C++ ofPoint类代码示例

void ttRopeBasic::update(ofPoint AccFrc,ofPoint StartPos){

    accFrc = AccFrc;
    startPos = StartPos;
    endPos = StartPos;
    

    if(num_char == 0){
        if (accFrc.y<-0.15){
            endPos.y += ofMap(accFrc.y, -0.15, -0.6,  0, 1024-endPos.y, true);
            length = StartPos.distance(endPos);
            bFixedMove = true;
        }else{
            endPos.y = StartPos.y;
            length = StartPos.distance(endPos);
            bFixedMove = false;
        }
    }

    if (num_char == 1) {
        if (accFrc.y>0.15) {
            endPos.y -= ofMap(accFrc.y, 0.15, 0.6, 0, endPos.y,true);
            length = StartPos.distance(endPos);
            bFixedMove = true;
        }else{
            endPos.y = StartPos.y;
            length = StartPos.distance(endPos);
            bFixedMove = false;
        }
    }
    
    
    getPos = startPos;
    getLength = length;
}

WalkVect ofApp::createWalkVect(ofPoint velocity, ofPoint vector, IsLine line) {
    ofPoint dir = vector.normalize();
    if(velocity.y < 0) dir *= -1;
    WalkVect vect;
    vect.dir = dir;
    vect.spd = velocity.length();
    vect.line = line;
    return vect;
}

void ofApp::update(){
	mouse = ofPoint(mouseX, mouseY); 
	mouse -= center; 
	
	m = mouse.length(); 


	cout << m << " is the magnitude of m" <<endl; 
	//unit vectors 
	mouse.normalize(); 
	mouse*=50;
}

//--------
void ofApp::getLineEndPoints(ofxCvBlob blob, ofPoint &start, ofPoint &end) {

    start = blob.pts[0];
    end = blob.pts[1];
    float maxDist = start.distance(end);
    
    for(int i=0; i < blob.nPts; i++){
        
        if(blob.pts[i].distance(start) > maxDist) {
            end = blob.pts[i];
            maxDist = start.distance(end);
        }
    }
}

//----------------------------------------------------------
// http://local.wasp.uwa.edu.au/~pbourke/geometry/pointline/
static ofPoint getClosestPointUtil(const ofPoint& p1, const ofPoint& p2, const ofPoint& p3, float* normalizedPosition) {
	// if p1 is coincident with p2, there is no line
	if(p1 == p2) {
		if(normalizedPosition != NULL) {
			*normalizedPosition = 0;
		}
		return p1;
	}
	
	float u = (p3.x - p1.x) * (p2.x - p1.x);
	u += (p3.y - p1.y) * (p2.y - p1.y);
	// perfect place for fast inverse sqrt...
	float len = (p2 - p1).length();
	u /= (len * len);
	
	// clamp u
	if(u > 1) {
		u = 1;
	} else if(u < 0) {
		u = 0;
	}
	if(normalizedPosition != NULL) {
		*normalizedPosition = u;
	}
	return p1.getInterpolated(p2, u);
}

    void mousePressed(int x, int y, int button) {
        x /= globalScale;
        y /= globalScale;

        canvas.mousePressed(x, y, button);
        side.mousePressed(x, y, button);
//        cout << btnHelpPos.distance(ofPoint(x,y)) << endl;
        if (btnHelpPos.distance(ofPoint(x,y))<btnHelp.width/2) showHelp();
        if (btnNew.hitTest(x,y)) { files.cur=-1; canvas.clear(); files.unloadFile(); }
        if (btnSave.hitTest(x,y)) files.save();
        if (btnLoadPrevious.hitTest(x,y)) files.loadPrevious();
        if (btnLoadNext.hitTest(x,y)) files.loadNext();
        if (btnPrint.hitTest(x,y)) print();
        if (btnStop.hitTest(x,y)) stop();
        if (btnOops.hitTest(x,y)) { btnOops.selected=true; }
        if (btnZoomIn.hitTest(x,y)) btnZoomIn.selected=true;
        if (btnZoomOut.hitTest(x,y)) btnZoomOut.selected=true;
        if (btnHigher.hitTest(x,y)) btnHigher.selected=true;
        if (btnLower.hitTest(x,y)) btnLower.selected=true;
        if (btnTwistLeft.hitTest(x,y)) btnTwistLeft.selected=true;
        if (btnTwistRight.hitTest(x,y)) btnTwistRight.selected=true;

