Monday, January 25, 2016

Re: Is there any GWT library to be used in client side that does the same thing as Scalr (scale and reduze image file sizes)?

Thanks for your answer Greg!

Actually, i really need a byte array because i will store it in a BLOB database column.

Regards!

2016-01-25 12:43 GMT-02:00 Greg <grz3gorz.nowak@gmail.com>:
Just use context.getCanvas().toDataUrl(); which will return data uri with the contents of the canvas. You can use it directly in <img src=""> element or send it to server.

On Monday, January 25, 2016 at 3:19:03 PM UTC+1, Julio Heitor Nobrega wrote:
I have just found an example (http://c.gwt-examples.com/home/ui/canvas).

The only problem is to convert ImageData to an byte array :)

Regards!



2016-01-25 12:08 GMT-02:00 Julio Heitor Nobrega <julioh...@gmail.com>:
Does anyone have some examples regarding the Canvas class?

I've seen the java doc API but the only methods i think that could be useful was:

Context2d getContext2d()
          Returns a 2D rendering context.
 void setCoordinateSpaceHeight(int height)
          Sets the height of the internal canvas coordinate space. 
void
setCoordinateSpaceWidth(int width)
          Sets the width of the internal canvas coordinate space. 

2016-01-14 16:36 GMT-02:00 Kirill Prazdnikov <pki...@gmail.com>:
Canvas is an DOM Element.
It can render Image Elements to itself in any resolution.
However it may produce not nice results.

It depends on what you need.

On Thursday, January 14, 2016 at 9:17:36 PM UTC+3, Julio Heitor Nobrega wrote:
Hi guys,

thanks everyone for the answers!

Greg,  is Canvas a GWT framework or its a class that belong to GWT itself?

Do you have any example of use?

Regards



Em quinta-feira, 14 de janeiro de 2016 11:25:29 UTC-2, Julio Heitor Nobrega escreveu:
Hi guys,

i am trying to upload images with 2mb size but i don't want to send the whole original image to the server.

What i would like to do is reduce the image dimensions from, for example, 1000x1000 to 50x50 and reduce the file size
from 2mb to ~25kb as well and at the end send the ~25kb image to the server.

I know there is the Scalr framework that does that in java, but its no compatible with GWT clients.

Is there any client side GWT library that does the same thing as Scalr?

Best Regards!


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