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GetDrawingCount As Long Get the drawing counter. NOTE: GetDrawingCount, ClearDrawingCount, Invalidate, AutoInvalidate and any getter command will be excluded from count. ClearDrawingCount As Clear the drawing counter. Cls As Clear the full canvas with the black color. This is a short hand to cle

Waited long time to figure out how to erase objects drawn on table Here is some simple efficient way to clear the canvas How did I do it ? -save the picture copy when the user starts new project -clippath with canvas.clippath to a rectangle boundary -draw the saved copy of original to the current
link: NEW !!!! Erase the drawing with a defined boundary rectangle done by clip path to a rectangle and draw a project clone bitmap over the curent proeject
link: I did not knew what it can be done with canvas Here is the new function I bring to the app : SNAP to points SNAP accuracy dip units grid space dip un
link: ORTHO FUNCTION AND SNAP ... the beauty of canvas over b4a video on first post

The coordinates are transformed by the current transform as they are added to the path. arcTo (x1 As Double, y1 As Double, x2 As Double, y2 As Double, Radius As Double) As String Adds an arc to the next point (x2, y2) in the current path x1, y1 coordinates of point 1 x2, y2 coordinates of point 2

(targetWidth - 5)/2); Bitmap targetBitmap = Bitmap.createBitmap(targetWidth, targetHeight, Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(targetBitmap); Path path = new Path(); path.addCircle(((float) targetWidth - 1) / 2, ((float) targetHeight -

It has nothing to do with invalidation. It is possible that DrawPath is slow as it requires clipping the canvas. DrawPolygon is not the same as DrawPath. B4XCanvas and Canvas have the exact same performance characteristics.
link: Regarding the posted slowdown... The culprit seems to be drawpath that updates the canvas/image at every usage. @Erel, can you confirm (by looking
link: It is not related to DrawPath. JavaFX Canvas object "auto invalidates". There is no invalidate method in jFX. B4XCanvas.Invalidate doesn't do anything
link: Anyway BitmapCreator on B4J is much faster then Canvas, the procedures of DrawPath that I put in code snippet (here) ere very fast. I'll probably make

Left = innerView.Left + x - downx innerView.Top = innerView.Top + y - downy TouchPanelOverBubble.Left = innerView.Left TouchPanelOverBubble.Top = innerView.Top BubbleMoved End If Return True End Sub private Sub BubbleMoved cvs.ClearRect(cvs.TargetRect)
link: Use the attached modified class.

If you want to keep the image horizontal, then you don't want to rotate the imageview, but its borders. A way to do it would be to use canvas to draw the desired bitmap into an imageview using clippath to define these "custom" borders For instance, IV.Initialize("IV") IV.Gravity=Gravity.F

Hi! I'm having a question about ImageView, Canvas and DrawPath(). I want to draw multiple lines with DrawPath with this Code (see also attachment for a demo): Dim canvas1 As Canvas canvas1.Initialize(ImageView1) Dim PolygonPath As Path PolygonPath.Initialize (64,154) PolygonPath.LineTo (113,234)
link: Hi Klaus, thanks a lot. Great demo!!! Polygon: you are right, it is a polyline (-> copy&paste-error). Ok, it's good to know about the B4A-canvas-li
link: What exactly do you want to achieve? Clipping is used if you want to limit the surface of the drawing. Your PolygonPath is not a polygon, its a polyl

Sub DrawBitmap(canvas1 As Canvas, Bitmap1 As Bitmap, SrcRect As Rect, DestRect As Rect) If SrcRect = Null Then Dim SrcRect As Rect SrcRect.Initialize(0, 0, Bitmap1.Width, Bitmap1.Height) End If Dim p1 As Path p1.InitializeRect(DestRect, 0) canvas1.ClipPath(p1)

Thanks for your quick reply, Erel. No, the error does not crash the app right away, but once the error has occurred all subsequent calls to Canvas.Shapshot throw the same error, as described in the JDK Bug Report: “After this moment, every GUI rendering causes a NullPointerException (triggered by
link: To follow up on https://www.b4x.-resuts-calculating-3d-land-surface-area.135059/ Sorry I have been away longer than expected. Regarding your questi
link: It crashes the app, right? Unless you are able to find what triggers this error, your best option is to catch it: https://www.b4x.-exceptions.77506/#

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