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https://github.com/a2-4am/4cade.git
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58 lines
1.9 KiB
Python
58 lines
1.9 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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# - on every 3rd row
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# - on even columns
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# are included.
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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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# divided by 3.
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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 2x3 block. The bitmask usually includes 2 adjacent pixels;
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# the code will also plot the same 2 adjacent pixels in the next two rows.
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#
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# Unfortunately, since bytes are 7 pixels across, some of the 2-pixel-wide
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# blocks will cross a byte boundary. To simplify the 6502 code, these are
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# simply listed as separate coordinate pairs, each with a bitmask that
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# includes 1 pixel instead of 2.
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max_x = 280
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max_y = 192
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def f(theta, k):
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r = k*(5+2*cos(5*theta))
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return r*cos(theta),r*sin(theta)
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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)/100.0)
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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 % 3 != 0):
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continue
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if x < 0 or x >= max_x 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_3bit(unique_coords)
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with open("../../../src/fx/fx.hgr.flower.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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ripple_vals = util.ripple(unique_vals)
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with open("../../../src/fx/fx.hgr.flower.ripple.data.a", "w") as f:
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for aval, bval in ripple_vals:
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f.write(" !byte %s,%s\n" % (aval, bval))
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unique_vals.reverse()
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with open("../../../src/fx/fx.hgr.flower.in.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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