Anonymous user
Bitmap/Bézier curves/Cubic: Difference between revisions
→{{header|Lua}}: added Lua solution
(Using Real Math module) |
(→{{header|Lua}}: added Lua solution) |
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Line 1,015:
}
}</lang>
=={{header|Lua}}==
Starting with the code from [[Bitmap/Bresenham's line algorithm#Lua|Bitmap/Bresenham's line algorithm]], then extending:
<lang lua>Bitmap.cubicbezier = function(self, x1, y1, x2, y2, x3, y3, x4, y4, nseg)
nseg = nseg or 10
local prevx, prevy, currx, curry
for i = 0, nseg do
local t = i / nseg
local a, b, c, d = (1-t)^3, 3*t*(1-t)^2, 3*t^2*(1-t), t^3
prevx, prevy = currx, curry
currx = math.floor(a * x1 + b * x2 + c * x3 + d * x4 + 0.5)
curry = math.floor(a * y1 + b * y2 + c * y3 + d * y4 + 0.5)
if i > 0 then
self:line(prevx, prevy, currx, curry)
end
end
end
local bitmap = Bitmap(61,21)
bitmap:clear()
bitmap:cubicbezier( 1,1, 15,41, 45,-20, 59,19 )
bitmap:render({[0x000000]='.', [0xFFFFFFFF]='X'})</lang>
{{out}}
<pre>.............................................................
.X...........................................................
.X...........................................................
..X..........................................................
...X.........................................................
...X.....................................XXXXX...............
....X.................................XXX.....XXXX...........
....X..............................XXX............X..........
.....X...........................XX................X.........
.....X.........................XX...................X........
......X.....................XXX......................XX......
.......X..................XX..........................X......
........X...............XX.............................X.....
.........X...........XXX................................X....
..........XXXX....XXX...................................X....
..............XXXX.......................................X...
.........................................................X...
..........................................................X..
..........................................................X..
...........................................................X.
.............................................................</pre>
=={{header|Lambdatalk}}==
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