canvas

I want to extract the image in a bitmap using a webview and javascript commands. The code on the web page looks like that: <canvas class="mypic" id="mpcanvas0" width="1024" height="100" >test</canvas> The image is dynamically changed. If I try: Dim js As String js = $"B4A.CallSub('pic_cb'...

Drawing progressbar at the bottom of a label. After that I need to clear this progressbar: Dim i As Int Dim cvs1 As B4XCanvas For i = 1 to 100 cvs1.DrawLine(0, lbl.Height - 1, lbl.Width * i/100, lbl.Height - 1, Colors.Red, 1dip) cvs1.Invalidate Next 'then after a while (user will press a...

Hello, I don't know what is this view's name? :/ excuse me! But I want to know if we can make it with B4Xcanvas & how to make it Excuse me for my bad English :) Thanks

Hello All, I need to grab a pre existing image, generate a qrcode as a second image, set up a canvas, set them side by side and save the canvas as a single image. What am I doing wrong since I always get an empty image in the right area. I have tried to set both as the first existing image and...

Remake of some eyecandy generative art that I am interesetd from openprocessing to B4A. Tried additional libs to reinforce canvas drawing: ABExtDrawing: very nice complete graphics lib AcceleratedSurface: amazing hw accelerated lib with lots of demos to learn Will try BitmapCreator for image...

When using Canvas methods Snapshot or Snapshot2 to convert the contents of a Canvas to an Image, it throws the following exception when the size of the Canvas is too large. Does anyone know how I can determine what is the maximum WIDTH * HEIGHT, and how this upper limit can be changed? Thanks...

I'm at a loss here. I need to dynamically draw text with Canvas.DrawText, and while it works the first time around, when the text is changed it overlaps. I've tried: Canvas.ClearRect() Canvas.DrawRect() - with fx.Colors.Transparent Setting views invisible and visible again Adding and removing...

Ola Download Using the BANanoElement & BANanoObject, one is able to script the HTML canvas to draw images etc. Here we follow the same methodology used to create canvas structures. To be able to do this, one uses the BANanoElement to create the <CANVAS> tab, then from that gets the 2d context...

EDIT: see posts #2 and #4 for better solutions thanks to Erel. There might be better ways but I have used DrawRect() method of the Canvas in the past when I want to do free mouse/hand drawing on the screen. However, very often DrawRect() skips some points, i.e., leaves gaps if one tries to draw...

Hi all i have seen on code from Erel where following code is executed on B4J side to draw on a canvas Sub cvs_MouseDragged (EventData As MouseEvent) cvs.DrawCircle(EventData.X, EventData.Y, 30dip, fx.Colors.From32Bit(Rnd(0xFF000000, -1)), True, 0) End Sub Here as we see that MouseDragged...

Hi, is there a way to clip / crop with bitmapcreator ? Similar to canvas.ClipPath / canvas.RemoveClip. I would like to try using BitmapCreator instead of B4XCanvas, I'm trying to maximize performance gains.

I tried to search, but could not find any example to do what I want. I want to select a picture in the device, and load it into a canvas How should I proceed ? TIA :)

If there a "conflict" between 9Patch and canvas MeasureStringWidth or, as always :D, I'm doing something wrong? If I use canvas MeasureStringWidth after applying the 9 patch I get a strange result (see the attached project, please).

Hello, i have a question about the canvas.drawtext function for this code: Private Sub CreateBitmap (lbl As B4XView) As B4XBitmap Dim p As B4XView = xui.CreatePanel("") p.SetLayoutAnimated(0, 0, 0, DigitWidth, DigitHeight * 10) Dim cvs As B4XCanvas cvs.Initialize(p) Dim...

Ullu: Meme Generator, Make Hindi Memes Easily https://play.google.com/store/apps/details?id=com.multiverse.memegenerator.indian With Meme Generator, you can create the funniest memes and share them with your friends via Facebook, Twitter, Instagram, WhatsApp, Messenger, Google+, E-mail...

Hey, how can i draw that on a Panel? I fail at the rounded one. Greetings :)

Hello, is this prossible with a panel? Greetings :)

Hi, I have seen examples in the forum of taking screen shots of panels and saving them to a canvas and bitmap image. My trouble is I am trying to draw views to a PDF canvas (or any canvas) programmatically with no views displayed on a layout at the time. I was able to solve this in B4i using...

Hello, How can i save the state of my Canvas drawing for the Undo and Redo Button with the UndoManager? i use this code for drawing: Process_Globals Private pnl_back As B4XView Private cvs_back As B4XCanvas End Sub Sub AppStart (Form1 As Form, Args() As String)...

Hello my friend, How can i set antialias at b4x canvas? Dim Obj1 As Reflector Dim Canv As Canvas Canv.Initialize(Btn1) ' initialize on what you want Obj1.Target = Canv Obj1.Target = Obj1.GetField("paint") Obj1.RunMethod2("setAntiAlias", True, "java.lang.boolean") This...