Created
October 3, 2017 13:00
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Draw a circle using Bresenham’s algorithm
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| r = 10; | |
| it[{x_, y_}] := | |
| If[2 (r^2 - x^2 - y^2) - 4 x + 2 y - 3 > 0, {x + 1, y}, {x + 1, | |
| y - 1}]; | |
| oct = NestWhileList[it, {0, r}, #[[1]] <= #[[2]] &][[1 ;; -2]]; | |
| showMatPlot[points_List] := | |
| MatrixPlot@SparseArray[# + {r + 1, r + 1} -> 1 & /@ points] | |
| showMatPlot[ | |
| Join[oct, # /. {{x_, y_} -> {y, x}} & /@ | |
| oct, # /. {{x_, y_} -> {x, -y}} & /@ | |
| oct, # /. {{x_, y_} -> {-y, x}} & /@ oct, | |
| -oct, -# /. {{x_, y_} -> {y, x}} & /@ | |
| oct, # /. {{x_, y_} -> {-x, y}} & /@ | |
| oct, # /. {{x_, y_} -> {y, -x}} & /@ oct]] |
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