add gradient random isogrids banner #36 (860b4244) · Commits · blackheaven / tinygraphs

app-backend/main.go

+2 −0

Original line number	Diff line number	Diff line
		@@ -28,6 +28,8 @@ func main() {
		r.HandleFunc("/squares/:key", squares.Square) //cached

		r.HandleFunc("/isogrids/banner/random", isogrids.BannerRandom)
		r.HandleFunc("/isogrids/banner/random/gradient", isogrids.BannerRandomGradient)

		r.HandleFunc("/isogrids/:key", isogrids.Isogrids)
		r.HandleFunc("/spaceinvaders/:key", spaceinvaders.SpaceInvaders)

controllers/isogrids/banner.go

+31 −0

Original line number	Diff line number	Diff line
		@@ -40,3 +40,34 @@ func BannerRandom(w http.ResponseWriter, r *http.Request) {
		write.ImageSVG(w)
		isogrids.Random(w, "", colors, width, height, xt)
		}

		// BannerRandomGradinet handler for /isogrids/banner/random/gradient.
		// Generates a random gradient banner isogrid image.
		func BannerRandomGradient(w http.ResponseWriter, r *http.Request) {
		width := extract.Width(r)
		height := extract.Height(r)

		colorMap := colors.MapOfColorThemes()
		bg, fg := extract.ExtraColors(r, colorMap)
		theme := extract.Theme(r)
		if val, ok := colorMap[theme]; ok {
		bg = val[0]
		fg = val[1]
		}

		var colors []color.RGBA
		if theme != "base" {
		if _, ok := colorMap[theme]; ok {
		numColors := extract.NumColors(r)
		colors = append(colors, colorMap[theme][0:numColors]...)
		} else {
		colors = append(colors, colorMap["base"]...)
		}
		} else {
		colors = append(colors, bg, fg)
		}

		xt := extract.XTriangles(r)
		write.ImageSVG(w)
		isogrids.RandomGradient(w, "", colors, width, height, xt)
		}

draw/isogrids/isogrids.go

+55 −0

Original line number	Diff line number	Diff line
		@@ -63,6 +63,61 @@ func Random(w http.ResponseWriter, key string, colors []color.RGBA, width, heigh
		canvas.End()
		}

		// Random creates an isogrids svg image with half diagonals.
		func RandomGradient(w http.ResponseWriter, key string, colors []color.RGBA, width, height, lines int) {
		canvas := svg.New(w)
		canvas.Start(width, height)

		fringeSize := width / lines

		// triangle grid here:
		for xL := -1; xL <= lines; xL++ {
		percentage := int(float64(xL) / float64(lines) * 100)
		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, draw.FillFromRGBA(draw.ColorByPercentage(colors, percentage))) //draw.RandomColorFromArray(colors)))

		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, draw.FillFromRGBA(draw.ColorByPercentage(colors, percentage))) //draw.RandomColorFromArray(colors)))
		}
		}
		canvas.End()
		}

		// RandomMirror builds an image with 10x10 grids of half diagonals
		func RandomMirror(w http.ResponseWriter, key string, colors []color.RGBA, size int) {
		canvas := svg.New(w)