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Option to create custom-hexagon shape #13

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28 changes: 28 additions & 0 deletions polygon.go
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,7 @@ type CustomPolygon struct {
RelTo string `json:"rel_to"`
RelAbs string `json:"-"`
Width float64 `json:"width"`
Angle float64 `json:"angle"`
}

// Sets the path to the absolute positioning of the Path relative to an origin Point 'r'.
Expand Down Expand Up @@ -182,6 +183,13 @@ func (k *KAD) FinalizePolygons() {
}
}
break
case "custom-hexagon":
for _, path := range paths {
for _, pt := range path {
polygons = append(polygons, HexagonPolygon(pt.X, pt.Y, cp.Radius, cp.Angle))
}
}
break
case "custom-path":
for _, path := range paths {
if len(path) > 2 {
Expand Down Expand Up @@ -397,6 +405,26 @@ func CirclePolygon(cx, cy, r float64, s int) Path {
return pts
}

// create a regular hexagon with vertices at distance 'r' from the center.
// set 'a' (angle in degrees) to rotate the hexagon around its center.
func HexagonPolygon(cx, cy, r float64, a float64) Path {
// make a hexagon
hexagon := func(x, y, r float64, a float64, ps *Path) {
p := &Point{x, y}
*ps = append(*ps, *p)
for j := 0.0; j <= 6.0; j++ {
aj := a + 60.0*j
p.X = x + r * math.Cos(radians(aj))
p.Y = y + r * math.Sin(radians(aj))
*ps = append(*ps, *p)
}
}
// draw the hexagon
pts := make(Path, 0)
hexagon(cx, cy, r, a, &pts)
return pts
}

// create a superellipse as a polygon with each quarter made up of 's' segments.
func SuperellipsePolygon(cx, cy, r float64, s int) Path {
// make a concave quadrant
Expand Down