From 917806a7ef8f67dee14a6a258ab3e9ae357a89d3 Mon Sep 17 00:00:00 2001
From: MihailRis <mexaruc@gmail.com>
Date: Sat, 18 Jul 2026 13:27:27 +0300
Subject: [PATCH] add canvas lines test

---
 dev/tests/attachments/line_clipping_test.png | Bin 0 -> 1523 bytes
 dev/tests/canvas_lines.lua                   |  51 +++++++++++++++++++
 2 files changed, 51 insertions(+)
 create mode 100644 dev/tests/attachments/line_clipping_test.png
 create mode 100644 dev/tests/canvas_lines.lua

diff --git a/dev/tests/attachments/line_clipping_test.png b/dev/tests/attachments/line_clipping_test.png
new file mode 100644
index 0000000000000000000000000000000000000000..bb20d18415b55895486fc5ec65ebfcb54c2d6b6f
GIT binary patch
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diff --git a/dev/tests/canvas_lines.lua b/dev/tests/canvas_lines.lua
new file mode 100644
index 000000000..c7ef68520
--- /dev/null
+++ b/dev/tests/canvas_lines.lua
@@ -0,0 +1,51 @@
+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)