139 lines
3.1 KiB
Go
139 lines
3.1 KiB
Go
package main
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import (
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"slices"
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"strconv"
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"github.com/fogleman/gg"
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)
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func XBitPolygons(dc *gg.Context, username string, columns int, rows int) {
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hash := hash(username)
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dc.SetRGB255(255, 255, 255)
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dc.DrawRectangle(0, 0, 800, 800)
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dc.Fill()
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colorString := hash[0:6]
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r, g, b := rgbFromHex(colorString)
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dc.SetRGB255(r, g, b)
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enabledVertices := [][]bool{}
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for _, character := range hash[6:6+rows+1] {
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integer, _ := strconv.ParseUint(string(character), 16, columns/2+1)
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row := []bool{}
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for j := range columns/2+1 {
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on := hasBit(integer, j)
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row = append(row, on)
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}
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enabledVertices = append(enabledVertices, row)
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}
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w := 800 / columns
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h := 800 / rows
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for i := range rows {
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for j := range columns/2 {
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topLeft, tlx, tly := enabledVertices[i][j], float64(j*w), float64(i*h)
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topRight, trx, try := enabledVertices[i][j+1], float64(j*w+w), float64(i*h)
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bottomRight, brx, bry := enabledVertices[i+1][j+1], float64(j*w+w), float64(i*h+h)
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bottomLeft, blx, bly := enabledVertices[i+1][j], float64(j*w), float64(i*h+h)
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mx, my := tlx + float64(w/2), tly + float64(h/2)
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count := 0
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if topLeft {count++}
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if topRight {count++}
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if bottomRight {count++}
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if bottomLeft {count++}
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if topLeft && topRight {
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dc.NewSubPath()
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dc.MoveTo(mx, my)
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dc.LineTo(tlx, tly)
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dc.LineTo(trx, try)
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dc.ClosePath()
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}
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if topRight && bottomRight {
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dc.NewSubPath()
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dc.MoveTo(mx, my)
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dc.LineTo(trx, try)
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dc.LineTo(brx, bry)
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dc.ClosePath()
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}
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if bottomRight && bottomLeft {
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dc.NewSubPath()
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dc.MoveTo(mx, my)
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dc.LineTo(brx, bry)
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dc.LineTo(blx, bly)
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dc.ClosePath()
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}
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if bottomLeft && topLeft {
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dc.NewSubPath()
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dc.MoveTo(mx, my)
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dc.LineTo(blx, bly)
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dc.LineTo(tlx, tly)
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dc.ClosePath()
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}
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dc.Fill()
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}
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}
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// Reverse
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for i := range len(enabledVertices) {
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slices.Reverse(enabledVertices[i])
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}
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// Mirror left side
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for i := range rows {
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for j := range columns/2 {
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topLeft, tlx, tly := enabledVertices[i][j], float64(w*(columns/2)+j*w), float64(i*h)
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topRight, trx, try := enabledVertices[i][j+1], float64(w*(columns/2)+j*w+w), float64(i*h)
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bottomRight, brx, bry := enabledVertices[i+1][j+1], float64(w*(columns/2)+j*w+w), float64(i*h+h)
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bottomLeft, blx, bly := enabledVertices[i+1][j], float64(w*(columns/2)+j*w), float64(i*h+h)
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mx, my := tlx+float64(w/2), tly+float64(h/2)
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count := 0
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if topLeft {count++}
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if topRight {count++}
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if bottomRight {count++}
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if bottomLeft {count++}
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if topLeft && topRight {
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dc.NewSubPath()
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dc.MoveTo(mx, my)
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dc.LineTo(tlx, tly)
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dc.LineTo(trx, try)
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dc.ClosePath()
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}
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if topRight && bottomRight {
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dc.NewSubPath()
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dc.MoveTo(mx, my)
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dc.LineTo(trx, try)
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dc.LineTo(brx, bry)
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dc.ClosePath()
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}
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if bottomRight && bottomLeft {
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dc.NewSubPath()
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dc.MoveTo(mx, my)
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dc.LineTo(brx, bry)
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dc.LineTo(blx, bly)
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dc.ClosePath()
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}
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if bottomLeft && topLeft {
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dc.NewSubPath()
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dc.MoveTo(mx, my)
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dc.LineTo(blx, bly)
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dc.LineTo(tlx, tly)
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dc.ClosePath()
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}
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dc.Fill()
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}
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}
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}
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