Does Paper.js have helpers for canva's ImageData?

[Phyo Arkar Lwin]

Hello Paperjs

i am looking for a image helper library , I want to plot a lot of points (over couple millions) on canvas and only efficient way on Canvas is to mainipulate ImageData array and it is quite hard.

I am new to this so , i am looking for a library and would like to know if paper.js have low level helpers for mainipulating imagedata , for example geometries as ImageData array (for circle, paths,etc) 

my plan is to plot circles as a scatterplot on 3000 x 3000 canvas and  let user to view each parts using a minimap.

I am new to this field and i would like some pointers (for minimap , viewport etc) too.

Thanks a lot!

[Tranek]

Is that something that Chart.js can do? http://www.chartjs.org/

[Jürg Lehni]

Paper.js doesn't really have this, but what it does support is rasterizing any item into a Raster, from which you could then access the image data through its undocumented Raster#getImageData(rect) method, e.g.:

var group = new Group(
new Path.Circle({
center: [100, 100],
radius: 100,
fillColor: 'red'
}),
new Path.Rectangle({
topLeft: [100, 100],
bottomRight: [200, 200],
fillColor: 'blue'
})
);
var raster = group.rasterize();
var imageData = raster.getImageData();

Look at the source code of Raster.js and you'll see.

Jürg

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[Phyo Arkar]

Oh thats gonna be very helpful! I will test it out!