Draw an Ellipse

[alfcen]

Perhaps I am getting senile, couldn't find anything like Canvas1.DrawEllipse().
Surely, under penalty of speed, it is possible to draw an ellipse or an arc by means of plotting points...

 

[agraham]

An Android Canvas does have a DrawOval method which Erel seems to have overlooked implementing.

@Erel - Maybe in the next release?

 

[alfcen]

Thank you, Andrew, also for confirming that I'm not (yet) senile :sign0095:

 

[Erel]

@Erel - Maybe in the next release?

I will check it.

 

[derez]

Until then... I use this workarround:

load an empty bitmap (transparent) to a square imageview, draw a circle on this imageview and then copy the bitmap using drawbitmap from the square source to the rectangular destination. The circle is stretched to an ellipse.

Dim cn As Canvas
   Dim bmp As Bitmap
   Dim src, dst As Rect
   bmp.Initialize(File.DirAssets,"empty.png")
   emptyview.SetBackgroundImage(bmp)
   cn.Initialize(emptyview)
   cn.DrawCircle(emptyview.Width/2,emptyview.Height/2,emptyview.Width/2,selectedcolor,True,1)
   src.Initialize(0,0,emptyview.Width,emptyview.Height)
   dst.Initialize(circlepnl.Left,circlepnl.Top,circlepnl.Left+circlepnl.Width,circlepnl.Top + circlepnl.Height)
   
   cnvs.DrawBitmap(emptyview.Bitmap,src,dst)
   board.Invalidate2(dst)

 

[alfcen]

Not bad. The idea was about an inclined ellipse such as an eccentric planet orbit

 

[Marc DANIEL]

Perhaps I am getting senile, couldn't find anything like Canvas1.DrawEllipse().
Surely, under penalty of speed, it is possible to draw an ellipse or an arc by means of plotting points...

10 years later, it's still as difficult to draw an ellipse!​

 

[DonManfred]

10 years later, it's still as difficult to draw an ellipse!

Posting to an 10 years old thread is always a mistake.

 

[Marc DANIEL]

Yes Manfred, I don't publish here but there ...
Regards Marc