// RandomGradientColorSVG builds a square image with with x colors selected at random for each quadrant.
// the background color stays the same the other colors get mixed in a gradient color from the first one to the last one.
func RandomGradientColorSVG(w http.ResponseWriter, colors, gColors []color.RGBA, gv colors.GradientVector, width, height, xsquares int, prob float64) {
var gradientColors []svg.Offcolor
gradientColors = make([]svg.Offcolor, len(gColors))
percentage := uint8(0)
step := uint8(100 / len(gColors))
for i, c := range gColors {
gradientColors[i] = svg.Offcolor{
Offset: percentage,
Color: draw.RGBToHex(c.R, c.G, c.B),
Opacity: 1,
}
percentage += step
}
canvas := svg.New(w)
canvas.Start(width, height)
canvas.Def()
canvas.LinearGradient("gradientColors", gv.X1, gv.Y1, gv.X2, gv.Y2, gradientColors)
canvas.DefEnd()
canvas.Rect(0, 0, width, height, "fill:url(#gradientColors)")
squares := xsquares
quadrantSize := width / squares
colorMap := make(map[int]color.RGBA)
colorIndex := make(map[int]int)
for yQ := 0; yQ < squares; yQ++ {
y := yQ * quadrantSize
colorMap = make(map[int]color.RGBA)
colorIndex = make(map[int]int)
for xQ := 0; xQ <= squares+1; xQ++ {
x := xQ * quadrantSize
if _, ok := colorMap[xQ]; !ok {
colorIndex[xQ] = draw.RandomIndexFromArrayWithFreq(colors, prob)
colorMap[xQ] = colors[colorIndex[xQ]]
}
if colorIndex[xQ] == 0 {
fill := draw.FillFromRGBA(colorMap[xQ])
canvas.Rect(x, y, quadrantSize, quadrantSize, fill)
}
}
}
canvas.End()
}
// RandomGradientColor builds a isogrid image with with x colors selected at random for each quadrant.
// the background color stays the same the other colors get mixed in a gradient color from the first one to the last one.
func RandomGradientColor(w http.ResponseWriter, colors, gColors []color.RGBA, gv colors.GradientVector, width, height, lines int, prob float64) {
var gradientColors []svg.Offcolor
gradientColors = make([]svg.Offcolor, len(gColors))
percentage := uint8(0)
step := uint8(100 / len(gColors))
for i, c := range gColors {
gradientColors[i] = svg.Offcolor{
Offset: percentage,
Color: draw.RGBToHex(c.R, c.G, c.B),
Opacity: 1,
}
percentage += step
}
canvas := svg.New(w)
canvas.Start(width, height)
canvas.Def()
canvas.LinearGradient("gradientColors", gv.X1, gv.Y1, gv.X2, gv.Y2, gradientColors)
canvas.DefEnd()
canvas.Rect(0, 0, width, height, "fill:url(#gradientColors)")
fringeSize := width / lines
distance := distanceTo3rdPoint(fringeSize)
fringeSize = distance
lines = width / fringeSize
colorMap := make(map[int]color.RGBA)
colorIndex := make(map[int]int)
for xL := 0; xL <= lines; xL++ {
colorMap = make(map[int]color.RGBA)
colorIndex = make(map[int]int)
for yL := -1; yL <= lines; yL++ {
var x1, x2, y1, y2, y3 int
if (xL % 2) == 0 {
x1, y1, x2, y2, _, y3 = right1stTriangle(xL, yL, fringeSize, distance)
} else {
x1, y1, x2, y2, _, y3 = left1stTriangle(xL, yL, fringeSize, distance)
}
xs := []int{x2, x1, x2}
ys := []int{y1, y2, y3}
colorIndex[yL] = draw.RandomIndexFromArrayWithFreq(colors, prob)
colorMap[yL] = colors[colorIndex[yL]]
if colorIndex[yL] == 0 {
canvas.Polygon(xs, ys, draw.FillFromRGBA(colorMap[yL]))
}
var x11, x12, y11, y12, y13 int
if (xL % 2) == 0 {
x11, y11, x12, y12, _, y13 = left2ndTriangle(xL, yL, fringeSize, distance)
// we make sure that the previous triangle and this one touch each other in this point.
y12 = y3
} else {
x11, y11, x12, y12, _, y13 = right2ndTriangle(xL, yL, fringeSize, distance)
// we make sure that the previous triangle and this one touch each other in this point.
y12 = y1 + fringeSize
}
xs1 := []int{x12, x11, x12}
ys1 := []int{y11, y12, y13}
colorIndex[yL] = draw.RandomIndexFromArrayWithFreq(colors, prob)
colorMap[yL] = colors[colorIndex[yL]]
if colorIndex[yL] == 0 {
canvas.Polygon(xs1, ys1, draw.FillFromRGBA(colorMap[yL]))
}
}
}
canvas.End()
}