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Adding support to -distort command #745

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Adding support to -distort command #745

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2ba7f8b
Update args.js
xStarman Aug 27, 2018
6af65a9
Merge pull request #1 from xStarman/xStarman-distortcommand
xStarman Aug 27, 2018
d24feb1
Update README.md
xStarman Aug 27, 2018
e8aa419
Merge pull request #2 from xStarman/xStarman-distortioncommanddocs
xStarman Aug 27, 2018
056c15a
Update args.js
xStarman Jan 23, 2019
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16 changes: 16 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -126,6 +126,22 @@ gm(200, 400, "#ddff99f3")
.write("/path/to/brandNewImg.jpg", function (err) {
// ...
});

// distorting an image
// array of arrays with from -> to objects
// fx,fy -> tx,ty

// It will only works with imageMagick subclass
gm("image.jpg")
.distort([
[{x:99,y:71}, {x:0,y:0}],
[{x:299,y:71}, {x:479,y:0}],
[{x:100,y:270}, {x:0,y:477}],
[{x:299,y:270}, {x:479,y:476}],
])
.write("/path/to/brandNewImg.jpg", function (err) {
// ...
});
```

## Streams
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22 changes: 22 additions & 0 deletions lib/args.js
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Expand Up @@ -1103,6 +1103,28 @@ module.exports = function (proto) {
proto.background = function background (color) {
return this.in("-background", color);
}

//http://www.imagemagick.org/Usage/distorts/
proto.distort = function distort(pers, method){
if(!method){
method = "BilinearForward";
}
if(!this._options.imageMagick){
console.warn('Graphics Magick appears not to support the -distort option. Please use {imageMagick: true}\nDistort command was ignored!');
return this;
}
var perspectiveFrom = "";
pers.forEach(function(coordinate){
perspectiveFrom += coordinate[0].x.toString();
perspectiveFrom += ","
perspectiveFrom += coordinate[0].y.toString() +" ";
perspectiveFrom += coordinate[1].x.toString();
perspectiveFrom += ","
perspectiveFrom += coordinate[1].y.toString() +" ";
});

return this.out("-distort",method, perspectiveFrom.trim() );
}
};

/**
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