// RandomMirror builds an image with 10x10 grids of half diagonals
func RandomMirror(w http.ResponseWriter, colors []color.RGBA, size int, prob float64) {
canvas := svg.New(w)
canvas.Start(size, size)
lines := 10
fringeSize := size / lines
distance := distanceTo3rdPoint(fringeSize)
fringeSize = distance
lines = size / fringeSize
for xL := 0; xL <= lines/2; xL++ {
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}
fill1 := draw.FillFromRGBA(draw.RandomColorFromArrayWithFreq(colors, prob))
canvas.Polygon(xs, ys, fill1)
xs = mirrorCoordinates(xs, lines, fringeSize, 0)
canvas.Polygon(xs, ys, fill1)
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)
// in order to have a perfect hexagon,
// 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}
fill2 := draw.FillFromRGBA(draw.RandomColorFromArrayWithFreq(colors, prob))
canvas.Polygon(xs1, ys1, fill2)
xs1 = mirrorCoordinates(xs1, lines, fringeSize, 0)
canvas.Polygon(xs1, ys1, fill2)
}
}
canvas.End()
}
// Isogrids builds an image with 10x10 grids of half diagonals
func Isogrids(w http.ResponseWriter, key string, colors []color.RGBA, size, lines int) {
canvas := svg.New(w)
canvas.Start(size, size)
fringeSize := size / lines
distance := distanceTo3rdPoint(fringeSize)
lines = size / fringeSize
offset := ((fringeSize - distance) * lines) / 2
// triangle grid here:
for xL := -1; xL < lines/2; xL++ {
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 + offset, x1 + offset, x2 + offset}
ys := []int{y1, y2, y3}
fill1 := draw.FillFromRGBA(draw.PickColor(key, colors, (xL+3*yL+lines)%15))
canvas.Polygon(xs, ys, fill1)
xsMirror := mirrorCoordinates(xs, lines, distance, offset*2)
canvas.Polygon(xsMirror, ys, fill1)
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)
// in order to have a perfect hexagon,
// we make sure that the previous triangle and this one touch each other in this point.
y12 = y1 + fringeSize
}
xs1 := []int{x12 + offset, x11 + offset, x12 + offset}
ys1 := []int{y11, y12, y13}
fill2 := draw.FillFromRGBA(draw.PickColor(key, colors, (xL+3*yL+1+lines)%15))
canvas.Polygon(xs1, ys1, fill2)
xs1 = mirrorCoordinates(xs1, lines, distance, offset*2)
canvas.Polygon(xs1, ys1, fill2)
}
}
canvas.End()
}
// SVG builds an svg image with 6 by 6 quadrants of alternate colors.
func SVG(w http.ResponseWriter, key string, colors []color.RGBA, size int) {
canvas := svg.New(w)
canvas.Start(size, size)
squares := 6
quadrantSize := size / squares
middle := math.Ceil(float64(squares) / float64(2))
colorMap := make(map[int]color.RGBA)
for yQ := 0; yQ < squares; yQ++ {
y := yQ * quadrantSize
colorMap = make(map[int]color.RGBA)
for xQ := 0; xQ < squares; xQ++ {
x := xQ * quadrantSize
if _, ok := colorMap[xQ]; !ok {
if float64(xQ) < middle {
colorMap[xQ] = draw.PickColor(key, colors, xQ+3*yQ)
} else if xQ < squares {
colorMap[xQ] = colorMap[squares-xQ-1]
} else {
colorMap[xQ] = colorMap[0]
}
}
canvas.Rect(x, y, quadrantSize, quadrantSize, draw.FillFromRGBA(colorMap[xQ]))
}
}
canvas.End()
}
// triangleColors returns an array of strings, one for each sub triangle.
// Each string corresponds to an svg color.
// Colors are selected from the array of colors passed as parameter and the key.
func triangleColors(id int, key string, colors []color.RGBA, lines int) (tColors []string) {
for _, t := range triangles[id] {
x := t.x
y := t.y
tColors = append(tColors, draw.FillFromRGBA(draw.PickColor(key, colors, (x+3*y+lines)%15)))
}
return
}
// RandomGradient creates an isogrids svg image with half diagonals.
// colors are filled at random in the image with a frequency that decreases
// from left to right.
func RandomGradient(w http.ResponseWriter, colors []color.RGBA, width, height, lines int) {
canvas := svg.New(w)
canvas.Start(width, height)
fringeSize := width / lines
distance := distanceTo3rdPoint(fringeSize)
fringeSize = distance
lines = width / fringeSize
for xL := 0; xL < lines; xL++ {
percentage := 100 - int(float64(xL)/float64(lines)*100)
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}
canvas.Polygon(xs, ys, draw.FillFromRGBA(draw.ColorByPercentage(colors, percentage)))
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)
// in order to have a perfect hexagon,
// 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}
canvas.Polygon(xs1, ys1, draw.FillFromRGBA(draw.ColorByPercentage(colors, percentage)))
}
}
canvas.End()
}
// Random builds an image with 10x10 grids of half diagonals with random background.
