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6A45: Calculate offset right edge position
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For offset islands (state_island_byte_3=2). Right edge = $3C + left. This creates an asymmetric island where right edge follows left edge with fixed river width.
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| calc_offset_edge | 6A45 | LD A,C | A = C + D = 60 + left_x, then jump to draw_right_edge. | |
| 6A46 | ADD A,D | |||
| 6A47 | JP draw_right_edge | |||
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