Enumerations #
| Name |
Values |
|
This class exposes no enumerations. |
Constants #
| Name |
Type |
Value |
|
|
This class exposes no constants. |
Events #
| Definition |
Description |
| SignatureChanged() |
Fired when the user release the mouse button or raises their finger from the screen. |
Methods #
| Definition |
Description |
| Load(ImageData as String) |
Loads a signature image from fully-qualified, base64-encoded data. Must include the “data:image/png;base64,” header included with output. |
| Clear() |
Clears the canvas for a new signature. |
Properties #
| Name |
Type |
Default Value |
Description |
| PenColor |
Color |
&c000000 |
Determines the color used in the handwriting. |
| SignatureData |
String |
“” |
BASE64 data of the signature image currently being displayed. |
| SignatureImage |
Picture |
Nil |
Signature Image currently being displayed. |
Examples #
Converting to JPEG or other format that doesn’t support alpha channels #
GraffitiSignature returns PNG-formatted data where the actual drawing is placed in a transparent layer. Due to this, if you try to convert directly to a JPEG or other format that doesn’t support alpha channels, you’ll end up with the drawing on a black background. Unless you’ve changed the PenColor, you’ll end up with a black signature on a black background. The following code in the SignatureChanged event will create a non-transparent version of the signature:
var pToJPEG as new Picture( me.SignatureImage.Width, me.SignatureImage.Height )
var g as Graphics = pToJPEG.Graphics
g.DrawingColor = &cFFFFFF
g.FillRectangle( 0, 0, g.Width, g.Height )
g.DrawPicture( me.SignatureImage, 0, 0 )
var dataJPEG as String = pToJPEG.ToData(Picture.Formats.JPEG, 50)
