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Sprite Crop


hungrybutterfly
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I'm trying to dynamically crop an image many times. Imagine many jigsaw pieces made from a single source image.

 

Initially I reached for Sprite.crop but it seems that all sprites using the same image will render with the same cropping rather than unique cropping. It seems to end up being a property of the image rather than the sprite.

 

I tried changing the Sprite.textureRegion without effect.

 

I thought I could dynamically create a texture atlas to represent the different pieces... but I'm not sure how.

 

To be clear I need this to be dynamic so the user can select the complexity of the jigsaw and I can build the pieces at run time.

 

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Ok I finally figured it out but it's not nice.

 

Basically I followed the "local json object.js" example to load in a texture with enough frames to cope with the maximum number of jigsaw pieces I might need. At this stage it doesn't matter what the position or size of each frame is because it's just a buffer. Then just before I create my sprites for each jigsaw piece I pick the next available frame from Phaser's framedata and fiddle the x/y/width/height as well as Pixi's texture cache (using Phaser's framedata.uuid).

 

Nasty but it works. If anyone wants code just let me know.

 

BTW thanks for the awesome engine!

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Ok here goes. At load time I load the texture with many blank frames like this...

var BaseName = "Test";var MaxNumFrames = 100;var ImageFileName = "assets/Images/Test.png"var NewJSON = {};NewJSON.frames = [];for( var i = 0;i < MaxNumFrames;i += 1 ){    var NewObject = {        filename : BaseName + i,        frame : {x:0,y:0,w:1,h:1},        rotated: false,        trimmed: true,        spriteSourceSize: {x:0,y:0,w:1,h:1},        sourceSize: {w:1,h:1}    }    NewJSON.frames.push(NewObject);}Game.Phaser.load.atlas(BaseName, ImageFileName, null, NewJSON);

Next I add a new function to the Phaser.cache like this...

changeFrame = function (Texture, key, x, y, Width, Height) {    var Frames = this._images[Texture].frameData._frames;    for( var i = 0;i < Frames.length;i += 1 )    {        if( Frames[i].name === key )        {            break;        }    }    var Index = i;    var Data = this._images[Texture].frameData._frames[Index];    Data.x = x;    Data.y = y;    Data.centerX = Width / 2;    Data.centerY = Height / 2;    Data.distance = Math.sqrt(Width * Width + Height * Height);    Data.width = Width;    Data.height = Height;    Data.sourceSizeW = Width;    Data.sourceSizeH = Height;    Data.spriteSourceSizeW = Width;    Data.spriteSourceSizeH = Height;        var Frame = Phaser.PIXI.TextureCache[Data.uuid];    Frame.width = Width;    Frame.height = Height;    Frame.frame.width = Width;    Frame.frame.height = Height;    Frame.frame.x = x;    Frame.frame.y = y;};Game.Phaser.cache.changeFrame = changeFrame;

Note I wasn't sure how get access to PIXI properly so I had to expose it by adding "PIXI: PIXI," to line 60 of phaser.js. Shame on me.

Finally I populate the frames each time start a new puzzle like this...

var BaseName = "Test"var NumPieces = 5;var PieceWidth = 10;var PieceHeight = 10;var NewSprites = [];for( var i = 0;i < NumPieces;i += 1 ){    var Name = BaseName + i;        // fiddle the frame    Game.Phaser.cache.changeFrame(BaseName, Name, i * PieceWidth, 0, PieceWidth, PieceHeight );        // create the sprite using the new frame    NewSprites[i] = Game.Phaser.add.sprite(i * PieceWidth, 0, BaseName, Name);} 

The result should be 5 sprites at 10x10 pixels in size.

 

Enjoy.

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