C++ ofPolyline::isClosed方法代码示例

void ofxPolyline2Mesh::updateShape(const ofPolyline &polyline)
{
	shape.clear();
	norm.clear();

	for (int i = 0; i < polyline.size(); i++)
	{
		shape.push_back(polyline[i]);
	}

	if (polyline.isClosed())
		shape.push_back(polyline[0]);

	const ofVec3f V(0, 0, -1);

	for (int i = 0; i < shape.size() - 1; i++)
	{
		const ofVec3f& p1 = shape[i];
		const ofVec3f& p2 = shape[i + 1];
		const ofVec3f& n21 = (p2 - p1).normalized();

		norm.push_back(n21.crossed(V));
	}

	{
		const ofVec3f& p1 = shape[shape.size() - 1];
		const ofVec3f& p2 = shape[0];
		const ofVec3f& n21 = (p2 - p1).normalized();

		norm.push_back(n21.crossed(V));
	}

	current_segments.resize(shape.size());
	last_segments.resize(shape.size());
}

void ofCairoRenderer::draw(ofPolyline & poly){
	cairo_new_path(cr);
	for(int i=0;i<(int)poly.size();i++){
		cairo_line_to(cr,poly.getVertices()[i].x,poly.getVertices()[i].y);
	}
	if(poly.isClosed())
		cairo_close_path(cr);
	cairo_stroke( cr );
}

//--------------------------------------------------------------
void ofApp::keyPressed(int key){
    switch(key) {
        case 'R': bRotate ^= true; if(!bRotate) rotAngle = 0; break;
        case 'r': poly.clear(); break;
        case 'c': poly.curveTo(mouseX, mouseY); break;
        case 'a': poly.arc(mouseX, mouseY, 50, 50, 0, 180); break;
        case 'o': poly.setClosed(!poly.isClosed()); break;
            
        case 'F': poly.simplify(10); break;
        case 'M': poly = poly.getSmoothed(5); break;
        case 'S': poly = poly.getResampledBySpacing(30); break;
        case 'C': poly = poly.getResampledByCount(50); break;
            
        case 'l': poly.setClosed(!poly.isClosed());
            
        case 'i': poly.insertVertex(ofPoint(mouseX, mouseY, 0), nearestIndex); break;
    }
}

//----------------------------------------------------------
void ofGLRenderer::draw(ofPolyline & poly){
	// use smoothness, if requested:
	if (bSmoothHinted) startSmoothing();

	glEnableClientState(GL_VERTEX_ARRAY);
	glVertexPointer(3, GL_FLOAT, sizeof(ofVec3f), &poly.getVertices()[0].x);
	glDrawArrays(poly.isClosed()?GL_LINE_LOOP:GL_LINE_STRIP, 0, poly.size());

	// use smoothness, if requested:
	if (bSmoothHinted) endSmoothing();
}

void ofxPolylineSave(ofPolyline & poly, string xmlPath) {
    ofXml xml;
    xml.addChild("poly");
    xml.setAttribute("closed", ofToString(poly.isClosed()));
    for(int i=0; i<poly.size(); i++) {
        ofPoint & point = poly.getVertices()[i];
        
        xml.addChild("point");
        xml.setToChild(i);
        xml.setAttribute("x", ofToString(point.x));
        xml.setAttribute("y", ofToString(point.y));
        xml.setToParent();
    }

    xml.save(xmlPath);
}

void Rift::setup(ofPolyline initial)
{
    if (!initial.isClosed())
    {
        do_open = true;
        initial_line = initial;
        points.clear();
        points.addVertex(initial_line.getPointAtPercent(0.49));
        points.addVertex(initial_line.getPointAtPercent(0.51));
        points.close();
    }
    else
    {
        do_open = false;
        points = initial;
    }
    meta.clear();
    float current_time = ofGetElapsedTimef();
    for (int i = 0; i < points.size(); i ++)
    {
        meta.push_back( (PointMeta) {false, current_time} );
    }
    resample();
}

