Cocos2dx 3.0 improve article (10) Resource Loading progress bar Loading...

This blog post was supposed to be written last night, but this morning I am going to take a driver's license examination. What I fear most is that my eyesight cannot reach 5.0, after all, it takes too long for this phase to face the screen.
So I barely touched my computer last night, didn't play with my cell phone, and went to bed early and got up early. Health Check passed!


First, I want to talk about the progress bar. Well, wait. Put away the angry watermelon knife in your hand first. I also know that TestCpp also has this example. But TestCpp only has label changes, and I add a progress bar.
Please give me a nice name for this kind of method: Click it!


Well, the steps are as follows:
1. Create label and progressTimer;
2. Load resources. The callback function is called every time a resource is loaded;
3. After loading, enter the new interface.

First, check the header file HelloWorld. h.

# Ifndef _ HELLOWORLD_SCENE_H __# define _ HELLOWORLD_SCENE_H __# include "cocos2d. h "class HelloWorld: public cocos2d: Layer {public: HelloWorld (): m_numSp (20), m_loadedSp (0), loadProgress (NULL) {}; static cocos2d :: scene * createScene (); virtual bool init (); void loadingCallback (Object * pSender); // destroy the void gotoNewLayer () function after loading an image (); // after loading, the jump function CREATE_FUNC (HelloWorld); private: cocos2d: ProgressTimer * loadProgress; // progress bar cocos2d: LabelTTF * percentLabel; // loading progress labelcocos2d :: labelTTF * loadLabel; // display the loading: labelint m_numSp; // Number of genie to be loaded. The value is initialized to 20 int m_loadedSp; // Number of loaded genie }; # endif/_ HELLOWORLD_SCENE_H __

1. Create

Size visibleSize = Director: getInstance ()-> getVisibleSize (); Point origin = Director: getInstance ()-> getVisibleOrigin (); loadLabel = LabelTTF: create ("Loading: "," Arial ", 20); // create labelloadLabel-> setPosition (Point (visibleSize. width/2-30, visibleSize. height/2 + 30); this-> addChild (loadLabel, 1); percentLabel = LabelTTF: create ("0%", "Arial", 20 ); // create labelpercentLabel-> setPosition (Point (visibleSize. width/2 + 35, visibleSize. height/2 + 30); this-> addChild (percentLabel, 2); auto loadBg = Sprite: create ("sliderTrack.png "); // process bar basemap loadBg-> setPosition (Point (visibleSize. width/2, visibleSize. height/2); this-> addChild (loadBg, 1); loadProgress = ProgressTimer: create (Sprite: create ("sliderProgress.png ")); // create a process BAR loadProgress-> setBarChangeRate (Point (1, 0); // set the variation rate of the Process BAR loadProgress-> setType (ProgressTimer: Type: BAR ); // set the process Bar type loadProgress-> setMidpoint (Point (0, 1); // set the progress direction loadProgress-> setPosition (Point (visibleSize. width/2, visibleSize. height/2); loadProgress-> setPercentage (0.0f); // set the initial value to 0this-> addChild (loadProgress, 2 );

