54 lines
1.1 KiB
Go
54 lines
1.1 KiB
Go
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package physics_test
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import (
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"testing"
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"git.kirsle.net/apps/doodle/pkg/physics"
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"git.kirsle.net/go/render"
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)
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// Test converting points to vectors and back again.
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func TestVectorPoint(t *testing.T) {
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var tests = []struct {
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In render.Point
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Mid physics.Vector
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Add physics.Vector
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Out render.Point
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}{
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{
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In: render.NewPoint(102, 102),
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Mid: physics.NewVector(102.0, 102.0),
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Out: render.NewPoint(102, 102),
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},
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{
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In: render.NewPoint(64, 128),
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Mid: physics.NewVector(64.0, 128.0),
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Add: physics.NewVector(0.4, 0.6),
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Out: render.NewPoint(64, 129),
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},
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}
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for _, test := range tests {
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// Convert point to vector.
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v := physics.VectorFromPoint(test.In)
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if v != test.Mid {
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t.Errorf("Unexpected Vector from Point(%s): wanted %s, got %s",
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test.In, test.Mid, v,
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)
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continue
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}
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// Add other vector.
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v.Add(test.Add)
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// Verify output point rounded down correctly.
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out := v.ToPoint()
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if out != test.Out {
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t.Errorf("Unexpected output vector from Point(%s) -> V(%s) + V(%s): wanted %s, got %s",
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test.In, test.Mid, test.Add, test.Out, out,
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)
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continue
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}
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}
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}
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