add splinetester

geom/cmd/splinetester.go

@@ -0,0 +1,37 @@
+//go:build example
+// +build example
+
+package main
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/DrJosh9000/ichigo/geom"
+)
+
+func main() {
+	// Put your own points here!
+	points := []geom.Float2{
+		{X: -7, Y: -2},
+		{X: -5, Y: 1},
+		{X: -3, Y: 0},
+		{X: -2, Y: -3},
+		{X: 0, Y: 2},
+		{X: 1, Y: -5},
+		{X: 3, Y: -2},
+		{X: 4, Y: 4},
+	}
+	linear := &geom.LinearSpline{Points: points}
+	if err := linear.Prepare(); err != nil {
+		log.Fatalf("linear.Prepare() = %v, want nil", err)
+	}
+	cubic := &geom.CubicSpline{Points: points}
+	if err := cubic.Prepare(); err != nil {
+		log.Fatalf("cubic.Prepare() = %v, want nil", err)
+	}
+	// Produce interpolated points in CSV-like form.
+	for x := -8.0; x < 8.0; x += 0.1 {
+		fmt.Printf("%f,%f,%f\n", x, linear.Interpolate(x), cubic.Interpolate(x))
+	}
+}