Using Ccaction to realize the carousel draw

With the help of Cocos2dx's own Ccmoveby and Cceaseinout, the current popular carousel draw effect is realized.

Creates a secondary node node_projection_ that maps the ordinal pos of the selected Sprite in the turntable to the x-coordinate of the node_projection_. When Node_projection_ executes Ccmoveby, it refreshes the sprite state in the turntable by roll_update (float DT) of the callback function executed at each frame. The distance of the Node_projuction_ on the x-axis determines the position of the final highlight of the turntable.

1 voidLayerroll::roll (ccobject* Psender, cccontroleventEvent)2 {3     4Node_projection_->setposition (CCP (0,0));5Spr_num_ =5;6Roll_index_ =1+ rand ()%5;7     8     intrount_t =4; number of//round_time cycles9Roll_unit_l_ = +; Node_projection the length of the moving unitTen     intLength = roll_unit_l_*spr_num_*rount_t + roll_unit_l_*roll_index_; One    Acccallfunc* mend = Cccallfunc::create ( This, Callfunc_selector (layerroll::roll_end)); -ccmoveby* mov = ccmoveby::create (4.0f, CCP (length,0)); -      theccsequence* seq = ccsequence::create (cceaseinout::create (MOV,1.5f), mend, NULL); Cceaseinout Slow Speed effect -Node_projection_->runaction (seq); - Schedule (Schedule_selector (layerroll::roll_update)); -      + } -  + voidlayerroll::roll_end () A { at      - Unschedule (Schedule_selector (layerroll::roll_update)); - } -  - voidLayerroll::roll_update (floatDT) - { in     intpos = node_projection_->Getpositionx (); -pos = pos% (roll_unit_l_*spr_num_);  topos = pos/roll_unit_l_+1; +     if(pos = =1) -     { theSpr_1_->setscale (0.8f); *     } $     ElsePanax Notoginseng     { -Spr_1_->setscale (0.6f); the     } +     if(pos==2) A     { theSpr_2_->setscale (0.8f); +  -     } $     Else $     { -Spr_2_->setscale (0.6f); -  the     } -     if(pos==3)Wuyi     { theSpr_3_->setscale (0.8f); -  Wu     } -     Else About     { $Spr_3_->setscale (0.6f); -  -     } -     if(pos = =4) A     { +Spr_4_->setscale (0.8f); the  -     } $     Else the     { theSpr_4_->setscale (0.6f); the  the     } -     if(pos = =5) in     { theSpr_5_->setscale (0.8f); the  About     } the     Else the     { theSpr_5_->setscale (0.6f); +  -     } the}

The number of dials here is 5.

Using Ccaction to realize the carousel draw