2. Attach Images

// Load 20 images. Call the callback function: loadingCallbackDirector: getInstance ()-> getTextureCache ()-> addImageAsync ("HelloWorld.png", this, callback (HelloWorld: loadingCallback); ctor: getInstance ()-> getTextureCache ()-> addImageAsync ("HelloWorld1.png", this, callfuncO_selector (HelloWorld: loadingCallback )); director: getInstance ()-> getTextureCache ()-> addImageAsync ("HelloWorld2.png", this, callfuncO_selector (HelloWorld: loadingCallback); Director: getInstance () -> getTextureCache ()-> addImageAsync ("HelloWorld3.png", this, callfuncO_selector (HelloWorld: loadingCallback); Director: getInstance ()-> getTextureCache () -> addImageAsync ("HelloWorld4.png", this, callback (HelloWorld: loadingCallback); Director: getInstance ()-> getTextureCache ()-> addImageAsync ("HelloWorld5.png", this, callback (HelloWorld: loadingCallback); ctor: getInstance ()-> getTextureCache ()-> addImageAsync ("HelloWorld6.png", this, callfuncO_selector (HelloWorld: loadingCallback )); director: getInstance ()-> getTextureCache ()-> addImageAsync ("HelloWorld7.png", this, callfuncO_selector (HelloWorld: loadingCallback); Director: getInstance () -> getTextureCache ()-> addImageAsync ("HelloWorld.png", this, callfuncO_selector (HelloWorld: loadingCallback); Director: getInstance ()-> getTextureCache () -> addImageAsync ("HelloWorld.png", this, convert (HelloWorld: loadingCallback); Director: getInstance ()-> getTextureCache ()-> addImageAsync ("HelloWorld.png", this, callback (HelloWorld: loadingCallback); ctor: getInstance ()-> getTextureCache ()-> addImageAsync ("HelloWorld.png", this, callfuncO_selector (HelloWorld: loadingCallback )); director: getInstance ()-> getTextureCache ()-> addImageAsync ("HelloWorld.png", this, callfuncO_selector (HelloWorld: loadingCallback); Director: getInstance () -> getTextureCache ()-> addImageAsync ("HelloWorld.png", this, callfuncO_selector (HelloWorld: loadingCallback); Director: getInstance ()-> getTextureCache () -> addImageAsync ("HelloWorld.png", this, convert (HelloWorld: loadingCallback); Director: getInstance ()-> getTextureCache ()-> addImageAsync ("HelloWorld.png", this, callback (HelloWorld: loadingCallback); ctor: getInstance ()-> getTextureCache ()-> addImageAsync ("HelloWorld.png", this, callfuncO_selector (HelloWorld: loadingCallback )); director: getInstance ()-> getTextureCache ()-> addImageAsync ("HelloWorld.png", this, callfuncO_selector (HelloWorld: loadingCallback); Director: getInstance () -> getTextureCache ()-> addImageAsync ("HelloWorld.png", this, callfuncO_selector (HelloWorld: loadingCallback); Director: getInstance ()-> getTextureCache () -> addImageAsync ("HelloWorld.png", this, callfuncO_selector (HelloWorld: loadingCallback ));

3. Callback Function after image loading:

Void HelloWorld: loadingCallback (Object * pSender) {++ m_loadedSp; // every time you enter this function, let m_loadedSp + 1 char buf_str [16]; sprintf (buf_str, "% d %", (int) (float) m_loadedSp/m_numSp) * 100), m_numSp); percentLabel-> setString (buf_str ); // update the value float newPercent of percentLabel = 100-(float) m_numSp-(float) m_loadedSp)/(float) m_numSp/100 ); // calculate the current percentage of the progress bar. // because the image loading speed is very fast, ProgressTo, // or ProgressFromTo is not used to update the progress bar loadProgress-> setPercentage (newPercent ); // update progress bar // if (m_loadedSp = m_numSp) {this-> removeChild (loadProgress) after the image is loaded ); // Delete the added objects from this-> removeChild (percentLabel); this-> removeChild (loadLabel); // after loading, you must jump to gotoNewLayer, here you can // create a new Scene, a new Layer, or any other messy this-> gotoNewLayer ();}}

4. Enter the new interface

Void HelloWorld: gotoNewLayer () {auto size = Director :: getInstance ()-> getWinSize (); auto sp = Sprite: create ("HelloWorld.png "); // use the image previously loaded into the cache to create an genie. Sp-> setPosition (Point (size. width/2, size. height/2); this-> addChild (sp, 1 );}

Because the comments in the Code are quite detailed, I will not talk too much nonsense.
Well, it's done. I wrote this article after work and it rained heavily outside. I have to rush back for dinner. Windy male paper.


Respect Original, reprint please indicate the original address: http://blog.csdn.net/start530? Viewmode = contents