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Now you can paint on the canvas as you like. Here it is a random graphics: Sub DrawGraph Dim Random, High, Low As Int Canvas.DrawRect(0,0,1000,200,fx.colors.black,True, 0 ) For i=0 To 800 Step 2 Random =Rnd(-50,50) If Random<0 Then High=100+Random
link: 2000) InnerPane = ScrollPane1.InnerNode InnerPane.RemoveAllNodes If Not(cv.IsInitialized) Then cv.Initialize("Canvas") InnerPane.AddNo
link: It is possible to add Nodes in a ScrollPane with the trick below: Load an empty layout, this converts the ScrollPane.InnerPane to a Pane. Define a Pan
link: Is it possible to dynamically remove/add canvas to the scrollview if we can't adjust the size on runtime? considering if we want to plot audio waves w

Once again I found myself writing code to draw arrows on canvas. @klaus has provided a basic technique that I also use: define the set of points on the arrow as a path and then draw the path. https://www.b4x.-broken-line-arrow-head.43450/post-264259 I finally decided to write a more general class t
link: The code to generate the above screenshot. Private Sub B4XPage_Created (Root1 As B4XView) Root = Root1 'in Globals Private arrow As arrows
link: Why dont you try and create a flowchart making app? That will be really awesome...

Using a B4XCanvas you have the B4XPath.InitializeOval(Rect As B4XRect) method. And use B4XCanvas.DrawPath method. Be aware that DrawPath works differently than DrawRectangle and DrawCircle when the Filled property is False. With DrawRectangle and DrawCircle, the Stroke is half on both sides if the
link: I see that among the methods available for a Canvas there is only the DrawCircle The question is: how to draw an ellipse?

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 canva
link: Are you calling cnv.ClearRect(...) each time before the DrawText ? eg Sub DrawIt(s As String) cnv.ClearRect(0,0,cnv.Width ,cnv.Height) cnv.D
link: Not something I thought about, but you're absolutely right, that'll be the solution! Thanks Klaus. Sub Process_Globals Dim cnv As B4XCanvas
link: Oh the ClearRect() does work, turns out I didn't do 0,0 for coordinates. However new problem. I need to be able to physically stretch this text sidewa

Rotates the text before it is drawn. Invalidate As Commits the drawings. If AutoInvalidate is False (default) this must be called for the drawings to be updated. MeasureText (Text As String, Font As B4XFont) As B4XRect Measures single line texts and returns their width, height and the height above

Width As Double, Height As Double, Color As Paint, Filled As Boolean, LineWidth As Double) As String Draws a Rectangle x = left coordinate of the surrounding rectangle Y = top coordinate of the surrounding rectangle Width = width coordinate of the surrounding rectangle Height = height coordinate
link: Sorry for answering only today, but I was very busy the last two days. I suggest you to ask the question in the questions forum, in a new thread, as i
link: Hello Klaus! To find the Centroid of this figure? regards...

MainForm.Show Canvas1.DrawRect(0,0,Canvas1.Width,Canvas1.Height,fx.Colors.White,True,10) 'Canvas2.DrawRect(0,0,Canvas2.Width,Canvas2.Height,fx.Colors.Transparent,True,10) Canvas2.DrawLine(100,100,200,200,fx.Colors.Blue,10) Log(GetType(Canvas2)) End Sub 'Return true to allow the
link: 96041 I am trying to implement a simple line draw using the mouse on a canvas. The below code leaves artifacts on the canvas. I was expecting Canvas1
link: The problem was that you set Alpha Level to 0 in the Designer! This has as a result that nothing id drawn onto the Canvas, it must be 1.0. Then, to m
link: Perhaps I am missing something but I can't explain why two different DrawLine commands with the same parameters render differently. It looks like an i

When I wrote my answer in post #2 I missed the fact that you were talking about Canvas. BitmapCreator.DrawRect should draw thin lines properly.
link: Not the most elegant solution but you can use DrawRect to draw thin lines. DrawRect is not anti-aliased as the lines are always straight. Making Draw
link: As straight lines is a simple edge case I don't want (for now) to modify DrawRect or DrawLine and treat it specially.
link: Now, just my two cents. For me, the pixel values in the drawing methods should be considered as coordinates. This means, without antialiasing that: R

I managed to solve this query by using the function below Sub canvas_arrow(fromx As Double, fromy As Double, tox As Double, toy As Double) Dim headlen As Int = 10 ' length of head in pixels Dim dx As Double = tox - fromx Dim dy As Double = toy - fromy Dim angle As Double = ATan2(dy,
link: Is it possible to draw an arrow on a canvas (Or CanvasExt), where the arrow will follow and extend as you drag your mouse along the canvas?

Last parameter should be a number: https://www.b4x./?query=Canvas.DrawRect&product=b4j It is the stroke width.
link: Canvas.DrawRect(0, 0, 40, 100, fx.Colors.Red, True, False) send : Could not cast type: {Type = Boolean, Rank = 0, RemoteObject = True} to: number.

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