contourline: Make line size configurable

arts/contourline.go

@@ -1,21 +1,24 @@
 package arts
 
 import (
+	"math"
+	"math/rand"
+
 	"github.com/fogleman/gg"
 	"github.com/jdxyw/generativeart"
 	"github.com/jdxyw/generativeart/common"
-	"math"
-	"math/rand"
 )
 
 type contourLine struct {
-	lineNum int
+	lineNum  int
+	lineSize float64
 }
 
 // NewContourLine returns a contourLine object.
-func NewContourLine(lineNum int) *contourLine {
+func NewContourLine(lineNum int, lineSize float64) *contourLine {
 	return &contourLine{
-		lineNum: lineNum,
+		lineNum:  lineNum,
+		lineSize: lineSize,
 	}
 }
 
@@ -35,7 +38,7 @@ func (cl *contourLine) Generative(c *generativeart.Canva) {
 			y += math.Sin(theta) * 0.4
 
 			ctex.SetColor(cls)
-			ctex.DrawEllipse(x, y, 2, 2)
+			ctex.DrawEllipse(x, y, cl.lineSize, cl.lineSize)
 			ctex.Fill()
 
 			if x > float64(c.Width()) || x < 0 || y > float64(c.Height()) || y < 0 || rand.Float64() < 0.001 {