[COCOS2D-JS]CC. Rendertexture several uses (digital picture, scratch effect)

"Turn" http://blog.csdn.net/realcrazysun1/article/details/42393629

This article is based on the COCOS2D-JS 3.0 version engine development

Rendertexture usage 1: Digital pictures

Use this image to achieve any number

// Digital Picture Wizard

varPicturenumber =cc. Sprite.extend ({m_number:NULL, M_numbertexture:NULL, ctor:function(){         This. _super (); }, BuildNumber:function(Paramnumber, paramtexture) { This. Setnumber (Paramnumber);  This. Setnumbertexture (Cc.textureCache.addImage (paramtexture)); return  This. Build (); }, Build:function(){        varInumcount = ( This. m_number+ ""). Length;//get the number of characters        varStsize = This. M_numbertexture.getcontentsize ();//gets the texture size, requires that each number in the texture is equal to the width, and is arranged according to 0123456789                varInumwidth = parseint (STSIZE.WIDTH/10);//the width of each number in the texture        varInumheight = parseint (stsize.height);//the height of each number in the texture        varPRT =NewCc. Rendertexture (Inumwidth * inumcount, inumheight);//create a rendered texture object and number to determine the widthPrt.begin ();  for(vari = 0; i < Inumcount; i++)        {            varPsprite =NewCc. Sprite ();//Create a Sprite object for drawing numbersPsprite.setanchorpoint (0, 0); Psprite.settexture ( This. m_numbertexture); varInumber = ( This. m_number+ "") [i]; //sets the texture area to display the number, which refers to the area in the paramtexture of the parameter            varStrect =NewCc.rect (Inumber * inumwidth, 0, Inumwidth, inumheight); Psprite.settexturerect (Strect,false, Cc.size (Strect.width, strect.height)); Psprite.setposition (i* inumwidth, 0);//calculate the offset position of the displayPsprite.visit ();//rendering into PRT} prt.end (); //get the resulting texture         This. SetTexture (Prt.getsprite (). GetTexture ()); //set what is displayed        varStrect =NewCc.rect (0, 0, Inumwidth *Inumcount, inumheight);  This. Settexturerect (Strect,false, Cc.size (Strect.width, strect.height)); //By default, the texture obtained by ccrendertexture is inverted, which needs to be flipped         This. Setflippedy (true); }, Setnumber:function(paramnumber) { This. M_number =Paramnumber; }, GetNumber:function(){        return  This. M_number; }, Setnumbertexture:function(paramtexture) { This. M_numbertexture =paramtexture; }});

How to use:

var New Picturenumber ();        Pnum.buildnumber (1234567, "Res/number.png");        Pnum.setposition (a);        Pnum.setanchorpoint (0, 0);

Rendertexture Usage 2: Scratch effect

The main code is as follows:

varHelloworldlayer =cc. Layer.extend ({sprite:NULL, Peraser:NULL, Prtex:NULL, ctor:function () {        //////////////////////////////        //1. Super init First         This. _super (); varSize =cc.winsize; //add a "close" icon to exit the progress. It's an Autorelease object        varCloseitem =Newcc. Menuitemimage (Res. Closenormal_png, Res. Closeselected_png,function() {Cc.log ("Menu is clicked!"); },  This); Closeitem.attr ({x:size.width-20, y:20, Anchorx:0.5, Anchory:0.5        }); varmenu =Newcc.        Menu (Closeitem); menu.x= 0; Menu.y= 0;  This. AddChild (menu, 1); /////////////////////////////        //3. Add your codes below ...        //Add a label shows "Hello World"        //Create and initialize a label        varHellolabel =NewCc. Labelttf ("Hello World", "Arial", 38); //position the label on the center of thehellolabel.x = SIZE.WIDTH/2; Hellolabel.y= SIZE.HEIGHT/2; //Add the label as a child to this layer         This. AddChild (Hellolabel, 5); //Hello World background Image         This. Sprite =Newcc. Sprite (Res.        Helloworld_png);  This. sprite.attr ({x:size.width/2, Y:size.height/2,        });  This. AddChild ( This. Sprite, 0); //Rubber Eraser         This. Peraser =Newcc.           Drawnode ();  This. Peraser.drawdot (CC.P (0, 0), Cc.color (255, 255, 255, 0));  This. Peraser.retain (); //using Prtex to implement Eraser         This. Prtex =Newcc.        Rendertexture (Size.width,size.height);  This. Prtex.setposition (SIZE.WIDTH/2, SIZE.HEIGHT/2);  This. AddChild ( This. Prtex, 10); //load a picture waiting to be erased        varPBg =Newcc.        Sprite (res.dirt_png); Pbg.setposition (Size.width/2, SIZE.HEIGHT/2);  This. Prtex.begin ();        Pbg.visit ();  This. Prtex.end (); Cc.eventManager.addListener ({event:cc. Eventlistener.touch_one_by_one, Ontouchbegan:function(touches, event) {Cc.log ("Start"); vartarget =Event.getcurrenttarget (); return true; }, Ontouchmoved:function(Touch, event) {vartarget =Event.getcurrenttarget ();                Target.pEraser.setPosition (Touch.getlocation ());            Target.erasebyblend (); }        },  This); return true; }, Erasebyblend:function()    {         This. Peraser.setblendfunc (Cc.gl_one_minus_src_alpha, CC.             ZERO);  This. Prtex.begin ();  This. Peraser.visit ();  This. Prtex.end (); }    });

The results are as follows:

[COCOS2D-JS]CC. Rendertexture several uses (digital picture, scratch effect)