Added tileblueprint.

- Utility that generates a PNG with tiles.

cmd/tileblueprint/tileblueprint.go

@@ -0,0 +1,64 @@
+package main
+
+import (
+	"errors"
+	"flag"
+	"image"
+	"image/color"
+	"log"
+
+	"github.com/llgcode/draw2d/draw2dkit"
+
+	"github.com/llgcode/draw2d/draw2dimg"
+)
+
+func main() {
+	err := run()
+	if err != nil {
+		log.Fatal(err)
+	}
+}
+
+func run() error {
+	var dpi int
+	flag.IntVar(&dpi, "dpi", 300, "dpi")
+	flag.Parse()
+	path := flag.Arg(0)
+	if path == "" {
+		return errors.New("no output path specified")
+	}
+
+	bounds := image.Rect(0, 0, dpi*827/100, dpi*1169/100)
+	scale := float64(dpi) / 100
+	margin := 5. * scale
+	tileWidth, tileHeight := 140.*scale, 200.*scale
+	tileOffsetWidth, tileOffsetHeight := tileWidth+4.*margin, tileHeight+4.*margin
+	im := image.NewRGBA(bounds)
+	gc := draw2dimg.NewGraphicContext(im)
+	marginColor := color.Gray{Y: 63}
+	tileColor := color.Gray{Y: 127}
+	gc.SetLineWidth(1)
+	for y := 0.; y < float64(bounds.Max.Y)-tileOffsetHeight; y += tileOffsetHeight {
+		for x := 0.; x < float64(bounds.Max.X)-tileOffsetWidth; x += tileOffsetWidth {
+			draw2dkit.Rectangle(gc, x+margin-1, y+margin-1, x+tileOffsetWidth-margin, y+tileOffsetHeight-margin)
+			gc.SetStrokeColor(marginColor)
+			gc.Stroke()
+
+			tileX, tileY := x+2*margin-.5, y+2*margin-.5
+			gc.MoveTo(tileX, tileY+.25*tileHeight)
+			gc.LineTo(tileX, tileY+.75*tileHeight)
+			gc.LineTo(tileX+.5*tileWidth, tileY+tileHeight)
+			gc.LineTo(tileX+tileWidth, tileY+.75*tileHeight)
+			gc.LineTo(tileX+tileWidth, tileY+.25*tileHeight)
+			gc.LineTo(tileX+.5*tileWidth, tileY+.5*tileHeight)
+			gc.LineTo(tileX, tileY+.25*tileHeight)
+			gc.LineTo(tileX+.5*tileWidth, tileY)
+			gc.LineTo(tileX+tileWidth, tileY+.25*tileHeight)
+			gc.MoveTo(tileX+.5*tileWidth, tileY+.5*tileHeight)
+			gc.LineTo(tileX+.5*tileWidth, tileY+tileHeight)
+			gc.SetStrokeColor(tileColor)
+			gc.Stroke()
+		}
+	}
+	return draw2dimg.SaveToPngFile(path, im)
+}