Drawing an ishihara (color blind test)?

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ragtag

Rck: Thanks for the example. I converted the second one to BlitzMax as I don't have BlitzPlus, and added space to stop it. :-)


Graphics 800,600,0,2
ft = CreateTimer(60)

SeedRnd(MilliSecs())

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

Type ball
	Field x#, y#, r
End Type

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

Global failsInARow = 0
Global maxFails = 50
Global ballList:TList = CreateList()


Repeat

	If failsInARow < maxFails Then
		If addBall() Then
			failsInARow = 0
		Else
			failsInARow = failsInARow + 1
		EndIf
	EndIf
	
	If KeyHit(KEY_SPACE) Then
		failsInARow = 51
		EndIf
	'WaitEvent()
	
	Cls
	DrawBalls()
	Flip(0)

Until KeyHit(KEY_ESCAPE)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

Function addBall()
	
	GW = GraphicsWidth()
	GH = GraphicsHeight()
	newR = Rand(5, 20)
	
	For a = 1 To 1000
		newx = Rand(newR, GW-newR)
		newy = Rand(newR, GH-newR)
		
		isgood = 1
		
		For eb:ball = EachIn ballList
			dx = (eb.x-newx)
			dy = (eb.y-newy)
			If dx*dx + dy*dy < (eb.r + newR)*(eb.r + newR) Then
				isgood = 0
				Exit
			EndIf
		Next
		
		If isgood = 1 Then
			nb:ball = New ball
			nb.x = newx
			nb.y = newy
			nb.r = newR
			ballList.AddLast(nb)
			Exit
		EndIf
	Next
	
	Return isGood
	
End Function

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

Function DrawBalls()
	If failsInARow < maxFails Then
		For eb:ball = EachIn ballList
			DrawRect eb.x-eb.r, eb.y-eb.r, 2*eb.r, 2*eb.r
		Next
		DrawText 0,0,failsInARow
	Else
		For eb:ball = EachIn ballList
			DrawOval eb.x-eb.r, eb.y-eb.r, 2*eb.r, 2*eb.r
		Next
	EndIf
End Function

It's close to what I want, though a bit brute force like my current method. Will look into it further.