removing 3rd party deps.

drawing/util.go

@@ -0,0 +1,56 @@
+package drawing
+
+import (
+	"math"
+
+	"golang.org/x/image/math/fixed"
+
+	"github.com/golang/freetype/raster"
+	"github.com/golang/freetype/truetype"
+)
+
+func abs(i int) int {
+	if i < 0 {
+		return -i
+	}
+	return i
+}
+
+func distance(x1, y1, x2, y2 float64) float64 {
+	return vectorDistance(x2-x1, y2-y1)
+}
+
+func vectorDistance(dx, dy float64) float64 {
+	return float64(math.Sqrt(dx*dx + dy*dy))
+}
+
+func toFtCap(c LineCap) raster.Capper {
+	switch c {
+	case RoundCap:
+		return raster.RoundCapper
+	case ButtCap:
+		return raster.ButtCapper
+	case SquareCap:
+		return raster.SquareCapper
+	}
+	return raster.RoundCapper
+}
+
+func toFtJoin(j LineJoin) raster.Joiner {
+	switch j {
+	case RoundJoin:
+		return raster.RoundJoiner
+	case BevelJoin:
+		return raster.BevelJoiner
+	}
+	return raster.RoundJoiner
+}
+
+func pointToF64Point(p truetype.Point) (x, y float64) {
+	return fUnitsToFloat64(p.X), -fUnitsToFloat64(p.Y)
+}
+
+func fUnitsToFloat64(x fixed.Int26_6) float64 {
+	scaled := x << 2
+	return float64(scaled/256) + float64(scaled%256)/256.0
+}