This example is for Processing 3+. If you have a previous version, use the examples included with your software. If you see any errors or have suggestions, please let us know.
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; }