The document defines a testApp class that inherits from ofBaseApp for use in an openFrameworks application. The class contains functions for setup, update, draw and handling user input. It initializes an ofVideoGrabber and uses ofxOpenCv for computer vision functions including color and grayscale images. It also detects contours and tracks threshold values for blob detection.

6. #ifndef _TEST_APP
#define _TEST_APP
#include "ofMain.h"
#include "ofxOpenCv.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);
ofVideoGrabber vidGrabber;
ofxCvColorImage colorImg;
};
#endif

7. #include "testApp.h"
void testApp::setup(){
ofBackground(0,0,0);
vidGrabber.setVerbose(true);
vidGrabber.initGrabber(320,240);
colorImg.allocate(320,240);
}
void testApp::update(){
bool bNewFrame = false;
vidGrabber.grabFrame();
bNewFrame = vidGrabber.isFrameNew();
! if (bNewFrame){
colorImg.setFromPixels(vidGrabber.getPixels(), 320,240);
! }
}
void testApp::draw(){
colorImg.draw(20,20);
}
...( )...

10. #ifndef _TEST_APP
#define _TEST_APP
#include "ofMain.h"
#include "ofxOpenCv.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);
ofVideoGrabber vidGrabber;
ofxCvColorImage colorImg;
ofxCvGrayscaleImage grayImage;
};
#endif

11. #include "testApp.h"
void testApp::setup(){
ofBackground(0, 0, 0);
vidGrabber.setVerbose(true);
vidGrabber.initGrabber(320,240);
colorImg.allocate(320,240);
grayImage.allocate(320,240);
}
void testApp::update(){
bool bNewFrame = false;
vidGrabber.grabFrame();
bNewFrame = vidGrabber.isFrameNew();
! if (bNewFrame){
colorImg.setFromPixels(vidGrabber.getPixels(), 320,240);
grayImage = colorImg;
! }
}
void testApp::draw(){
ofSetColor(0xffffff);
colorImg.draw(20,20);
grayImage.draw(360,20);
}
...( )...

14. #ifndef _TEST_APP
#define _TEST_APP
#include "ofMain.h"
#include "ofxOpenCv.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);
ofVideoGrabber vidGrabber;
ofxCvColorImage colorImg;
ofxCvGrayscaleImage grayImage;
ofxCvGrayscaleImage grayBg;
ofxCvGrayscaleImage grayDiff;
bool bLearnBakground;
int threshold;
};
#endif

15. #include "testApp.h"
void testApp::setup(){
ofBackground(0, 0, 0);
ofEnableAlphaBlending();
vidGrabber.setVerbose(true);
vidGrabber.initGrabber(320,240);
colorImg.allocate(320,240);
grayImage.allocate(320,240);
grayBg.allocate(320,240);
! grayDiff.allocate(320,240);
bLearnBakground = true;
threshold = 100;
}
void testApp::update(){
bool bNewFrame = false;
vidGrabber.grabFrame();
bNewFrame = vidGrabber.isFrameNew();
! if (bNewFrame){
colorImg.setFromPixels(vidGrabber.getPixels(), 320,240);
grayImage = colorImg;
if (bLearnBakground == true){

16. ! ! ! grayBg = grayImage;
! ! ! bLearnBakground = false;
! ! }
grayDiff.absDiff(grayBg, grayImage);
grayDiff.threshold(threshold);
! }
}
void testApp::draw(){
ofNoFill();
ofSetColor(0xffffff);
colorImg.draw(20,20);
grayImage.draw(360,20);
grayBg.draw(20,280);
! grayDiff.draw(360,280);
ofSetColor(0xffffff);
! char reportStr[1024];
! sprintf(reportStr, "threshold %i (press: +/-)", threshold);
! ofDrawBitmapString(reportStr, 20, 600);
}

17. void testApp::keyPressed (int key){
! switch (key){
! ! case ' ':
! ! ! bLearnBakground = true;
! ! ! break;
case '+':
! ! ! threshold ++;
! ! ! if (threshold > 255) threshold = 255;
! ! ! break;
! ! case '-':
! ! ! threshold --;
! ! ! if (threshold < 0) threshold = 0;
! ! ! break;
! }
}
...( )...

