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testApp.cpp
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testApp.cpp
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#include "testApp.h"
//--------------------------------------------------------------
void testApp::setup(){
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 = 80;
catchButtons = false;
numButtons = 0;
for (int i=0; i < NUM_BUTTONS; i++) {
reds[i] = (int) ofRandom(50, 255);
greens[i] = (int) ofRandom(50, 255);
blues[i] = (int) ofRandom(50, 255);
isButtonOn[i] = false;
}
//audio setup
int bufferSize = 512;
sampleRate = 44100;
phase = 0.0f; phase2 = 0.0f; phase3 = 0.0f; phase4 = 0.0f;
phaseAdder = 0.0f; phaseAdder2 = 0.0f; phaseAdder3 = 0.0f; phaseAdder4 = 0.0f;
phaseAdderTarget = 0.0f; phaseAdderTarget2 = 0.0f; phaseAdderTarget3 = 0.0f; phaseAdderTarget4 = 0.0f;
volume = 0.1f;
bNoise = false;
lAudio.assign(bufferSize, 0.0);
rAudio.assign(bufferSize, 0.0);
lAudio2.assign(bufferSize, 0.0);
rAudio2.assign(bufferSize, 0.0);
soundStream.setup(this, 2, 0, sampleRate, bufferSize, 4);
targetFrequency = 440.0f;
phaseAdderTarget = (targetFrequency / (float) sampleRate) * TWO_PI;
//pythagorean 5th
phaseAdderTarget2 = ((targetFrequency * 1.5f) / (float) sampleRate) * TWO_PI;
//pythagorean major third (plus an octave)
phaseAdderTarget3 = (((targetFrequency * 2.0f) * (81.0f / 64.0f)) / (float) sampleRate) * TWO_PI;
//pythagorean major seventh (plus an octave)
phaseAdderTarget4 = (((targetFrequency * 2.0f) * (243.0f / 128.0f)) / (float) sampleRate) * TWO_PI;
pan = 0.5f;
ofSetFrameRate(60);
}
//--------------------------------------------------------------
void testApp::update(){
ofBackground(100,100,100);
bool bNewFrame = false;
vidGrabber.grabFrame();
bNewFrame = vidGrabber.isFrameNew();
if (bNewFrame) {
colorImg.setFromPixels(vidGrabber.getPixels(), 320,240);
grayImage = colorImg;
if (bLearnBakground == true){
grayBg = grayImage; // the = sign copys the pixels from grayImage into grayBg (operator overloading)
bLearnBakground = false;
}
// take the abs value of the difference between background and incoming and then threshold:
grayDiff.absDiff(grayBg, grayImage);
grayDiff.threshold(threshold);
contourFinder.findContours(grayDiff, 20, (340*240)/3, MIN_BLOB_SIZE, false);
}
}
//--------------------------------------------------------------
void testApp::draw(){
// draw the incoming, the grayscale, the bg and the thresholded difference
ofSetHexColor(0xffffff);
//colorImg.draw(20,20);
grayImage.draw(360,20);
grayBg.draw(20,280);
grayDiff.draw(360,280);
// then draw the contours:
ofFill();
ofSetHexColor(0x333333);
ofRect(20,20,320,240);
ofSetHexColor(0xffffff);
// we could draw the whole contour finder
//contourFinder.draw(360,540);
if (catchButtons) {
numButtons = 0;
}
int buttonCounter = 0;
// or, instead we can draw each blob individually,
// this is how to get access to them:
for (int i = 0; i < contourFinder.nBlobs; i++){
if (isInLowerHalf(contourFinder.blobs[i].centroid)) {
contourFinder.blobs[i].draw(20,20);
if (catchButtons && buttonCounter < NUM_BUTTONS) {
ofRectangle rect = contourFinder.blobs[i].boundingRect;
buttons[buttonCounter++] = rect;
}
}
}
if (catchButtons) {
numButtons = buttonCounter;
bLearnBakground = true;
}
catchButtons = false;
for (int i=0; i < numButtons || i == NUM_BUTTONS; i++) {
isButtonOn[i] = false;
ofRectangle shiftedRect = buttons[i];
shiftedRect.x+= 20;
shiftedRect.y+= 20;
ofFill();
ofSetColor(reds[i], greens[i], blues[i]);
ofRect(shiftedRect);
//turn buttons on
for (int j = 0; j < contourFinder.nBlobs; j++) {
bool isInside = false;
ofRectangle intersectRect =
grayImage.getIntersectionROI(contourFinder.blobs[j].boundingRect, buttons[i]);
if ( intersectRect.width > 0 && intersectRect.height > 0 )
isInside = true;
if (isInside) {
isButtonOn[i] = true;
break;
}
}
}
// finally, a report:
ofSetHexColor(0xffffff);
char reportStr[1024];
sprintf(reportStr, "bg subtraction and blob detection\npress ' ' to capture bg\nthreshold %i (press: +/-)\nnum blobs found %i, fps: %f", threshold, contourFinder.nBlobs, ofGetFrameRate());
ofDrawBitmapString(reportStr, 20, 600);
}
//--------------------------------------------------------------
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;
case 'c':
catchButtons = true;
break;
case 'e':
for (int i=0; i < NUM_BUTTONS; i++) isButtonOn[i] = false;
numButtons = 0;
break;
}
}
//--------------------------------------------------------------
void testApp::keyReleased(int key){
}
//--------------------------------------------------------------
void testApp::mouseMoved(int x, int y ){
}
//--------------------------------------------------------------
void testApp::mouseDragged(int x, int y, int button){
}
//--------------------------------------------------------------
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){
}
//--------------------------------------------------------------
void testApp::gotMessage(ofMessage msg){
}
//--------------------------------------------------------------
void testApp::dragEvent(ofDragInfo dragInfo){
}
bool testApp::isInLowerHalf(ofPoint p) {
int cutoff = 240 - 240 / 2;
return p.y > cutoff? true : false;
}
void testApp::audioOut(float * output, int bufferSize, int nChannels){
float leftScale = 1 - pan;
float rightScale = pan;
volume = 0.1f;
// sin (n) seems to have trouble when n is very large, so we
// keep phase in the range of 0-TWO_PI like this:
while (phase > TWO_PI){
phase -= TWO_PI;
}
phaseAdder = 0.95f * phaseAdder + 0.05f * phaseAdderTarget;
phaseAdder2 = 0.95f * phaseAdder2 + 0.05f * phaseAdderTarget2;
phaseAdder3 = 0.95f * phaseAdder3 + 0.05f * phaseAdderTarget3;
phaseAdder4 = 0.95f * phaseAdder4 + 0.05f * phaseAdderTarget4;
for (int i = 0; i < bufferSize; i++){
phase += phaseAdder; phase2 += phaseAdder2; phase3 += phaseAdder3; phase4 += phaseAdder4;
float sample = sin(phase);
float sample2 = sin(phase2);
float sample3 = sin(phase3);
float sample4 = sin(phase4);
float sample_left = 0.0f;
float sample_right = 0.0f;
if (isButtonOn[0])
sample_left += sample;
if (isButtonOn[1])
sample_right += sample2;
lAudio[i] = output[i*nChannels ] = sample_left * volume * leftScale;
rAudio[i] = output[i*nChannels + 1] = sample_right * volume * rightScale;
}
}