Unwanted black lines scene_drawing

[DarthXander]

I'm using the scene module to draw several rectangles on the screen and then using triangle_strip() to draw triangles on top of them. Two of the rectangles in my scene have black lines along the left of them, even though neither my fill nor stroke colors are black.

Here's my code within the draw(self) method:

    def draw(self):
        background(.3, .66, .9)
		stroke_weight(0)
		density = 50
		for i in range(density):
			fill(i/float(density), 0, 1)
			start = i/float(density)
			end = (i+.8)/float(density)
			smaller = min(self.terrain_func(start), self.terrain_func(end))
			rect(start*self.bounds.w, 0, (end-start)*game.bounds.w, smaller*self.bounds.h)	
			if self.terrain_func(start) < self.terrain_func(end):
				v = [(start*self.bounds.w, self.terrain_func(start)*self.bounds.h), (end*self.bounds.w, self.bounds.h*self.terrain_func(start)), (end*self.bounds.w, self.bounds.h*self.terrain_func(end))]
			else:
				v = [(start*self.bounds.w, self.terrain_func(end)*self.bounds.h), (end*self.bounds.w, self.bounds.h*self.terrain_func(end)), (start*self.bounds.w, self.bounds.h*self.terrain_func(start))]
			triangle_strip(v)

Anyone know what's going on?

Oh, and here's an imgur link to screenshots of what's happening.

[DarthXander]

Well, I never figured out how to fix it, but i just replaced the call to rect() with triangle_strip() with the vertices for two triangles to draw a rectangle that way.

[FarmerPaco]

Do you mind posting the final script with the changes. I would love to see how it turned out.
Thanks in advance.
farmerPaco