openframeworks basic tutorial LeapMotion gesture recognition

The following repository version could be built without problems or you could also receive directly from openframeworks addon.

• https://github.com/jasonrwalters/ofxLeapMotion

First of all, as a Hello World-like sample, try to recognize and display the hand. Only the fingertip could be detected independently! Easy!

There are two ways available for ofxLeapMotion. The first method is to use a simple hand model called ofxLeapMotionSimpleHand defined in ofxLeapMotion. The second method is to access and display functions provided by LeapMotion's SDK.

First of all, I try to draw by using a simple ofxLeapMotionSimpleHand. The way of doing it is very simple, once you have recognized ofxLeapMotionSimpleHand, calling a method called debugDraw () on that instance will display a simple 3D model of the hand.

testApp.cpp

#include "testApp.h"

void testApp::setup(){
ofSetFrameRate(60);
ofSetVerticalSync(true);
ofBackground(31);

ofEnableLighting();
light.setPosition(200, 300, 50);
light.enable();
cam.setOrientation(ofPoint(-20, 0, 0));

glEnable(GL_DEPTH_TEST);
glEnable(GL_NORMALIZE);
leap.open();
}

void testApp::update(){

simpleHands = leap.getSimpleHands();

if( leap.isFrameNew() && simpleHands.size() ){
fingerPos.clear();

leap.setMappingX(-230, 230, -ofGetWidth()/2, ofGetWidth()/2);
leap.setMappingY(90, 490, -ofGetHeight()/2, ofGetHeight()/2);
leap.setMappingZ(-150, 150, -200, 200);

for(int i = 0; i < simpleHands.size(); i++){
for(int j = 0; j < simpleHands[i].fingers.size(); j++){
ofVec3f pos = simpleHands[i].fingers[j].pos;
fingerPos.push_back(pos);
}

}
}
leap.markFrameAsOld();
}

void testApp::draw(){
cam.begin();
for(int i = 0; i < fingerPos.size(); i++){
ofBoxPrimitive box;
box.setPosition(fingerPos[i].x, fingerPos[i].y, fingerPos[i].z);
box.set(20);
box.draw();
}
cam.end();
}

testApp.h

#include "ofMain.h"
#include "ofxLeapMotion.h"

class testApp : public ofBaseApp{

public:
void setup();
void update();
void draw();

void keyPressed (int key);
void keyReleased(int key);
void mouseMoved(int x, int y );
void mouseDragged(int x, int y, int button);
void mousePressed(int x, int y, int button);
void mouseReleased(int x, int y, int button);
void windowResized(int w, int h);
void dragEvent(ofDragInfo dragInfo);
void gotMessage(ofMessage msg);
void exit();

ofxLeapMotion leap;
vector simpleHands;
ofEasyCam cam;
ofLight light;
vector fingerPos;
};

The output :