Polygone bug or not convex?

Monkey Targets Forums/Android/Polygone bug or not convex?

Midimaster

(Posted 2014) [#1]

I try to draw a arrow made of 7 points. On HTML5 the result is as expected.
On Android I get a completely wrong painted object:

Strict
Import mojo

Class Game Extends App
	Method OnCreate%()
		SetUpdateRate 10
		Return 0
	End	

	Method OnUpdate%()
		If KeyHit(KEY_ESCAPE) OnBack()
		Return 0
	End	

	Method OnRender%()
		Cls 255,255,255
		DrawArrow
		Return 0
	End	
	
	Method OnBack%()
		EndApp()
		Return 0
	End	

	Method DrawArrow:Void()
		SetColor 255,0,0
		Local vert#[14]
		Local lang%=300
		vert[0]=-20
		vert[1]=0
		
		vert[2]=20
		vert[3]=0
		
		vert[4]=20
		vert[5]=lang

		vert[6]=70
		vert[7]=lang

		vert[8]=0
		vert[9]=lang+100

		vert[10]=-70
		vert[11]=lang
 
 		vert[12]=-20
		vert[13]=lang
		PushMatrix
			Translate 200,50
			DrawPoly vert
		PopMatrix
	End
	
	
	End

Function Main%()
	New Game
	Return 0
End

Is this a bug? Or is this polygone already too complex, because it has inner angles >180°?