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// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package clock
import "testing"
func TestLinear(t *testing.T) {
t0 := Time(0)
t1 := Time(6 * 60)
now := Time(3 * 60)
if c := Linear(t0, t1, now); c != 0.5 {
t.Errorf("c=%.2f, want 0.5", c)
}
}
func TestCubicBezier(t *testing.T) {
t0 := Time(0)
t1 := Time(1e6)
tests := []struct {
x0, y0, x1, y1 float32
x, y float32
}{
{0.00, 0.1, 0.4, 1.00, 0.0, 0.00},
{0.00, 0.1, 0.4, 1.00, 0.1, 0.26},
{0.00, 0.1, 0.4, 1.00, 0.5, 0.79},
{0.00, 0.1, 0.4, 1.00, 0.9, 0.99},
{0.00, 0.1, 0.4, 1.00, 1.0, 1.00},
{0.36, 0.2, 0.3, 0.85, 0.0, 0.0},
{0.36, 0.2, 0.3, 0.85, 0.3059, 0.3952},
{0.36, 0.2, 0.3, 0.85, 0.4493, 0.6408},
{0.36, 0.2, 0.3, 0.85, 0.8116, 0.9410},
{0.00, 0.0, 1.0, 1.00, 0.1, 0.1},
{0.00, 0.0, 1.0, 1.00, 0.5, 0.5},
{0.00, 0.0, 1.0, 1.00, 0.9, 0.9},
{0.42, 0.0, 1.0, 1.00, 0.0, 0.0},
}
for _, test := range tests {
cb := CubicBezier(test.x0, test.y0, test.x1, test.y1)
now := t0 + Time(float32(t1-t0)*test.x)
y := cb(t0, t1, now)
const epsilon = 0.01
diff := y - test.y
if diff < -epsilon || +epsilon < diff {
t.Errorf("CubicBezier(%.2f,%.2f,%.2f,%.2f): for x=%.2f got y=%.2f, want %.2f", test.x0, test.y0, test.x1, test.y1, test.x, y, test.y)
}
}
}
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