// The image is symetric in the middle vertical axis.
func Random(w http.ResponseWriter, colors []color.RGBA, width, height, lines int, prob float64) {
canvas := svg.New(w)
canvas.Start(width, height)
fringeSize := width / lines
distance := distanceTo3rdPoint(fringeSize)
fringeSize = distance
lines = width / fringeSize
for xL := 0; xL < lines; xL++ {
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}
canvas.Polygon(xs, ys, draw.FillFromRGBA(draw.RandomColorFromArrayWithFreq(colors, prob)))
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}
canvas.Polygon(xs1, ys1, draw.FillFromRGBA(draw.RandomColorFromArrayWithFreq(colors, prob)))
}
}
canvas.End()
}
// PaletteSVG builds an SVG image with all the colors present in the theme color array.
func PaletteSVG(w http.ResponseWriter, theme []color.RGBA, width, height int) {
canvas := svg.New(w)
canvas.Start(width, height)
numColors := len(theme)
quadrant := width / numColors
for xQ := 0; xQ < numColors; xQ++ {
x := xQ * quadrant
currentQuadrant := (x / quadrant) % numColors
canvas.Rect(x, 0, quadrant, height, draw.FillFromRGBA(theme[currentQuadrant]))
}
canvas.End()
}
// 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()
}
// RandomGridSVG builds a grid image with with x colors selected at random for each quadrant.
func RandomGridSVG(w http.ResponseWriter, colors []color.RGBA, width, height, xSquares int, prob float64) {
canvas := svg.New(w)
canvas.Start(width, height)
squares := xSquares
quadrantSize := width / squares
colorMap := make(map[int]color.RGBA)
for yQ := 0; yQ < squares; yQ++ {
y := yQ * quadrantSize
colorMap = make(map[int]color.RGBA)
for xQ := 0; xQ < squares; xQ++ {
x := xQ * quadrantSize
if _, ok := colorMap[xQ]; !ok {
colorMap[xQ] = draw.RandomColorFromArrayWithFreq(colors, prob)
}
canvas.Rect(x, y, quadrantSize, quadrantSize, draw.FillFromRGBA(colorMap[xQ]))
}
}
canvas.End()
}
// RandomGradientGridSVG builds a grid image with with x colors selected at random for each quadrant.
func RandomGradientGridSVG(w http.ResponseWriter, colors []color.RGBA, width, height, xSquares int) {
canvas := svg.New(w)
canvas.Start(width, height)
squares := xSquares
quadrantSize := width / squares
colorMap := make(map[int]color.RGBA)
for yQ := 0; yQ < squares; yQ++ {
y := yQ * quadrantSize
colorMap = make(map[int]color.RGBA)
for xQ := 0; xQ < squares; xQ++ {
x := xQ * quadrantSize
if _, ok := colorMap[xQ]; !ok {
percentage := 100 - int(float64(xQ)/float64(squares)*100)
colorMap[xQ] = draw.ColorByPercentage(colors, percentage)
}
canvas.Rect(x, y, quadrantSize, quadrantSize, draw.FillFromRGBA(colorMap[xQ]))
}
}
canvas.End()
}
// GridSVG builds an image with 6 by 6 quadrants of alternate colors.
func GridSVG(w http.ResponseWriter, color1, color2 color.RGBA, size int) {
canvas := svg.New(w)
canvas.Start(size, size)
squares := 6
quadrantSize := size / squares
colorMap := make(map[int]color.RGBA)
for yQ := 0; yQ < squares; yQ++ {
y := yQ * quadrantSize
colorMap = make(map[int]color.RGBA)
for xQ := 0; xQ < squares; xQ++ {
x := xQ * quadrantSize
if _, ok := colorMap[xQ]; !ok {
if (xQ+yQ)%2 == 0 {
colorMap[xQ] = color1
} else {
colorMap[xQ] = color2
}
}
canvas.Rect(x, y, quadrantSize, quadrantSize, draw.FillFromRGBA(colorMap[xQ]))
}
}
canvas.End()
}
// SpaceInvaders builds a space invader svg image based on the 'key' and
// 'colors' passed as arguments. The svg image is written to the http.ResponseWriter passed as
// argument.
func SpaceInvaders(w http.ResponseWriter, key string, colors []color.RGBA, size int) {
canvas := svg.New(w)
canvas.Start(size, size)
invader := newInvader(key)
// log.Println(fmt.Sprintf("%+v\n", invader)) // for debug
squares := 11
quadrantSize := size / squares
middle := math.Ceil(float64(squares) / float64(2))
colorMap := make(map[int]color.RGBA)
// style of space invader background
canvas.Gstyle(draw.FillFromRGBA(colors[0]))
for yQ := 0; yQ < squares; yQ++ {
y := yQ * quadrantSize
colorMap = make(map[int]color.RGBA)
for xQ := 0; xQ < squares; xQ++ {
x := xQ * quadrantSize
fill := ""
if _, ok := colorMap[xQ]; !ok {
colorMap[xQ] = selectColor(colorMap, key, colors, middle, xQ, yQ, squares)
}
highBodyIndex := 2
if hasEyeOrAnthena(invader, &highBodyIndex, squares, xQ, yQ) {
fill = draw.FillFromRGBA(colorMap[xQ])
}
if hasArmOrExtension(invader, squares, xQ, yQ) {
fill = draw.FillFromRGBA(colorMap[xQ])
}
if yQ == 5 { // clean eye from arm extension
if eye, c := hasEye4(invader, colorMap, colors, xQ); eye {
fill = draw.FillFromRGBA(c)
}
}
if yQ == 6 {
if hasBody(invader, squares, xQ) {
fill = draw.FillFromRGBA(colorMap[xQ])
}
}
lowBodyIndex := 7
if hasBody2(invader, &lowBodyIndex, squares, xQ, yQ) {
fill = draw.FillFromRGBA(colorMap[xQ])
}
if hasArmOrExtension2(invader, lowBodyIndex, squares, xQ, yQ) {
fill = draw.FillFromRGBA(colorMap[xQ])
}
if hasLegOrFoot(invader, lowBodyIndex, xQ, yQ) {
fill = draw.FillFromRGBA(colorMap[xQ])
}
if len(fill) > 0 {
canvas.Rect(x, y, quadrantSize, quadrantSize, fill)
} else {
canvas.Rect(x, y, quadrantSize, quadrantSize)
}
}
}
canvas.Gend()
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()
}