ofApp.cpp

#include "ofApp.h"


float theta,theta2;


//--------------------------------------------------------------
void ofApp::setup(){
    theta = 0;
    theta2 = PI/2;
}

//--------------------------------------------------------------
void ofApp::update(){
    
}

//--------------------------------------------------------------
void ofApp::draw(){

    ofPushMatrix();
    ofTranslate(ofGetWidth()/2, ofGetHeight()/2);

    float _beginAngle = ofRadToDeg(theta);
    float _endAngle = ofRadToDeg(theta2);
    float _radius = 80;
    float _thickness = 10;
    
    // Increase the angle over time
    theta += 0.02;
    theta2 += 0.02;
    
    //draw section arc
    
    ofPath inner_pLine;
    //    inner_pLine.setMode(ofPath::POLYLINES);
    inner_pLine.setCircleResolution(200);
    
    inner_pLine.arc( 0, 0, _radius, _radius, _beginAngle, _endAngle);
    inner_pLine.close();
    inner_pLine.arc( 0, 0, _radius+_thickness, _radius+_thickness,_beginAngle,_endAngle);
    
    inner_pLine.close();
    
    inner_pLine.setColor(ofColor(255,0,0));
    inner_pLine.draw();
    
    
    float _midAngle = _beginAngle + (_endAngle-_beginAngle)/2;
    float x = _radius * cos(ofDegToRad(_midAngle));
    float y = _radius * sin(ofDegToRad(_midAngle));
    
    ofSetColor(255);
    ofDrawBitmapString("a", x, y);
    
    
    ofPopMatrix();
    
    ofDrawBitmapStringHighlight("theta "+ofToString(theta)+" , deg "+ofToString(_beginAngle),20,20);
    ofDrawBitmapStringHighlight("theta2 "+ofToString(theta)+" , deg "+ofToString(_endAngle),20,40);


}


//--------------------------------------------------------------
void ofApp::keyPressed(int key){
    if(key == '-'){
        theta -= 0.02;
        theta2 -= 0.02;
    }
    if(key == '='){
        theta += 0.02;
        theta2 += 0.02;
    }
}

//--------------------------------------------------------------
void ofApp::keyReleased(int key){

 }

//--------------------------------------------------------------
void ofApp::mouseMoved(int x, int y){
    
}

//--------------------------------------------------------------
void ofApp::mouseDragged(int x, int y, int button){
    
}

//--------------------------------------------------------------
void ofApp::mousePressed(int x, int y, int button){
    
}

//--------------------------------------------------------------
void ofApp::mouseReleased(int x, int y, int button){
    
}

//--------------------------------------------------------------
void ofApp::mouseEntered(int x, int y){
    
}

//--------------------------------------------------------------
void ofApp::mouseExited(int x, int y){
    
}

//--------------------------------------------------------------
void ofApp::windowResized(int w, int h){
    
}

//--------------------------------------------------------------
void ofApp::gotMessage(ofMessage msg){
    
}

//--------------------------------------------------------------
void ofApp::dragEvent(ofDragInfo dragInfo){ 
    
}