GWT Canvas resize ImageData and get Canvas.toDataUrl

[Musicman75]

Hello,

for 2 days now I'm trying to resize my Canas data to get a smaller value when calling Canvas.toDataUrl.

The szenario:

User draws to a Canvas (Sign something). The drawing Canvas is sized to the Window size.
Before transgering the data to the server I want to scale the Canvas to fit to a smaller size.

I think this is very simple, but at the moment I'm bainfucked :-).

The steps:

- Get Canvas data
- Resize/Scale Canvas data
- Get data by calling Canvas.toDataUrl
- Transfer to server as image/png;base64..... String

Thanks a lot for any answer.

Stephan

[Musicman75]

By the way, I don't want to paint the resized image to the UI.
Only get the resized data to thranfer to the server.

[Thad]

I put my canvas info and a description of what I've drawn into a serializable POJO and send it to the server. On the server I create a java.awt.image.BufferedImage and draw to its java.awt.Graphics2D. Now call ImageIO.write(BufferedImage, "png", OutputStream) to write the file.