Android Question Drawing filled tringles

derez

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• Dec 10, 2013

• #2

Maybe a predrawn bitmap of a triangle stretched according to need ?

 

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stevel05

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• Dec 10, 2013

• #3

Or use DrawPath

 

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dexMilano

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• Dec 10, 2013

• #4

After a brief study I think DrawPath could be the solution.
I will give it a try.
Thanks stevel05
stay tuned

dex

 

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Erel

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• Dec 11, 2013

• #5

B4X:

Sub Activity_Create(FirstTime As Boolean)
   Dim c As Canvas
   c.Initialize(Activity)
   Dim p As Path
   p.Initialize(100dip, 100dip)
   p.LineTo(150dip, 200dip)
   p.LineTo(200dip, 100dip)
   c.ClipPath(p)
   c.DrawColor(Colors.Red)
   c.RemoveClip
End Sub

 

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klaus

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• Dec 11, 2013

• #6

Hi Erel,
Is there an advantage to use this code

B4X:

c.ClipPath(p)
c.DrawColor(Colors.Red)
c.RemoveClip

rather than this one ?

B4X:

c.DrawPath(p, Colors.Red, True, 1)

 

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Erel

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• Dec 11, 2013

• #7

No. I forget about this method

Both options are good.

With the ClipPath solution you can also draw images or Drawables.

 

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dexMilano

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• Dec 11, 2013

• #8

Great!
Last "suggestion" if I need to draw this triangle in a bitmap object (placed with Designer)?
Also, if I've to pain a 2nd bitmap (partially transparent) over the triangle (that is inside the 1st bitmap)?

(I've never used dynamic bitmaps before)

 

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klaus

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• Dec 11, 2013

• #9

Last "suggestion" if I need to draw this triangle in a bitmap object (placed with Designer)?

Click to expand...

No problem, set the target of the canvas to the view containing the image.

Also, if I've to paint a 2nd bitmap (partially transparent) over the triangle (that is inside the 1st bitmap)?

Click to expand...

Is your bitmap already partially transparent ?
Or do you want to draw a partially transparent triangle onto the second bitmap.
Attached a small test ptoject that showa bimap with one button allowing to draw a second bitmat in a triangle on the first bitmap and a second button allowing to draw a partially transparent colored triangle.

 

Attachments

• DrawPath.zip

  116 KB · Views: 270

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dexMilano

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• Dec 11, 2013

• #10

Thanks Klaus,
I will check your code.

Exactly I need to
Create an an empty bitmap (trasparent)
Draw the triangle on the bitmap
Draw the 2nd transparent bitmap (the grid) over the triangle
show the bitmap

dex

 

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Informatix

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• Dec 12, 2013

• #11

Forget the canvas and start using my Accelerated Canvas library. You will get more possibilities, anti-aliased lines and a faster drawing.

 

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dexMilano

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• Dec 13, 2013

• #12

thanks Informatix.
I'm thinking something else (not techical but UX review).
I will keep it in mind

dex

 

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