1 files changed, 69 insertions, 0 deletions
diff --git a/lines/num.go b/lines/num.go
new file mode 100644
index 0000000..40becd0
--- /dev/null
+++ b/lines/num.go
@@ -0,0 +1,69 @@
+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)
+}