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add canvas lines test

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MihailRis 2026-07-18 13:27:27 +03:00
parent 586ab39483
commit 917806a7ef
2 changed files with 51 additions and 0 deletions
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dev/tests/canvas_lines.lua Normal file
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local W, H = 128, 128
local canvas = Canvas({W, H})
canvas:clear(0xff202020)
local WHITE = 0xffffffff
local RED = 0xffff4040
local GREEN = 0xff40ff40
local BLUE = 0xff4080ff
local YELLOW = 0xffffff40
-- border
canvas:line(0, 0, W - 1, 0, WHITE)
canvas:line(W - 1, 0, W - 1, H - 1, WHITE)
canvas:line(W - 1, H - 1, 0, H - 1, WHITE)
canvas:line(0, H - 1, 0, 0, WHITE)
-- horizontal
canvas:line(-40, 16, W + 40, 16, RED)
canvas:line(-40, H / 2, W + 40, H / 2, RED)
canvas:line(-40, H - 17, W + 40, H - 17, RED)
-- vertical
canvas:line(16, -40, 16, H + 40, GREEN)
canvas:line(W / 2, -40, W / 2, H + 40, GREEN)
canvas:line(W - 17, -40, W - 17, H + 40, GREEN)
-- diagonals
canvas:line(-40, -40, W + 40, H + 40, BLUE)
canvas:line(-40, H + 40, W + 40, -40, BLUE)
canvas:line(W / 2, -40, W + 40, H / 2, BLUE)
canvas:line(-40, H / 2, W / 2, H + 40, BLUE)
-- outer
canvas:line(-30, -30, 20, 20, YELLOW)
canvas:line(W - 20, H - 20, W + 30, H + 30, YELLOW)
canvas:line(W + 30, -30, W - 20, 20, YELLOW)
canvas:line(-30, H + 30, 20, H - 20, YELLOW)
-- completely outside
canvas:line(-50, -20, -10, H + 20, 0xffff00ff)
canvas:line(W + 10, -20, W + 50, H + 20, 0xffff00ff)
canvas:line(-20, -20, W + 20, -10, 0xffff00ff)
canvas:line(-20, H + 10, W + 20, H + 30, 0xffff00ff)
local expected = Canvas.decode(
file.read_bytes("script:attachments/line_clipping_test.png"), "png"
)
asserts.equals(expected, canvas)