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6A3F: Calculate mirrored right edge position
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For symmetric islands (state_island_byte_3=1). Right edge = 2*$3C - left = 120 - left. This mirrors the left edge around screen center, creating a symmetric island shape.
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| calc_mirrored_edge | 6A3F | LD A,C | A = 2*C - D = 120 - left_x, then jump to draw_right_edge. | |
| 6A40 | SUB D | |||
| 6A41 | ADD A,C | |||
| 6A42 | JP draw_right_edge | |||
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