can rotate text + add y axis names

drawing/matrix.go

@@ -161,10 +161,10 @@ func (tr *Matrix) Translate(tx, ty float64) {
 	tr[5] = ty*tr[3] + tx*tr[1] + tr[5]
 }
 
-// Rotate adds a rotation to the matrix. angle is in radian
-func (tr *Matrix) Rotate(angle float64) {
-	c := math.Cos(angle)
-	s := math.Sin(angle)
+// Rotate adds a rotation to the matrix.
+func (tr *Matrix) Rotate(radians float64) {
+	c := math.Cos(radians)
+	s := math.Sin(radians)
 	t0 := c*tr[0] + s*tr[2]
 	t1 := s*tr[3] + c*tr[1]
 	t2 := c*tr[2] - s*tr[0]

drawing/text.go

@@ -22,14 +22,10 @@ func DrawContour(path PathBuilder, ps []truetype.Point, dx, dy float64) {
 			} else {
 				path.QuadCurveTo(q0X+dx, q0Y+dy, qX+dx, qY+dy)
 			}
-		} else {
-			if on0 {
-				// No-op.
-			} else {
-				midX := (q0X + qX) / 2
-				midY := (q0Y + qY) / 2
-				path.QuadCurveTo(q0X+dx, q0Y+dy, midX+dx, midY+dy)
-			}
+		} else if !on0 {
+			midX := (q0X + qX) / 2
+			midY := (q0Y + qY) / 2
+			path.QuadCurveTo(q0X+dx, q0Y+dy, midX+dx, midY+dy)
 		}
 		q0X, q0Y, on0 = qX, qY, on
 	}