feat: x bit polygons

main.go

@@ -3,11 +3,150 @@ package main
 import (
 	"crypto/sha1"
 	"fmt"
+	"slices"
 	"strconv"
 
 	"github.com/fogleman/gg"
 )
 
+func main() {
+	dc := gg.NewContext(800, 800)
+
+	XBitPolygons(dc, "Jaybee18", 8, 8)
+
+	dc.SavePNG("out.png")
+}
+
+func XBitPolygons(dc *gg.Context, username string, columns int, rows int) {
+	hash := hash(username)
+
+	dc.SetRGB255(255, 255, 255)
+	dc.DrawRectangle(0, 0, 800, 800)
+	dc.Fill()
+
+	colorString := hash[0:6]
+	r, g, b := rgbFromHex(colorString)
+	dc.SetRGB255(r, g, b)
+
+	enabledVertices := [][]bool{}
+	for _, character := range hash[6:6+rows+1] {
+		integer, _ := strconv.ParseUint(string(character), 16, columns/2+1)
+		row := []bool{}
+		for j := range columns/2+1 {
+			on := hasBit(integer, j)
+			row = append(row, on)
+		}
+		enabledVertices = append(enabledVertices, row)
+	}
+
+	w := 800 / columns
+	h := 800 / rows
+
+	for i := range rows {
+		for j := range columns/2 {
+			topLeft, tlx, tly := enabledVertices[i][j], float64(j*w), float64(i*h)
+			topRight, trx, try := enabledVertices[i][j+1], float64(j*w+w), float64(i*h)
+			bottomRight, brx, bry := enabledVertices[i+1][j+1], float64(j*w+w), float64(i*h+h)
+			bottomLeft, blx, bly := enabledVertices[i+1][j], float64(j*w), float64(i*h+h)
+			mx, my := tlx + float64(w/2), tly + float64(h/2)
+
+			count := 0
+			if topLeft {count++}
+			if topRight {count++}
+			if bottomRight {count++}
+			if bottomLeft {count++}
+
+			if topLeft && topRight {
+				dc.NewSubPath()
+				dc.MoveTo(mx, my)
+				dc.LineTo(tlx, tly)
+				dc.LineTo(trx, try)
+				dc.ClosePath()
+			}
+
+			if topRight && bottomRight {
+				dc.NewSubPath()
+				dc.MoveTo(mx, my)
+				dc.LineTo(trx, try)
+				dc.LineTo(brx, bry)
+				dc.ClosePath()
+			}
+
+			if bottomRight && bottomLeft {
+				dc.NewSubPath()
+				dc.MoveTo(mx, my)
+				dc.LineTo(brx, bry)
+				dc.LineTo(blx, bly)
+				dc.ClosePath()
+			}
+
+			if bottomLeft && topLeft {
+				dc.NewSubPath()
+				dc.MoveTo(mx, my)
+				dc.LineTo(blx, bly)
+				dc.LineTo(tlx, tly)
+				dc.ClosePath()
+			}
+			dc.Fill()
+		}
+	}
+
+	// Reverse
+	for i := range len(enabledVertices) {
+		slices.Reverse(enabledVertices[i])
+	}
+
+	// Mirror left side
+	for i := range rows {
+		for j := range columns/2 {
+			topLeft, tlx, tly := enabledVertices[i][j], float64(w*(columns/2)+j*w), float64(i*h)
+			topRight, trx, try := enabledVertices[i][j+1], float64(w*(columns/2)+j*w+w), float64(i*h)
+			bottomRight, brx, bry := enabledVertices[i+1][j+1], float64(w*(columns/2)+j*w+w), float64(i*h+h)
+			bottomLeft, blx, bly := enabledVertices[i+1][j], float64(w*(columns/2)+j*w), float64(i*h+h)
+			mx, my := tlx+float64(w/2), tly+float64(h/2)
+
+			count := 0
+			if topLeft {count++}
+			if topRight {count++}
+			if bottomRight {count++}
+			if bottomLeft {count++}
+
+			if topLeft && topRight {
+				dc.NewSubPath()
+				dc.MoveTo(mx, my)
+				dc.LineTo(tlx, tly)
+				dc.LineTo(trx, try)
+				dc.ClosePath()
+			}
+
+			if topRight && bottomRight {
+				dc.NewSubPath()
+				dc.MoveTo(mx, my)
+				dc.LineTo(trx, try)
+				dc.LineTo(brx, bry)
+				dc.ClosePath()
+			}
+
+			if bottomRight && bottomLeft {
+				dc.NewSubPath()
+				dc.MoveTo(mx, my)
+				dc.LineTo(brx, bry)
+				dc.LineTo(blx, bly)
+				dc.ClosePath()
+			}
+
+			if bottomLeft && topLeft {
+				dc.NewSubPath()
+				dc.MoveTo(mx, my)
+				dc.LineTo(blx, bly)
+				dc.LineTo(tlx, tly)
+				dc.ClosePath()
+			}
+			dc.Fill()
+		}
+	}
+}
+
 /*
 8x8 square of 100x100 px squares
 
@@ -27,10 +166,8 @@ c = 1 1 0 0
 ...
 b = 1 0 1 1
 */
-func main() {
-	dc := gg.NewContext(800, 800)
-
-	hash := hash("Jaybee18")
+func FourBitSquares(dc *gg.Context, username string) {
+	hash := hash(username)
 
 	colorString := hash[0:6]
 	r, g, b := rgbFromHex(colorString)
@@ -51,8 +188,6 @@ func main() {
 			dc.Fill()
 		}
 	}
-
-	dc.SavePNG("out.png")
 }
 
 func rgbFromHex(hex string) (int, int, int) {