B4A Library SignPad V0.20 - Signature Capture - incl Java source

DonManfred · Jan 31, 2015

SignPad
Version: 0.20

Android Signature Pad is an Android library for drawing smooth signatures. It uses variable width Bézier curve interpolation based on Smoother Signatures.

For those who want to play with the library or mayybe to extend
i have included the java source of this library so you can change it by yourself and then recompile the lib with SLC. Have fun

This wrapper is based on this

SignPad
Events:
- onSigned (sign As Bitmap)
Methods:
- AddToParent (Parent As ViewGroup, left As Int, top As Int, width As Int, height As Int)
- Capture
- DesignerCreateView (base As PanelWrapper, lw As LabelWrapper, props As Map)
- Initialize (EventName As String)
- clear
- getAlbumStorageDir (albumName As String) As File
- saveBitmapToJPG (bitmap As Bitmap, photo As File)
Properties:
- Left As Int
- SignatureBitmap As Bitmap [read only]
- Top As Int
- TransparentSignatureBitmap As Bitmap [read only]

For those who want to extend the library i have attached the java-source of this library. FEEL FREE TO MODIFY IT

BarryW · Jul 2, 2015

Is there any way to change the background of your library or put an image to it?
Tnx...

fixit30 · Jul 2, 2015

You can place an image view behind the signpad and load your background image there.

somed3v3loper · Oct 1, 2015

Can we set line width ?

DonManfred · Oct 1, 2015

somed3v3loper said:
Can we set line width ?

try this version

B4X:

    SignaturePad.StrokeWidth = 25

somed3v3loper · Oct 1, 2015

DonManfred said:
try this version

B4X:

SignaturePad.StrokeWidth = 25

Thanks a lot . Can we get 0.21 source code ?

DonManfred · Oct 1, 2015

somed3v3loper said:
Can we get 0.21 source code ?

I have added it to #24

somed3v3loper · Oct 3, 2015

Hi again Manfred ,

I tried modifying source but when compiling with SLC and refreshing Libraries list I get this error :

B4X:

Error Parsing Libraries
com.github.gcacace.signaturepad.views.SignaturePad.strokewidth already exists.

I even commented strokewidth functions in original library and in wrapper but still the same error .

DonManfred · Oct 3, 2015

you need to add
com.github
to your b4ignore directive

If it is already empty then enter com.github
If not then add ",com.github" at the end

somed3v3loper · Oct 3, 2015

DonManfred said:
you need to add
com.github
to your b4ignore directive

If it is already empty then enter com.github
If not then add ",com.github" at the end

Thanks a lot
I added a function to set paint color to attached version .

rafaelmotaquintana · Mar 18, 2016

I get this error when trying the sample code published

B4A version: 5.50
Parsing code. (0.00s)
Compiling code. Error
Error compiling program.
Error description: Object reference not set to an instance of an object.
Occurred on line: 39
SignaturePad.Capture(False)
Word: (

fixit30 · Mar 18, 2016

rafaelmotaquintana said:
I get this error when trying the sample code published

B4A version: 5.50
Parsing code. (0.00s)
Compiling code. Error
Error compiling program.
Error description: Object reference not set to an instance of an object.
Occurred on line: 39
SignaturePad.Capture(False)
Word: (

How can we know what the problem is if you don't post your code?

rafaelmotaquintana · Mar 19, 2016

fixit30 said:
How can we know what the problem is if you don't post your code?

Its the sample code posted in the beginning of this thread, along with the library. I didn't touch it.

fixit30 · Mar 19, 2016

Change line 39 and 53 to:

B4X:

SignaturePad.Capture

rafaelmotaquintana · Mar 19, 2016

fixit30 said:
Change line 39 and 53 to:

B4X:

SignaturePad.Capture

Fixed! Thanks

alon · Dec 27, 2016

Hi ,
Is there a way to know if the signpad is clear/empty.

Thanks

Rusty · Aug 11, 2017

Great library...
I noticed several people asking if the signature has to occur with one line (i.e. touch and not lift until finished).
However, most people lift their finger during signature. For Example: John Smith would be at LEAST two touches.
However, when you lift your finger presumably after the word "John" is complete. the signature is finished and the event "onsigned" fires and the game is over...
Is there a way to allow John to lift his finger and then sign Smith without terminating the signature without firing the event?
(or to restart the signature and combine the strokes into one image)
thanks
Rusty

netsistemas · Jun 19, 2018

This is good solution and with qualty (don´t forget donate).

But,
How put a DOC / POINT in a sign?
Move point to point are ok, but if you need put a DOC over the 'i' , the library does not recognize the touch on the screen.
I can try to get this case in panel touch or similar, but i think that this is not good solution.

DonManfred · Jun 19, 2018

The lib does not support this. You need to write all in one "run".

As an alternative you can use https://www.b4x.com/android/forum/threads/signature-capture-tutorial.9096/

netsistemas · Jun 21, 2018

I install eclipse and your source code, config and view and understand your great code and DO IT!

(I change the JAVA library source code)

Important: There are several versions, you must get the last. This last version have any adicional property:

In B4A proyect add this code:
SignaturePad.StrokeWidth=5

SignaturePad.StrokeWidth=Value

In this version you can change the line with.

The first version is more pretty (i think), because have other tecnich for get the stock with, but is not easy for me implement the DOC over 'i' letter).

Solution (for java proyect):
In signaturePad.Java i add only one code line and works.

B4X:

    @Override
    public boolean onTouchEvent(MotionEvent event){
        float eventX = event.getX();
        float eventY = event.getY();

        switch (event.getAction()){
        case MotionEvent.ACTION_DOWN:
            getParent().requestDisallowInterceptTouchEvent(true);
            mPoints.clear();
            mPath.moveTo(eventX, eventY);
            mLastTouchX = eventX;
            mLastTouchY = eventY;
            addPoint(new TimedPoint(eventX, eventY));
            //ralonso add jun 2018 - it the stockwith is 1, the doc are not visible
            // SignaturePad.StrokeWidth=5 in B4A (upper than 1)
            addPoint(new TimedPoint(eventX+1, eventY));

netsistemas · May 18, 2020

I inclued:

B4X:

    @Override
    public boolean onTouchEvent(MotionEvent event){
        
        //mayo 2020
 if (this.mStrokeWidth > 1 )
 {

you, now set StokeWith to cero, for to enabled false the touch pad.

B4A Library SignPad V0.20 - Signature Capture - incl Java source

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