借助CCAction实现转盘抽奖

 1 void LayerRoll::roll(CCObject* pSender, CCControlEvent event)
 2 {
 3     
 4     node_projection_->setPosition(ccp(0, 0));
 5     spr_num_ = 5;
 6     roll_index_ =1+ rand() % 5;
 7     
 8     int rount_t = 4; //round_time 周期数
 9     roll_unit_l_ = 32;  //node_projection移动单元的长度
10     int length = roll_unit_l_*spr_num_*rount_t + roll_unit_l_*roll_index_;
11   12     CCCallFunc* mend = CCCallFunc::create(this, callfunc_selector(LayerRoll::roll_end));
13     CCMoveBy* mov = CCMoveBy::create(4.0f, ccp(length, 0));
14     
15     CCSequence* seq = CCSequence::create(CCEaseInOut::create(mov,1.5f), mend, NULL); //CCEaseInOut 慢快慢效果
16     node_projection_->runAction(seq);
17     schedule(schedule_selector(LayerRoll::roll_update));
18     
19 }
20 
21 void LayerRoll::roll_end()
22 {
23     
24     unschedule(schedule_selector(LayerRoll::roll_update));
25 }
26 
27 void LayerRoll::roll_update(float dt)
28 {
29     int pos = node_projection_->getPositionX();
30     pos = pos % (roll_unit_l_*spr_num_); 
31     pos = pos / roll_unit_l_+1;
32     if (pos == 1)
33     {
34         spr_1_->setScale(0.8f);
35     }
36     else
37     {
38         spr_1_->setScale(0.6f);
39     }
40     if (pos==2)
41     {
42         spr_2_->setScale(0.8f);
43 
44     }
45     else
46     {
47         spr_2_->setScale(0.6f);
48 
49     }
50     if (pos==3)
51     {
52         spr_3_->setScale(0.8f);
53 
54     }
55     else
56     {
57         spr_3_->setScale(0.6f);
58 
59     }
60     if (pos == 4)
61     {
62         spr_4_->setScale(0.8f);
63 
64     }
65     else
66     {
67         spr_4_->setScale(0.6f);
68 
69     }
70     if (pos == 5)
71     {
72         spr_5_->setScale(0.8f);
73 
74     }
75     else
76     {
77         spr_5_->setScale(0.6f);
78 
79     }
80 }