本文整理汇总了C++中ofPolyline::getTangentAtIndex方法的典型用法代码示例。如果您正苦于以下问题：C++ ofPolyline::getTangentAtIndex方法的具体用法？C++ ofPolyline::getTangentAtIndex怎么用？C++ ofPolyline::getTangentAtIndex使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类ofPolyline的用法示例。
在下文中一共展示了ofPolyline::getTangentAtIndex方法的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: makeCorner
void Plant::makeCorner(ofPolyline *line, ofPolyline &l, int i, float angle, float length){
ofVec2f v = l.getTangentAtIndex(i);
ofVec2f p = l.getVertices()[i] + v.rotate(angle)*length;
ofVec2f v1 = l.getTangentAtIndex(i-1);
ofVec2f pp = l.getVertices()[i-1] + v1.rotate(angle)*length;
ofVec2f v2 = l.getTangentAtIndex(i+1);
ofVec2f pn = l.getVertices()[i+1] + v2.rotate(angle)*length;
ofVec2f deltaPP = p - pp;
ofVec2f deltaPN = pn - p;
float radius = MIN(pp.distance(p)/3, p.distance(pn)/3);
ofVec2f rad = deltaPP.normalize()*radius;
ofVec2f rad2 = deltaPN.normalize()*radius;
ofVec2f b1 = p + (deltaPP-rad);
ofVec2f b2 = p + rad2;
line->lineTo(b1);
line->bezierTo(b1, p, b2);
line->lineTo(b2);
// debug points
// ofSetColor(ofColor::red);
// ofDrawCircle(b2, 2);
//
// ofSetColor(ofColor::yellow);
// ofDrawCircle(b1, 2);
// ofSetColor(ofColor::blue);
// ofDrawCircle(pp, 2);
//
// ofSetColor(ofColor::green);
// ofDrawCircle(pn, 5);
}示例2: makeStroke
void Plant::makeStroke(int i,
float min,
float max,
ofPolyline ¢erLine,
ofPolyline *line1,
ofPolyline *line2
){
ofVec2f v = centerLine.getTangentAtIndex(i);
float length = ofMap(i, 0, centerLine.size()-1, max, min) ;
float angle = 90;
float hackValue = 0.8;
if(i==0 || i == centerLine.size()-1){
ofVec2f p = centerLine.getVertices()[i] + v.rotate(angle)*length*hackValue;
ofVec2f v2 = centerLine.getTangentAtIndex(i);
ofVec2f p2 = centerLine.getVertices()[i] + v2.rotate(-angle)*length*hackValue;
line1->lineTo(p);
line2->lineTo(p2);
}
if(i>0 && i < centerLine.size()-1){
makeCorner(line1, centerLine, i, angle, length);
makeCorner(line2, centerLine, i, -angle, length);
}
if(i == centerLine.size()-1){
ofVec2f v = centerLine.getTangentAtIndex(i);
float length = ofMap(i, 0, centerLine.size()-1, min, min) ;
ofVec2f _p2 = centerLine.getVertices()[i] + v.rotate(90)*length*hackValue;
ofVec2f _p1 = centerLine.getVertices()[i] + v.rotate(180)*length*hackValue;
ofVec2f _p3 = _p1 + (_p2 - _p1)/2;
ofVec2f _delta = _p2 - _p1;
ofVec2f pCenter = _p3 - _delta.getPerpendicular()*min;
ofVec2f pLeft = pCenter - _delta/2;
ofVec2f pRight = pCenter + _delta/2;
line2->bezierTo(_p1, pLeft, pCenter);
line1->bezierTo(_p2, pRight, pCenter);
// ofSetColor(ofColor::yellow);
// ofDrawCircle(p1, 5);
// ofSetColor(ofColor::red);
// ofDrawCircle(p2, 5);
// ofSetColor(ofColor::blueViolet);
// ofDrawCircle(p3, 5);
// ofSetColor(ofColor::darkMagenta);
// ofDrawCircle(pCenter, 5);
// ofSetColor(ofColor::lightPink);
// ofDrawCircle(pLeft, 5);
// ofSetColor(ofColor::lightSkyBlue);
// ofDrawCircle(pRight, 5);
}
}示例3: draw
//--------------------------------------------------------------
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.........