20. #ifndef _TEST_APP
#define _TEST_APP
#include "ofMain.h"
#include "ofxOpenCv.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);
ofVideoGrabber vidGrabber;
ofxCvColorImage colorImg;
ofxCvGrayscaleImage grayImage;
ofxCvGrayscaleImage grayBg;
ofxCvGrayscaleImage grayDiff;
ofxCvContourFinder contourFinder;
bool bLearnBakground;
int threshold;
};
#endif

21. #include "testApp.h"
void testApp::setup(){
ofBackground(0, 0, 0);
ofEnableAlphaBlending();
vidGrabber.setVerbose(true);
vidGrabber.initGrabber(320,240);
colorImg.allocate(320,240);
grayImage.allocate(320,240);
grayBg.allocate(320,240);
! grayDiff.allocate(320,240);
bLearnBakground = true;
threshold = 100;
}
void testApp::update(){
bool bNewFrame = false;
vidGrabber.grabFrame();
bNewFrame = vidGrabber.isFrameNew();
! if (bNewFrame){
colorImg.setFromPixels(vidGrabber.getPixels(), 320,240);
grayImage = colorImg;
if (bLearnBakground == true){
! ! ! grayBg = grayImage;

22. ! ! ! bLearnBakground = false;
! ! }
grayDiff.absDiff(grayBg, grayImage);
grayDiff.threshold(threshold);
contourFinder.findContours(grayDiff, 20, (340*240)/3, 10, true);
! }
}
void testApp::draw(){
ofNoFill();
ofSetColor(0xffffff);
colorImg.draw(20,20);
grayImage.draw(360,20);
grayBg.draw(20,280);
! grayDiff.draw(360,280);
for (int i = 0; i < contourFinder.nBlobs; i++){
contourFinder.blobs[i].draw(360,540);
}
ofSetColor(0xffffff);
! char reportStr[1024];
! sprintf(reportStr, "threshold %i (press: +/-)nnum blobs found %i",
threshold, contourFinder.nBlobs);
! ofDrawBitmapString(reportStr, 20, 600);
}

23. void testApp::keyPressed (int key){
! switch (key){
! ! case ' ':
! ! ! bLearnBakground = true;
! ! ! break;
! ! case '+':
! ! ! threshold ++;
! ! ! if (threshold > 255) threshold = 255;
! ! ! break;
! ! case '-':
! ! ! threshold --;
! ! ! if (threshold < 0) threshold = 0;
! ! ! break;
! }
}
...( )...

26. #ifndef _TEST_APP
#define _TEST_APP
#include "ofMain.h"
#include "ofxOpenCv.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);
ofVideoGrabber vidGrabber;
ofxCvColorImage colorImg;
ofxCvGrayscaleImage grayImage;
ofxCvGrayscaleImage grayBg;
ofxCvGrayscaleImage grayDiff;
ofxCvContourFinder contourFinder;
bool bLearnBakground;
int threshold;
};
#endif

27. #include "testApp.h"
void testApp::setup(){
ofBackground(0, 0, 0);
ofEnableAlphaBlending();
vidGrabber.setVerbose(true);
vidGrabber.initGrabber(320,240);
colorImg.allocate(320,240);
grayImage.allocate(320,240);
grayBg.allocate(320,240);
grayDiff.allocate(320,240);
bLearnBakground = true;
threshold = 100;
}
void testApp::update(){
bool bNewFrame = false;
vidGrabber.grabFrame();
bNewFrame = vidGrabber.isFrameNew();
! if (bNewFrame){
colorImg.setFromPixels(vidGrabber.getPixels(), 320,240);
grayImage = colorImg;
if (bLearnBakground == true){
! ! ! grayBg = grayImage;
! ! ! bLearnBakground = false;
! ! }

28. grayDiff.absDiff(grayBg, grayImage);
grayDiff.threshold(threshold);
contourFinder.findContours(grayDiff, 20, (340*240)/3, 10, true);
! }
}
void testApp::draw(){
ofFill();
ofSetColor(0, 31, 255, 200);
for( int i=0; i<(int)contourFinder.blobs.size(); i++ ) {
! ! ofBeginShape();
! ! for( int j=0; j<contourFinder.blobs[i].nPts; j++ ) {
! ! ! ofVertex( contourFinder.blobs[i].pts[j].x * 4,
contourFinder.blobs[i].pts[j].y * 4 );
! ! }
! ! ofEndShape();
! }
ofSetColor(0xffffff);
! char reportStr[1024];
! sprintf(reportStr, "threshold %i (press: +/-)nnum blobs found %i",
threshold, contourFinder.nBlobs);
! ofDrawBitmapString(reportStr, 20, 10);
}

29. void testApp::keyPressed (int key){
! switch (key){
! ! case ' ':
! ! ! bLearnBakground = true;
! ! ! break;
case '+':
! ! ! threshold ++;
! ! ! if (threshold > 255) threshold = 255;
! ! ! break;
! ! case '-':
! ! ! threshold --;
! ! ! if (threshold < 0) threshold = 0;
! ! ! break;
! }
}
...( )...

