Commit d82cdf8f authored by santiaago's avatar santiaago
Browse files

add color gradient logic. It doesn't great, let's try in banners to see how it looks.

parent 80eceb99

controllers/squares/gradient.go

+2 −9
Original line number Diff line number Diff line
@@ -15,14 +15,14 @@ import ( 
	"github.com/taironas/tinygraphs/write"

)



// Gradient handler for "/squares/gradient"

// Gradient handler for "/squares/gradient/:key"

// generates a color gradient random grid image.

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

	var err error

	var key string

	if key, err = route.Context.Get(r, "key"); err != nil {

		log.Println("Unable to get 'key' value: ", err)

		key = "hello"

		key = ""

	}



	theme := extract.Theme(r)
@@ -48,13 +48,6 @@ func Gradient(w http.ResponseWriter, r *http.Request) { 
	}



	size := extract.Size(r)

	// if f := extract.Format(r); f == format.JPEG {

	// 	m := image.NewRGBA(image.Rect(0, 0, size, size))

	// 	squares.Squares(m, key, colors)

	// 	var img image.Image = m

	// 	write.ImageJPEG(w, &img)

	// } else if f == format.SVG {

	write.ImageSVG(w)

	squares.GradientSVG(w, key, colors, size)

	// }

}

draw/squares/gradient.go

+21 −9
Original line number Diff line number Diff line 
package squares



import (

	"fmt"

	"image/color"

	"math"

	"net/http"
@@ -12,17 +13,22 @@ import ( 
// GradientSVG builds an image with 6 by 6 quadrants of alternate colors.

func GradientSVG(w http.ResponseWriter, key string, colors []color.RGBA, size int) {



	rainbow := []svg.Offcolor{

		{10, "#00cc00", 1},

		{30, "#006600", 1},

		{70, "#cc0000", 1},

		{90, "#000099", 1}}

	var gradientColors []svg.Offcolor

	gradientColors = make([]svg.Offcolor, len(colors))

	percentage := uint8(100 / len(colors))



	step := uint8(100 / len(colors))

	for i, c := range colors {

		gradientColors[i] = svg.Offcolor{percentage, RGBToHex(c.R, c.G, c.B), 1}

		percentage += step

	}



	canvas := svg.New(w)

	canvas.Start(size, size)

	canvas.Def()

	canvas.LinearGradient("rainbow", 0, 0, uint8(size), 0, rainbow)

	canvas.LinearGradient("gradientColors", 0, 0, uint8(size), 0, gradientColors)

	canvas.DefEnd()

	canvas.Rect(0, 0, size, size, "fill:url(#rainbow)")

	canvas.Rect(0, 0, size, size, "fill:url(#gradientColors)")



	squares := 6

	quadrantSize := size / squares
@@ -49,12 +55,18 @@ func GradientSVG(w http.ResponseWriter, key string, colors []color.RGBA, size in 
				}

			}

			if colorIndex[xQ] != 0 {

				fill = "fill:none; opacity:0.3"

			} else {

				fill = draw.FillFromRGBA(colorMap[xQ])

			} else {

				fill = "fill:none"



			}

			canvas.Rect(x, y, quadrantSize, quadrantSize, fill)

		}

	}

	canvas.End()

}



// RGBToHex converts an RGB triple to an Hex string.

func RGBToHex(r, g, b uint8) string {

	return fmt.Sprintf("#%02X%02X%02X", r, g, b)

}