Initial Commit

Java/Processing/processing-3.3.6/modes/java/examples/Topics/Motion/MovingOnCurves/MovingOnCurves.pde

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+/**
+ * Moving On Curves. 
+ * 
+ * In this example, the circles moves along the curve y = x^4.
+ * Click the mouse to have it move to a new position.
+ */
+
+float beginX = 20.0;  // Initial x-coordinate
+float beginY = 10.0;  // Initial y-coordinate
+float endX = 570.0;   // Final x-coordinate
+float endY = 320.0;   // Final y-coordinate
+float distX;          // X-axis distance to move
+float distY;          // Y-axis distance to move
+float exponent = 4;   // Determines the curve
+float x = 0.0;        // Current x-coordinate
+float y = 0.0;        // Current y-coordinate
+float step = 0.01;    // Size of each step along the path
+float pct = 0.0;      // Percentage traveled (0.0 to 1.0)
+
+void setup() {
+  size(640, 360);
+  noStroke();
+  distX = endX - beginX;
+  distY = endY - beginY;
+}
+
+void draw() {
+  fill(0, 2);
+  rect(0, 0, width, height);
+  pct += step;
+  if (pct < 1.0) {
+    x = beginX + (pct * distX);
+    y = beginY + (pow(pct, exponent) * distY);
+  }
+  fill(255);
+  ellipse(x, y, 20, 20);
+}
+
+void mousePressed() {
+  pct = 0.0;
+  beginX = x;
+  beginY = y;
+  endX = mouseX;
+  endY = mouseY;
+  distX = endX - beginX;
+  distY = endY - beginY;
+}