skell999/ofxImageSweep

Gpu based image effect

ofxImageSweep

Image sweep takes an image as input and slices it into a small strip with repeating symmetry.

Basic usage

Create ofImage and ofxImageSweep

ofImage image;
ofImage positionMap;
ofxImageSweep sweep;

Load an image and initialize ofxImageSweep

void ofApp::setup(){
  image.load("yourPic.jpg");
  positionMap.load("map.jpg"); // A black and white image that controls the position in the x direction
  sweep.allocate(ofGetWidth(),ofGetHeight());
}

In your update function

void ofApp::update(){
  float divX = 6; // Amount of x slices
  float divY = 6; // Amount of y slices
  float posX = 100; // Scan position x
  float posY = 100; // Scan position y
  bool flipX = true; // Enable x symmetry
  bool flipY = true; // Enable y symmetry
  bool sliceX = true; // Enable x slice
  bool sliceY = true; // Enable y slice
  sweep.update(image.getTexture(), positionMap.getTexture(), divX, divY, posX, posY, flipX, flipY, sliceX, sliceY);
}

Draw the image

void ofApp::draw(){
  sweep.draw(0, 0);
}

Animation

void ofApp::update(){
  float speed = 6;
  float position = ofGetElapsedTimef() * speed;

  float divX = 6; // Amount of x slices
  float divY = 6; // Amount of y slices

  float posX = position; // Scan position x
  float posY = position; // Scan position y

  bool flipX = true; // Enable x symmetry
  bool flipY = true; // Enable y symmetry

  bool sliceX = true; // Enable x slice
  bool sliceY = true; // Enable y slice

  sweep.update(image.getTexture(), positionMap.getTexture(), divX, divY, posX, posY, flipX, flipY, sliceX, sliceY);