add random isogrid example (56141986) · Commits · blackheaven / tinygraphs

app-backend/main.go

+1 −0

Original line number	Diff line number	Diff line
		@@ -32,6 +32,7 @@ func main() {
		r.HandleFunc("/isogrids/halfdiagonals/[a-zA-Z0-9]+/?", isogrids.HalfDiagonals)
		r.HandleFunc("/isogrids/gridbw/[a-zA-Z0-9]+/?", isogrids.GridBW)
		r.HandleFunc("/isogrids/grid2colors/[a-zA-Z0-9]+/?", isogrids.Grid2Colors)
		r.HandleFunc("/isogrids/grid2colorsrandom/[a-zA-Z0-9]+/?", isogrids.Grid2ColorsRandom)
		r.HandleFunc("/isogrids/[a-zA-Z0-9]+/?", isogrids.Isogrids)

		r.AddStaticResource(root)

controllers/isogrids/isogrids.go

+24 −0

Original line number	Diff line number	Diff line
		@@ -161,3 +161,27 @@ func Grid2Colors(w http.ResponseWriter, r *http.Request) {
		draw.Isogrids2Colors(w, key, bg, fg, size)
		}
		}

		func Grid2ColorsRandom(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.IsogridsRandom2Colors(w, key, bg, fg, size)
		}
		}

draw/isogrids.go

+92 −2

Original line number	Diff line number	Diff line
		@@ -250,8 +250,8 @@ func Isogrids2Colors(w http.ResponseWriter, key string, color1, color2 color.RGB
		}

		// triangle grid here:
		for xL := 0; xL <= lines; xL++ {
		for yL := 0; yL <= lines; yL++ {
		for xL := -1; xL <= lines; xL++ {
		for yL := -1; yL <= lines; yL++ {
		var x1, x2, x3, y1, y2, y3 int
		if (xL % 2) == 0 {
		x1 = (xL) * fringeSize
		@@ -297,3 +297,93 @@ func Isogrids2Colors(w http.ResponseWriter, key string, color1, color2 color.RGB

		canvas.End()
		}

		// Isogrids builds an image with 10x10 grids of half diagonals
		func IsogridsRandom2Colors(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)
		}
		}

		// triangle grid here:
		for xL := -1; xL <= lines; xL++ {
		for yL := -1; yL <= lines; yL++ {
		var x1, x2, x3, y1, y2, y3 int
		if (xL % 2) == 0 {
		x1 = (xL) * fringeSize
		x2 = (xL + 1) * fringeSize
		x3 = x1
		y1 = yL * fringeSize
		y2 = y1 + fringeSize/2
		y3 = (yL + 1) * fringeSize
		} else {
		x1 = (xL + 1) * fringeSize
		x2 = xL * fringeSize
		x3 = x1
		y1 = yL * fringeSize
		y2 = y1 + fringeSize/2
		y3 = (yL + 1) * fringeSize
		}
		xs := []int{x1, x2, x3}
		ys := []int{y1, y2, y3}
		canvas.Polygon(xs, ys, fmt.Sprintf("stroke:black;stroke-width:2; %s", fillFromRGBA(randomColor(color1, color2))))

		var x11, x12, x13, y11, y12, y13 int
		if (xL % 2) == 0 {
		x11 = (xL + 1) * fringeSize
		x12 = (xL) * fringeSize
		x13 = x11
		y11 = yL*fringeSize + fringeSize/2
		y12 = y11 + fringeSize/2
		y13 = (yL+1)*fringeSize + fringeSize/2
		} else {
		x11 = (xL) * fringeSize
		x12 = (xL + 1) * fringeSize
		x13 = x11
		y11 = yL*fringeSize + fringeSize/2
		y12 = y1 + fringeSize
		y13 = (yL+1)*fringeSize + fringeSize/2
		}
		xs1 := []int{x11, x12, x13}
		ys1 := []int{y11, y12, y13}
		canvas.Polygon(xs1, ys1, fmt.Sprintf("stroke:black;stroke-width:2; %s", fillFromRGBA(randomColor(color1, color2))))
		}
		}
		canvas.End()
		}