//--------------------------------------------------------------
void ofApp::draw(){
    if(poly.size() < 2) return;
    
    ofPushMatrix();
    ofTranslate(ofGetWidth()/2, ofGetHeight()/2);
    ofRotateY(rotAngle);
    
    ofSetColor(255, 255, 255);
    poly.draw();
    
    ofSetColor(0, 255, 0);
    ofSetRectMode(OF_RECTMODE_CENTER);
    glPointSize(5);
    glBegin(GL_POINTS);
    for(int i=0; i<poly.size(); i++) {
        ofPoint p = poly[i];
        glVertex3f(p.x, p.y, p.z);
    }
    glEnd();
    
    for(int i=0; i<poly.size(); i++) {
        ofPoint p = poly[i];
        ofSetColor(255, 0, 0);
        ofLine(p, p + poly.getTangentAtIndex(i) * 20);
        
        ofSetColor(0, 255, 0);
        ofLine(p, p + poly.getNormalAtIndex(i) * 20);
        
        ofSetColor(0, 128, 255);
        ofLine(p, p + poly.getRotationAtIndex(i) * 20);
    }
    
    
    
    float totalLength = poly.getPerimeter();
    float totalArea = poly.getArea();
    ofPoint nearestPoint = poly.getClosestPoint(ofPoint(mouseX-ofGetWidth()/2, mouseY-ofGetHeight()/2), &nearestIndex);
    ofPoint nearestDataPoint = poly[nearestIndex];
    float lengthAtIndex = poly.getLengthAtIndex(nearestIndex);
    ofPoint pointAtIndex = poly.getPointAtIndexInterpolated(nearestIndex);
    ofPoint pointAtLength = poly.getPointAtLength(lengthAtIndex);
    ofPoint pointAtPercent = poly.getPointAtPercent(lengthAtIndex / totalLength);
    float indexAtLength = poly.getIndexAtLength(lengthAtIndex);
    
    float sinTime = ofMap(sin(ofGetElapsedTimef() * 0.5), -1, 1, 0, 1);
    float sinIndex = sinTime * (poly.isClosed() ? poly.size() : (poly.size()-1));  // sinTime mapped to indices direct
    float sinIndexLength = poly.getIndexAtPercent(sinTime); // sinTime mapped to indices based on length
    
    float lengthAtIndexSin = poly.getLengthAtIndexInterpolated(sinIndex);
    ofPoint pointAtIndexSin = poly.getPointAtIndexInterpolated(sinIndex);
    ofPoint pointAtPercentSin = poly.getPointAtPercent(sinTime);
    
    float angleAtIndex = poly.getAngleAtIndex(nearestIndex);
    float angleAtIndexSin = poly.getAngleAtIndexInterpolated(sinIndex);
    
    ofVec3f rotAtIndex = poly.getRotationAtIndex(nearestIndex);
    ofVec3f rotAtIndexSin = poly.getRotationAtIndexInterpolated(sinIndex);
    
    float rotMagAtIndex = rotAtIndex.length();
    float rotMagAtIndexSin = rotAtIndexSin.length();
    
    ofVec3f normalAtIndex = poly.getNormalAtIndex(nearestIndex);
    
    ofVec3f tangentAtIndexSin = poly.getTangentAtIndexInterpolated(sinIndex);
    ofVec3f normalAtIndexSin = poly.getNormalAtIndexInterpolated(sinIndex);
    ofVec3f rotationAtIndexSin = poly.getRotationAtIndexInterpolated(sinIndex);
    
    
    ofNoFill();
    ofSetLineWidth(2);
    
    ofSetColor(255, 0, 0);
    ofCircle(nearestPoint, 5);
    
    ofSetColor(255, 255, 0);
    ofCircle(nearestDataPoint, 7);
    
    // interpolating on indices
    {
        ofPoint p = poly.getPointAtIndexInterpolated(sinIndex);

        ofSetColor(0, 255, 255);
        ofCircle(p, 10);
        
        ofSetColor(255, 0, 0);
        ofLine(p, p + poly.getTangentAtIndexInterpolated(sinIndex) * 60);
        
        ofSetColor(0, 255, 0);
        ofLine(p, p + poly.getNormalAtIndexInterpolated(sinIndex) * 60);
        
        ofSetColor(0, 128, 255);
        ofLine(p, p + poly.getRotationAtIndexInterpolated(sinIndex) * 60);
    }
    
    // interpolating on length percentages
    {
        ofPoint p = poly.getPointAtIndexInterpolated(sinIndexLength);
        
        ofSetColor(255, 0, 255);
//.........这里部分代码省略.........

void ofGLRenderer::draw(ofPolyline & poly){
	glVertexPointer(poly.is3D()?3:2, GL_FLOAT, sizeof(ofVec3f), &poly.getVertices()[0].x);
	glDrawArrays(poly.isClosed()?GL_LINE_LOOP:GL_LINE_STRIP, 0, poly.size());;
}