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Code Issues Releases Wiki Activity

delete center

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Justin Lin
2019-06-21 07:29:29 +08:00
parent 631d0c8506
commit 3aa5d552c0
1 changed files with 24 additions and 28 deletions
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52
src/pixel/px_circle.scad
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@@ -2,10 +2,8 @@ function _px_circle_y(f, y) = f >= 0 ? y - 1 : y;
function _px_circle_ddf_y(f, ddf_y) = f >= 0 ? ddf_y + 2 : ddf_y; function _px_circle_ddf_y(f, ddf_y) = f >= 0 ? ddf_y + 2 : ddf_y;
function _px_circle_f(f, ddf_y) = f >= 0 ? f + ddf_y : f; function _px_circle_f(f, ddf_y) = f >= 0 ? f + ddf_y : f;
function _px_circle_sub(center, f, ddf_x, ddf_y, x, y, filled) = function _px_circle_sub(f, ddf_x, ddf_y, x, y, filled) =
let( let(
x0 = center[0],
y0 = center[1],
ny = _px_circle_y(f, y), ny = _px_circle_y(f, y),
nddf_y = _px_circle_ddf_y(f, ddf_y), nddf_y = _px_circle_ddf_y(f, ddf_y),
nx = x + 1, nx = x + 1,
@@ -15,34 +13,32 @@ function _px_circle_sub(center, f, ddf_x, ddf_y, x, y, filled) =
concat( concat(
filled ? filled ?
concat( concat(
[for(xi = -nx; xi <= nx; xi = xi + 1) [x0 - xi, y0 + ny]], [for(xi = -nx; xi <= nx; xi = xi + 1) [-xi, ny]],
[for(xi = -ny; xi <= ny; xi = xi + 1) [x0 - xi, y0 + nx]], [for(xi = -ny; xi <= ny; xi = xi + 1) [-xi, nx]],
[for(xi = -ny; xi <= ny; xi = xi + 1) [x0 - xi, y0 - nx]], [for(xi = -ny; xi <= ny; xi = xi + 1) [-xi, -nx]],
[for(xi = -nx; xi <= nx; xi = xi + 1) [x0 - xi, y0 - ny]] [for(xi = -nx; xi <= nx; xi = xi + 1) [-xi, -ny]]
) )
: :
[ [
[x0 - nx, y0 + ny], [-nx, ny],
[x0 + nx, y0 + ny], [nx, ny],
[x0 - ny, y0 + nx], [-ny, nx],
[x0 + ny, y0 + nx], [ny, nx],
[x0 - ny, y0 - nx], [-ny, -nx],
[x0 + ny, y0 - nx], [ny, -nx],
[x0 - nx, y0 - ny], [-nx, -ny],
[x0 + nx, y0 - ny] [nx, -ny]
], ],
_px_circle(center, nf, nddf_x, nddf_y, nx, ny, filled) _px_circle(nf, nddf_x, nddf_y, nx, ny, filled)
); );
function _px_circle(center, f, ddf_x, ddf_y, x, y, filled) = function _px_circle(, f, ddf_x, ddf_y, x, y, filled) =
x >= y ? [] : _px_circle_sub(center, f, ddf_x, ddf_y, x, y, filled); x >= y ? [] : _px_circle_sub(f, ddf_x, ddf_y, x, y, filled);
function px_circle(radius, center = [0, 0], filled = true) = function px_circle(radius, filled = true) =
let( let(
x0 = center[0],
y0 = center[1],
f = 1 - radius, f = 1 - radius,
ddf_x = 1, ddf_x = 1,
ddf_y = -2 * radius, ddf_y = -2 * radius,
@@ -52,15 +48,15 @@ function px_circle(radius, center = [0, 0], filled = true) =
concat( concat(
filled ? filled ?
concat( concat(
[[x0, y0 + radius], [x0, y0 - radius]], [[0, radius], [0, -radius]],
[for(xi = -radius; xi <= radius; xi = xi + 1) [x0 + xi, y0]] [for(xi = -radius; xi <= radius; xi = xi + 1) [xi, 0]]
) )
: :
[ [
[x0, y0 + radius], [0, radius],
[x0, y0 - radius], [0, -radius],
[x0 + radius, y0], [radius, 0],
[x0 -radius, y0] [-radius, 0]
], ],
_px_circle(center, f, ddf_x, ddf_y, x, y, filled) _px_circle(f, ddf_x, ddf_y, x, y, filled)
); );