        if (shapeButtons.inside(x,y)) {
            int index = ofNormalize(x,shapeButtons.x,shapeButtons.x+shapeButtons.width) * shapeString.size();
            side.setShape(shapeString.at(index));
        }
    }

ofPoint SuperGlyph::getGetClosePath(ofPoint _pos){
    
    ofPoint normal;
    ofPoint target;
    float minDist = 1000000;
    
    for (int i = 0; i < insidePath.getVertices().size()-1; i++) {
        
        ofPoint a = insidePath.getVertices()[i];
        ofPoint b = insidePath.getVertices()[i+1];
        
        ofPoint normalPoint = getNormalPoint(_pos, a, b);
        
        if (normalPoint.x < a.x || normalPoint.x > b.x) {
            normalPoint = b;
        }
        
        float distance = _pos.distance(normalPoint);
        
        if (distance < minDist) {
            minDist = distance;
            
            normal = normalPoint;
            
            ofPoint dir = b - a;
            dir.normalize();
            
            dir *= 10;
            target = normalPoint;
            target += dir;
        }
    }
    
    return target;
}

ofFloatColor getColor(ofPoint point)
{
	float max = 	point.lengthSquared();

		double r,g,b;
		double color =   (max / (maxDistance/13));
		if (color < 1)
		{
			r = (1 - color) ;
			g = color;
			b = 0;
		}
		else if (color < 2)
		{
			color--;
			r = 0;
			g = 1 - color;
			b = color;
		}
		else
		{
			r = 0;
			g = 0;
			b = 1;
		}

		return ofFloatColor(r,g,b);
}

//--------------------------------------------------------------
void testApp:: drawPointOnLine(ofPoint p1, ofPoint p2, float t){
    t = ofClamp(t, 0, 1);
    ofPoint circleCenter = p1.getInterpolated(p2, t);
    
    ofCircle(circleCenter, 5);
    ofLine(p1, p2);
    ofCircle(p1, 3);
    ofCircle(p2, 3);
}

void ofxMarchingCubes::vertexInterp(float threshold,const ofPoint& p1,const ofPoint& p2, float valp1, float valp2, ofPoint& theVertice){
	float mu;
	if (ABS(threshold-valp1) < 0.00001){
		theVertice.set(p1.x, p1.y, p1.z);
		return;
	}
	if (ABS(threshold-valp2) < 0.00001){
		theVertice.set(p2.x, p2.y, p2.z);
		return;
	}
	if (ABS(valp1-valp2) < 0.00001){
		theVertice.set(p1.x, p1.x, p1.z);
		return;
	}
	mu = (threshold - valp1) / (valp2 - valp1);
	theVertice.x = p1.x + mu * (p2.x - p1.x);
	theVertice.y = p1.y + mu * (p2.y - p1.y);
	theVertice.z = p1.z + mu * (p2.z - p1.z);
}

bool findClosestIntersectionLineAndPoly( ofPoint a, ofPoint b, vector<ofPoint> pts, ofPoint & closestPoint, int & sideId )
{
    if(pts.size() <= 0 ) return false;
	
	vector<float> dist;
    vector<ofPoint> ipts;
	vector<int> ids;
	
