0, width, 40, 300);
+  fill(255, c, 0);
+  ellipse(width/2, height/2, d, d);   
+}