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package lines
import (
"fmt"
"image"
"image/color"
"image/draw"
"golang.org/x/image/font"
"golang.org/x/image/font/basicfont"
"golang.org/x/image/math/fixed"
)
const padding = 30
type xAndYAxis struct {
img *image.RGBA
size int
}
func newXAndYAxis(size int) *xAndYAxis {
imageRGBA := image.NewRGBA(image.Rect(0, 0, size+padding, size+padding))
return &xAndYAxis{img: imageRGBA, size: size}
}
func (p *xAndYAxis) drawXandY(s *image.RGBA) *image.RGBA {
draw.Draw(p.img, p.img.Bounds(), &image.Uniform{color.White}, image.Point{}, draw.Src)
r := image.Rectangle{image.Point{padding, 0}, p.img.Rect.Max}
draw.Draw(p.img, r, s, image.Point{0, 0}, draw.Src)
p.vLine(padding-1, 0, s.Bounds().Max.Y)
p.hLine(padding-1, s.Bounds().Max.Y+1, p.img.Bounds().Max.X)
px := int(p.size / sizesimpix)
ds := sizesimpix - 1
for cx := 0; cx < sizesimpix; cx++ {
p.addTextTo(int(padding/3), int(((cx+1)*px)-(px/3)), fmt.Sprintf("%02d", ds))
ds--
}
for cx := 0; cx < sizesimpix; cx++ {
p.addTextTo(int(cx*px+padding+(px/4)), int((p.img.Bounds().Max.Y)-padding/2), fmt.Sprintf("%02d", cx))
}
return p.img
}
func (p *xAndYAxis) hLine(x1, y, x2 int) {
for ; x1 <= x2; x1++ {
p.img.Set(x1, y, color.Gray16{0x0})
}
}
func (p *xAndYAxis) vLine(x, y1, y2 int) {
for ; y1 <= y2; y1++ {
p.img.Set(x, y1, color.Gray16{0x0})
}
}
func (p *xAndYAxis) addTextTo(x, y int, label string) {
d := &font.Drawer{Dst: p.img,
Src: image.NewUniform(color.Gray16{0x0}),
Face: basicfont.Face7x13,
Dot: fixed.Point26_6{X: fixed.I(x), Y: fixed.I(y)},
}
d.DrawString(label)
}
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