openscad/dotSCAD
1
0
Fork 0
mirror of https://github.com/JustinSDK/dotSCAD.git synced 2025-04-20 06:02:05 +02:00
Code Issues Releases Wiki Activity

add px_gray

Browse Source
This commit is contained in:
Justin Lin 2019-08-25 15:44:14 +08:00
parent b72ae73c2e
commit 1af801f54a
1 changed files with 36 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
src/pixel/px_gray.scad Normal file
View File

@ -0,0 +1,36 @@
function _px_gray_row(r_count, row_bits, width, height, center, invert) =
let(
half_w = width / 2,
half_h = height / 2,
offset_x = center ? 0 : half_w,
offset_y = center ? 0 : half_h,
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,
invert ? row_bits[i] / 255 : 1 - row_bits[i] / 255
]
];
function px_gray(levels, size, 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]]
],
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))
if(row != []) each row
];