gaps in lines

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BachFire

Hello,

Since I just started, I'm doing something simple. You draw with your mouse pointer (hold down left button). But gaps can appear in the lines once in a while. Why is that happening? Here is the code:

Strict
Local x#=MouseX()
Local y#=MouseY()
Local width#=800
Local height#=800

Graphics width,height,0

While Not KeyDown(Key_Escape)
	DrawText "Right button = Clear screen",0,0
	DrawText "ESC = quit",0,15
	If x And y <> 0
		If MouseDown(1)
			DrawLine(x,y,MouseX(),MouseY())
			Plot MouseX(),MouseY()
		EndIf
		If MouseHit(2) Then Cls
	EndIf
	x=MouseX();y=MouseY()
	Flip
Wend