32. #ifndef _TEST_APP
#define _TEST_APP
#include "ofMain.h"
#include "ofxOpenCv.h"
#include "ofxBox2d.h"
#include "ofxVectorMath.h"
#include "CustomCircle.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);
ofVideoGrabber vidGrabber;
ofxCvColorImage colorImg;
ofxCvGrayscaleImage grayImage;
ofxCvGrayscaleImage grayBg;

33. ofxCvGrayscaleImage grayDiff;
ofxCvContourFinder contourFinder;
bool bLearnBakground;
int threshold;
ofxBox2d box2d;
vector <ofxBox2dLine> lineStrips;
vector <ofxBox2dPolygon> polygons;
vector <CustomCircle> circles;
};
#endif

34. #include "testApp.h"
void testApp::setup(){
ofBackground(0, 0, 0);
ofEnableAlphaBlending();
ofSetFrameRate(30);
vidGrabber.setVerbose(true);
vidGrabber.initGrabber(320,240);
colorImg.allocate(320,240);
grayImage.allocate(320,240);
grayBg.allocate(320,240);
! grayDiff.allocate(320,240);
bLearnBakground = true;
threshold = 20;
box2d.init();
! box2d.setGravity(0, 10);
box2d.createBounds();
! box2d.setFPS(30.0);
}
void testApp::update(){
bool bNewFrame = false;
vidGrabber.grabFrame();
bNewFrame = vidGrabber.isFrameNew();

35. ! if (bNewFrame){
colorImg.setFromPixels(vidGrabber.getPixels(),320,240);
grayImage = colorImg;
if (bLearnBakground == true){
! ! ! grayBg = grayImage;
! ! ! bLearnBakground = false;
! ! }
grayDiff.absDiff(grayBg, grayImage);
grayDiff.threshold(threshold);
contourFinder.findContours(grayDiff, 40, (ofGetWidth()*ofGetHeight())/
3, 5, false);
for (int i=0; i<lineStrips.size(); i++) {
lineStrips[i].clear();
}
for( int i=0; i<(int)contourFinder.blobs.size(); i++ ) {
ofxBox2dLine l;
l.setPhysics(1.0, 0.8, 0.5);
l.setWorld(box2d.getWorld());
for( int j=0; j<contourFinder.blobs[i].nPts; j++ ) {
l.addPoint(contourFinder.blobs[i].pts[j].x*ofGetWidth()/320,
contourFinder.blobs[i].pts[j].y*ofGetHeight()/240);
}
l.createShape();
lineStrips.push_back(l);
}
! }
box2d.update();
}

36. void testApp::draw(){
for (int i=0; i<lineStrips.size(); i++) {
lineStrips[i].draw();
}
//circles
for(int i=0; i<circles.size(); i++) {
circles[i].draw();
}
ofSetColor(255, 255, 255);
! char reportStr[1024];
! sprintf(reportStr, "threshold %i (press: +/-)nnum blobs found %i",
threshold, contourFinder.nBlobs);
! ofDrawBitmapString(reportStr, 20, 10);
}
void testApp::keyPressed (int key){
! switch (key){
! ! case ' ':
! ! ! bLearnBakground = true;
! ! ! break;
case '+':
! ! ! threshold ++;
! ! ! if (threshold > 255) threshold = 255;
! ! ! break;

37. ! ! case '-':
! ! ! threshold --;
! ! ! if (threshold < 0) threshold = 0;
! ! ! break;
case 'f':
ofSetFullscreen(true);
break;
case 'c':
float r = ofRandom(20, 40); //
CustomCircle c; //CustomCircle
c.setPhysics(1.0, 0.8, 0.5); //
c.setup(box2d.getWorld(), mouseX, mouseY, r); //
circles.push_back(c); // circles
break;
! }
}
void testApp::keyReleased(int key){
}
void testApp::mouseMoved(int x, int y){
}
void testApp::mouseDragged(int x, int y, int button){
}

38. void testApp::mousePressed(int x, int y, int button){
}
void testApp::mouseReleased(int x, int y, int button){
}
void testApp::windowResized(int w, int h){
}

39. #include "ofxVectorMath.h"
#include "ofxBox2d.h"
//ofxBox2dCircle CustomCircle
class CustomCircle : public ofxBox2dCircle {
public:
void draw(); //
};

40. #include "CustomCircle.h"
void CustomCircle::draw()
{
float radius = getRadius(); //
glPushMatrix(); //
glTranslatef(getPosition().x, getPosition().y, 0); //
ofFill(); //
ofSetColor(31,127,255,100); // 1
ofCircle(0, 0, radius);!// 1
ofSetColor(31,127,255,200); // 2
ofCircle(0, 0, radius*0.7); // 2
glPopMatrix(); //
}