	//if( pts[0].x != pts[ pts.size()-1].x && pts[0].y != pts[ pts.size()-1].y)
	pts.push_back(pts[0]);
		
    for( int i = 1; i < pts.size(); i++)
    {
		ofPoint iPt;
		if ( intersectionTwoLines( pts[i-1], pts[i], a, b, &iPt ) )
		{
			dist.push_back( ( (a.x-iPt.x) *(a.x-iPt.x) + (a.y-iPt.y)*(a.y-iPt.y) ) );
			ipts.push_back( iPt );
			ids.push_back(i-1);
		}
    }
	
	closestPoint.set(0,0);
	if( ipts.size() <= 0 ) return false;
	
    ofPoint p = ofPoint(0,0);
    float cdist = 0;
	
    for( int i = 0; i < dist.size(); i++)
    {
        if( i == 0 || dist[i] < cdist )
        {
            cdist = dist[i];
            p.set( ipts[i].x,ipts[i].y );
			sideId = ids[i];
        }
    }
	
	closestPoint.set(p.x,p.y);
    
	return true;
	
}

	void update(){

		Hands= ofPoint(x,y); //location of the hands in the air  ( ir sensors)
		dir= ofPoint(Hands - location); 

		dir.normalize();
		dir *=0.01;
		accel= dir;

		velocity += accel; //speed
		location += velocity; // where is + the movement speed
		velocity.limit(maxspeed); //verctor doesnt get bigger then 3

		//collision target
		if(ofDist(Target.x,Target.y, location.x, location.y)<rectSize){
			points ++;
			Target=ofPoint(ofRandom(20,ofGetWidth()-20), ofRandom(20,ofGetHeight()-20));
			hitsound.play();
		}

	}

//Update vars based on Acceleration = Force/Mass
void Particle::refresh() {
    accel.x = force.x/mass;
    accel.y = force.y/mass;

    vel+= accel;
    pos += vel;
    
    //Restrict pos to window bounds
    //Find glancing direction by adding 180 - 2theta degrees
    
    //Left/Right border collision
    if(pos.x <= 0 || pos.x >= ofGetWindowWidth()) {
        float theta = vel.angle(ofPoint(0, 1));
        vel.rotate(180, ofPoint(0,1));
    }
    
    //Top/Bottom border collision
    if(pos.y <= 0 || pos.y >= ofGetWindowHeight()) {
        float theta = vel.angle(ofPoint(1, 0));
        vel.rotate(180, ofPoint(1,0));
    }
        
    accel = ofPoint(0,0);
}

void ofApp::drawVector(ofPoint v, ofPoint loc, float scayl){
    ofPushMatrix();
        float arrowsize = 4;
        // Translate to location to render vector
        ofTranslate(loc);
        ofColor(255);
        // Call vector heading function to get direction (note that pointing up is a heading of 0) and rotate
        float angle = (float)atan2(-v.y, v.x);
        float theta =  -1.0*angle;
        float heading2D = ofRadToDeg(theta);
        
        ofRotateZ(heading2D);
        
        // Calculate length of vector & scale it to be bigger or smaller if necessary
        float len = v.length()*scayl;
        // Draw three lines to make an arrow (draw pointing up since we've rotate to the proper direction)
        ofDrawLine(0,0,len,0);
        ofDrawLine(len,0,len-arrowsize,+arrowsize/2);
        ofDrawLine(len,0,len-arrowsize,-arrowsize/2);
    ofPopMatrix();
}

void Communitas::addParticle(ofPoint _pos, int _n) {
	if ( universe.inside( _pos ) ){
		timer = 0;

		int nLnk = 0;
		for (int i = pAct.size()-1; i >= 0 ; i--){
			if (nLnk == 0)
				if (pAct[i]->idN == _n)
					nLnk = i;

			if ( _pos.distance(pAct[i]->loc) <= 40)
				pAct[i]->alpha = 255;
		}

		LineDot * dot = new LineDot(_n, &universe, _pos ,false);

		if ( nLnk > 0) 
            dot->setLnk(pAct[nLnk]);

		pAct.push_back(dot);
	}
}