nick /224 /camera_pan

PImage bufSlice;
PGraphics buf;
int destinationX;
int destinationY;
int positionX = 20;
int positionY = 20;
int positionX2 = 750;
int positionY2 = 750;
CameraPosition campos;

void setup() {
  size(400, 400, P3D);

  // Load our image.
  // Create an off-screen buffer that will contain the entire image.

  destinationX = width;
  destinationY = height;
  campos = new CameraPosition();
  buf = createGraphics(1000, 1000, P3D);
}

void draw() {
  background(255);
  buf.beginDraw();
  buf.ellipse(200, 200, 200, 200);
  buf.endDraw();
  destinationX = mouseX;
  destinationY = mouseY;
  campos.move(destinationX, destinationY);
}

/**
 * Updates the copied version of the off-screen buffer.
 */

class CameraPosition {
  float x, y; //position
  float currentX = 0;
  float currentY = 0;
  float easing;

  void move(float destX, float destY) {
    x = destX;
    y = destY;
    easing = .2;
    currentX += (y - currentX) * easing;
    currentY += (x - currentY) * easing;

    image(getBufSlice(currentX, currentY), 0, 0); // plot current position
  }
}

PImage getBufSlice(float currentX, float currentY) {
     int x = int(currentX);
     int y = int(currentY);
     return buf.get(x, y, width, height);
 }