Procedural animated texture generation/Compasses

This page describes content that has been removed and was only present in earlier versions of Minecraft.

Procedurally generated textures such as this one were removed and replaced by pre-rendered animations in Java Edition 1.5 and Xbox 360 Edition TU12.

Compasses simply draw two lines over the item sprite to form the needle.

Much like clocks, the code responsible for moving the needle is also present with the "setup" code, however it is omitted here as it is not pertinent to the actual drawing of the sprite. Also like clocks, an oversight in how the compass sprite is set to be loaded prevents texture packs from overriding the compass's base sprite.

The base sprite for the compass

def setup_compass_sprite (item: Image, angle: float, output: Image):
	NX      = 8.5
	NY      = 7.5
	SCALE_X = 0.3
	SCALE_Y = SCALE_X * 0.5
	
	# copy the item's texture into the output
	for i, pix in enumerate(item):
		output.set_pixeli(i, pix)
	
	rx = sin(angle)
	ry = cos(angle)
	
	# draw the smaller horizontal spurs of the needle
	# 1 is added to the endpoint, as `range` here is
	# end-exclusive. The original loops did `i <= 4`
	for i in range(-4, 4 + 1):
		x = int(NX + ry * i * SCALE_X)
		y = int(NY - rx * i * SCALE_Y)
		output.set_pixel(x, y, '#646464')
	
	# draw the main part needle
	for i in range(-8, 16 + 1):
		x = int(NX + rx * i * SCALE_X)
		y = int(NY + ry * i * SCALE_Y)
		if i >= 0:
			# Main red pointer
			output.set_pixel(x, y, '#FF1414')
		else:
			# Grey back half
			output.set_pixel(x, y, '#646464')

The generated compass sprite has 102 possible unique frames, while the pre-rendered compass has significantly less, at only 32 frames.

Procedurally generated
Prerendered frames
Visualization of all of the points that are plotted in drawing the needle