Initial Commit

Java/Processing/processing-3.3.6/modes/java/examples/Basics/Input/Constrain/Constrain.pde

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+/**
+ * Constrain. 
+ * 
+ * Move the mouse across the screen to move the circle. 
+ * The program constrains the circle to its box. 
+ */
+ 
+float mx;
+float my;
+float easing = 0.05;
+int radius = 24;
+int edge = 100;
+int inner = edge + radius;
+
+void setup() {
+  size(640, 360);
+  noStroke(); 
+  ellipseMode(RADIUS);
+  rectMode(CORNERS);
+}
+
+void draw() { 
+  background(51);
+  
+  if (abs(mouseX - mx) > 0.1) {
+    mx = mx + (mouseX - mx) * easing;
+  }
+  if (abs(mouseY - my) > 0.1) {
+    my = my + (mouseY- my) * easing;
+  }
+  
+  mx = constrain(mx, inner, width - inner);
+  my = constrain(my, inner, height - inner);
+  fill(76);
+  rect(edge, edge, width-edge, height-edge);
+  fill(255);  
+  ellipse(mx, my, radius, radius);
+}