add color handler (622635eb) · Commits · blackheaven / tinygraphs

app-backend/main.go

+1 −0

Original line number	Diff line number	Diff line
		@@ -29,6 +29,7 @@ func main() {
		r.HandleFunc("/isogrids/skeleton/[a-zA-Z0-9]+/?", isogrids.Skeleton)
		r.HandleFunc("/isogrids/diagonals/[a-zA-Z0-9]+/?", isogrids.Diagonals)
		r.HandleFunc("/isogrids/halfdiagonals/[a-zA-Z0-9]+/?", isogrids.HalfDiagonals)
		r.HandleFunc("/isogrids/color/[a-zA-Z0-9]+/?", isogrids.Color)
		r.HandleFunc("/isogrids/[a-zA-Z0-9]+/?", isogrids.Isogrids)

		r.AddStaticResource(root)

+24 −0

Original line number	Diff line number	Diff line
		@@ -113,3 +113,27 @@ func HalfDiagonals(w http.ResponseWriter, r *http.Request) {
		draw.HalfDiagonals(w, key, bg, fg, size)
		}
		}

		func Color(w http.ResponseWriter, r *http.Request) {

		if id, err := misc.PermalinkString(r, 3); err != nil {
		log.Printf("error when extracting permalink id: %v", err)
		} else {
		h := md5.New()
		io.WriteString(h, id)
		key := fmt.Sprintf("%x", h.Sum(nil)[:])

		colorMap := tgColors.MapOfColorPatterns()
		bg, err1 := extract.Background(r)
		if err1 != nil {
		bg = colorMap[0][0]
		}
		fg, err2 := extract.Foreground(r)
		if err2 != nil {
		fg = colorMap[0][1]
		}
		size := extract.Size(r)
		write.ImageSVG(w)
		draw.IsogridsColor(w, key, bg, fg, size)
		}
		}

+47 −0

Original line number	Diff line number	Diff line
		@@ -134,3 +134,50 @@ func IsogridsSkeleton(w http.ResponseWriter, key string, color1, color2 color.RG

		canvas.End()
		}

		// Isogrids builds an image with 10x10 grids of half diagonals
		func IsogridsColor(w http.ResponseWriter, key string, color1, color2 color.RGBA, size int) {
		canvas := svg.New(w)
		size = 400
		canvas.Start(size, size)

		lines := 10
		fringeSize := size / lines

		// vertical lines
		for xL := 0; xL <= lines; xL++ {
		x := xL * fringeSize
		firstY := 0
		lastY := (lines) * fringeSize
		style := fmt.Sprintf("stroke:black;stroke-width:2; %s", fillFromRGBA(color2))
		if (xL % 2) != 0 {
		lastY = lastY - fringeSize/2
		firstY = fringeSize / 2
		}
		canvas.Line(x, firstY, x, lastY, style)
		}

		// y -- > x up right
		for xL := 0; xL <= 2*lines; xL++ {
		x := xL * fringeSize
		style := fmt.Sprintf("stroke:black;stroke-width:2; %s", fillFromRGBA(color2))
		xPrev := 0
		yPrev := (xL) * fringeSize
		if yPrev > 0 {
		canvas.Line(xPrev, yPrev, x*2, 0, style)
		}
		}
		// x --> y down right
		for xL := -2 * lines; xL <= 2*lines; xL++ {
		x := xL * fringeSize * 2
		style := fmt.Sprintf("stroke:black;stroke-width:2; %s", fillFromRGBA(color2))
		xPrev := lines * fringeSize
		yPrev := (lines - xL2) fringeSize
		if yPrev > 0 {
		canvas.Line(x, 0, xPrev, yPrev/2, style)
		}
		}

		// color here:
		canvas.End()
		}