mrcharles
10e930e46d
Go CLI that turns the markdown currency of this stack (Redmine notes, Discourse posts, briefing output) into typeset PDFs: two embedded typst templates (report with title page/TOC/headers, dense brief), front-matter (title/subtitle/author/date/classification/template), GFM tables, and bar charts rendered in pure Go (go-chart) from fenced chart data blocks. Engine is a prebuilt typst 0.15.1 container pinned by digest and run --network none; PDF bytes to stdout or -o. Exit codes 0/1/2. All dev in docker (dev.sh/Makefile); unit tests + golden typst fixtures plus a host-side smoke against the real engine container. Generated with Crush Assisted-by: Crush:glm-5.2
49 lines
810 B
Go
49 lines
810 B
Go
package drawing
|
|
|
|
import (
|
|
"image/color"
|
|
"image/draw"
|
|
)
|
|
|
|
// PolylineBresenham draws a polyline to an image
|
|
func PolylineBresenham(img draw.Image, c color.Color, s ...float64) {
|
|
for i := 2; i < len(s); i += 2 {
|
|
Bresenham(img, c, int(s[i-2]+0.5), int(s[i-1]+0.5), int(s[i]+0.5), int(s[i+1]+0.5))
|
|
}
|
|
}
|
|
|
|
// Bresenham draws a line between (x0, y0) and (x1, y1)
|
|
func Bresenham(img draw.Image, color color.Color, x0, y0, x1, y1 int) {
|
|
dx := abs(x1 - x0)
|
|
dy := abs(y1 - y0)
|
|
var sx, sy int
|
|
if x0 < x1 {
|
|
sx = 1
|
|
} else {
|
|
sx = -1
|
|
}
|
|
if y0 < y1 {
|
|
sy = 1
|
|
} else {
|
|
sy = -1
|
|
}
|
|
err := dx - dy
|
|
|
|
var e2 int
|
|
for {
|
|
img.Set(x0, y0, color)
|
|
if x0 == x1 && y0 == y1 {
|
|
return
|
|
}
|
|
e2 = 2 * err
|
|
if e2 > -dy {
|
|
err = err - dy
|
|
x0 = x0 + sx
|
|
}
|
|
if e2 < dx {
|
|
err = err + dx
|
|
y0 = y0 + sy
|
|
}
|
|
}
|
|
}
|