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https://github.com/a2-4am/4cade.git
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52 lines
1.8 KiB
Python
52 lines
1.8 KiB
Python
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#!/usr/bin/env python3
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from math import sqrt, sin, cos, acos, pi
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import util
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# Graph is plotted across the entire HGR screen, but only coordinates
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# - in the left half of the screen, AND
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# - on even rows, AND
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# - on even columns
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# are included. It is assumed that the graph is symmetrical across
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# the left and half sides of the screen (along an axis at X=140).
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#
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# X coordinates are converted to byte+bitmask (but see notes below).
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# Y coordinates are flipped (so 0,0 ends up on the bottom left) then
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# incremented by 1 so that 0 can terminate the loop,
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#
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# 6502 code will be responsible for plotting each of these coordinates
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# in a 2x2 block. The bitmask usually includes 2 adjacent pixels;
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# the code will also plot the same 2 adjacent pixels in the adjacent row,
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# AND mirror both of those plots in the right half of the screen.
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#
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# Unfortunately, since bytes are 7 bits across, some blocks will cross a
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# byte boundary. To simplify the 6502 code, those are simply listed as
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# separate coordinate pairs, each with a bitmask that includes 1 pixel
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# instead of 2.
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max_x = 280
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max_y = 192
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def f(t, k):
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r = k/cos(0.4*acos(sin(2.5*(t+pi/2))))
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return r*cos(t+pi-(pi*k/50)),r*sin(t+pi-(pi*k/50))
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coords = []
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for k_mul in range(5000):
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for t_mul in range(int(pi*1000+1)):
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a, b = f(float(t_mul/100), float(k_mul)/5.0)
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x = round(max_x//2+a*1.2)
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y = round(max_y//2+b)
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if (x % 2 != 0) or (y % 2 != 0):
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continue
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if x < 0 or x >= max_x//2 or y < 0 or y >= max_y:
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continue
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coords.append((x,y))
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unique_coords = util.unique(coords)
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unique_vals = util.vals_2bit(unique_coords)
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unique_vals.reverse()
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with open("../../../src/fx/fx.hgr.star.bloom.data.a", "w") as f:
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for aval, bval in unique_vals:
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f.write(" !byte %s,%s\n" % (aval, bval))
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