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change levels format

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This commit is contained in:
Justin Lin 2019-08-25 19:50:17 +08:00
parent 00f1b3a63d
commit 108450b029
1 changed files with 7 additions and 15 deletions
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22
src/pixel/px_gray.scad
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@ -3,34 +3,26 @@ function _px_gray_row(r_count, row_bits, width, height, center, invert) =
half_w = width / 2,
half_h = height / 2,
offset_x = center ? 0 : half_w,
offset_y = center ? 0 : half_h,
offset_y = center ? -half_h : 0,
level = invert ? 0 : 255
)
[
for(i = 0; i < width; i = i + 1)
if(row_bits[i] != level)
[
i - half_w + offset_x,
r_count + offset_y,
[i - half_w + offset_x, r_count + offset_y],
invert ? row_bits[i] / 255 : 1 - row_bits[i] / 255
]
];
function px_gray(levels, size, center = false, invert = false) =
function px_gray(levels, center = false, invert = false) =
let(
squar = sqrt(len(levels)),
siz = is_undef(size) ? [squar, squar] : size,
width = siz[0],
height = siz[1],
rows = [
for(row = height - 1; row > -1; row = row - 1)
[for(column = 0; column < width; column = column + 1)
levels[row * width + column]]
],
width = len(levels[0]),
height = len(levels),
offset_i = height / 2
)
[
for(i = 0; i < height; i = i + 1)
let(row = _px_gray_row(i - offset_i, rows[i], width, height, center, invert))
for(i = height - 1; i > -1; i = i - 1)
let(row = _px_gray_row(height - i - 1, levels[i], width, height, center, invert))
if(row != []) each row
];