cocos2dx --- draw line

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 1 void DrawLine::draw(){
 2     drawLine();
 3 }
 4 void DrawLine::drawLine(){
 5     CCLog("DrawLayer draw line");
 6     int tickSubCount = 20;
 7     int pointListKeepCount = 500;
 8     for(int i=0; i<tickSubCount; ++i){
 9         if(pointList.size()>0){
10             pointList.pop_front();
11         }else{
12             break;
13         }
14     }
15     while(pointList.size()>pointListKeepCount){
16         pointList.pop_front();
17     }
18     float max_lineWidth = 6;
19     float min_lineWidth = 1;
20     int alpha_min = 10;
21     int alpha_max = 200;
22     int R = arc4random()%255;
23     int G = arc4random()%255;
24     int B = arc4random()%255;
25     int pointListCount = pointList.size();
26     list<CCPoint>::iterator it = pointList.begin();
27     float pointIndex = 0;
28     for(;it!=pointList.end();++it){
29         int distanceToMiddle = fabs(pointIndex-pointListCount/2);
30         float percent = 1.0-(float)distanceToMiddle/(float)(pointListCount/2.0);
31         float lineWidth = min_lineWidth + max_lineWidth*percent;
32         int alpha = alpha_min+alpha_max*percent;
33         ccDrawColor4B(R,G,B,alpha);
34         ccPointSize(lineWidth);
35         ccDrawPoint(*it);
36         pointIndex++;
37     }
38 }
39 void DrawLine::ccTouchesBegan(CCSet* touches,CCEvent* event){
40     CCLog("DrawLayer ccTouchesBegan");
41     CCSetIterator it = touches->begin();
42     CCTouch* touch = (CCTouch*)*it;
43     CCPoint beginPoint = touch->getLocationInView();
44     beginPoint = CCDirector::sharedDirector()->convertToGL(beginPoint);
45     pointList.push_back(beginPoint);
46 }
47 void DrawLine::ccTouchesMoved(CCSet* touches,CCEvent* event){
48     CCLog("DrawLayer ccTouchedMoved");
49     CCSetIterator it = touches->begin();
50     CCTouch* touch = (CCTouch*)*it;
51     CCPoint nextPoint = touch->getLocationInView();
52     nextPoint = CCDirector::sharedDirector()->convertToGL(nextPoint);
53     CCPoint preMovePoint = touch->getPreviousLocationInView();
54     preMovePoint = CCDirector::sharedDirector()->convertToGL(preMovePoint);
55     float distance = ccpDistance(nextPoint,preMovePoint);
56     if(distance>1){
57         int d = (int)distance;
58         for(int i=0;i<d;++i){
59             float distanceX = nextPoint.x-preMovePoint.x;
60             float distanceY = nextPoint.y-preMovePoint.y;
61             float precent = i/distance;
62             CCPoint newPoint;
63             newPoint.x = preMovePoint.x+(distanceX*precent);
64             newPoint.y = preMovePoint.y+(distanceY*precent);
65             pointList.push_back(newPoint);
66         }
67     }
68 }
69 void DrawLine::ccTouchesEnded(CCSet* touches,CCEvent* event){
70     CCLog("DrawLayer ccTouchedEnded");
71     pointList.clear();
72 }

如果ccTouchesXXX事件没有响应，在init方法中设置CCDirector::sharedDirector()->getTouchDispatcher()->addStandardDelegate(this,0);touch详细细节，可以查看http://www.cnblogs.com/changchao/archive/2013/05/03/3057061.html

posted on 2013-05-03 17:28 chchpd 阅读(734) 评论(0) 收藏举报

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