Simplified the line type.

src/cmd/math/main.go

@@ -21,9 +21,7 @@ func main() {
 		}.Line(),
 	}
 	
-	for _, l := range lines {
-		fmt.Println(l.Equation())
-	}
+	for _, l := range lines { fmt.Println(l) }
 	/*t := gx.Triangle{
 		gx.Point{0, 0},
 		gx.Point{0, 100},

src/gx/line.go

@@ -4,17 +4,14 @@ import (
 	"math"
 )
 
-// The type represents mathematical equation of line.
-type LineEquation struct {
+// The type represents mathematical equation of line and line itself.
+type Line struct {
 	K, C Float
 }
 
 // The type represents a line segment.
 type LineSegment [2]Point
 
-// The type represents a line.
-type Line LineSegment
-
 // Get square of length of line segment.
 func (ls LineSegment) LenSqr() Float {
 	return Sqr(ls[0].X - ls[1].X) +
@@ -26,18 +23,14 @@ func (ls LineSegment) Len() Float {
 	return math.Sqrt(ls.LenSqr())
 }
 
-// Returns corresponding to the line segment line.
-func (ls LineSegment) Line() Line {
-	return Line(ls)
-}
-
-func (l Line) Equation() LineEquation {
+// Returns corresponding to the segment line line.
+func (l LineSegment) Line() Line {
 	p0 := l[0]
 	p1 := l[1]
 	
 	k := (p0.Y - p1.Y) / (p0.X - p1.X)
 	c := p0.Y - p0.X*k 
 	
-	return LineEquation{k, c}
+	return Line{k, c}
 }