69 lines
1.3 KiB
Go
69 lines
1.3 KiB
Go
package main
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import (
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"crypto/sha1"
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"fmt"
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"strconv"
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"github.com/fogleman/gg"
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)
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// 8x8 square of 100x100 px squares
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func main() {
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dc := gg.NewContext(800, 800)
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hash := hash("InsightForgeOrg")
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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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for i, character := range hash[6:14] {
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tmp, _ := strconv.ParseUint(string(character), 16, 8)
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n := int(tmp)
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for _, v := range []uint{0, 1, 2, 3} {
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on := hasBit(n, v)
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dc.DrawRectangle(float64(v * 100), float64(i * 100), 100, 100)
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dc.DrawRectangle(700 - float64(v * 100), float64(i * 100), 100, 100)
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if !on {
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dc.SetRGB255(r, g, b)
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} else {
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dc.SetRGB255(255, 255, 255)
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}
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dc.Fill()
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}
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}
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dc.SavePNG("out.png")
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}
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func rgbFromHex(hex string) (int, int, int) {
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r, _ := strconv.ParseUint(hex[0:2], 16, 8)
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g, _ := strconv.ParseUint(hex[2:4], 16, 8)
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b, _ := strconv.ParseUint(hex[4:6], 16, 8)
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return int(r), int(g), int(b)
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}
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func hash(str string) string {
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h := sha1.New()
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h.Write([]byte(str))
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res := h.Sum(nil)
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return fmt.Sprintf("%x", res)
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}
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func hasBit(n int, pos uint) bool {
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val := n & (1 << pos)
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return (val > 0)
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}
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// 9d26bf3cf1fb2b2f02d4a2013333f4fcd551cb2e
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// 9d26bf -> color
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// 3 -> row1
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// c -> row2
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// ...
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// b -> row8
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// 3 = 0 0 1 1
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//
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