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cpp_compliance_shape_cast_test.go
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cpp_compliance_shape_cast_test.go
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package box2d_test
import (
"fmt"
"github.com/Alexander-r/box2d"
"github.com/pmezard/go-difflib/difflib"
"testing"
)
var expectedShapeCast string = "hit = false, iters = 3, lambda = 1, distance = 7.040063920164362"
func TestCPPComplianceShapeCast(t *testing.T) {
transformA := box2d.MakeB2Transform()
transformA.P = box2d.MakeB2Vec2(0.0, 0.25)
transformA.Q.SetIdentity()
transformB := box2d.MakeB2Transform()
transformB.SetIdentity()
input := box2d.MakeB2ShapeCastInput()
pA := box2d.MakeB2DistanceProxy()
pA.M_vertices = append(pA.M_vertices, box2d.MakeB2Vec2(-0.5, 1.0))
pA.M_vertices = append(pA.M_vertices, box2d.MakeB2Vec2(0.5, 1.0))
pA.M_vertices = append(pA.M_vertices, box2d.MakeB2Vec2(0.0, 0.0))
pA.M_count = 3
pA.M_radius = box2d.B2_polygonRadius
pB := box2d.MakeB2DistanceProxy()
pB.M_vertices = append(pB.M_vertices, box2d.MakeB2Vec2(-0.5, -0.5))
pB.M_vertices = append(pB.M_vertices, box2d.MakeB2Vec2(0.5, -0.5))
pB.M_vertices = append(pB.M_vertices, box2d.MakeB2Vec2(0.5, 0.5))
pB.M_vertices = append(pB.M_vertices, box2d.MakeB2Vec2(-0.5, 0.5))
pB.M_count = 4
pB.M_radius = box2d.B2_polygonRadius
input.ProxyA = pA
input.ProxyB = pB
input.TransformA = transformA
input.TransformB = transformB
input.TranslationB.Set(8.0, 0.0)
output := box2d.MakeB2ShapeCastOutput()
hit := box2d.B2ShapeCast(&output, &input)
transformB2 := box2d.MakeB2Transform()
transformB2.Q = transformB.Q
transformB2.P = box2d.B2Vec2Add(transformB.P, box2d.B2Vec2MulScalar(output.Lambda, input.TranslationB))
distanceInput := box2d.MakeB2DistanceInput()
distanceInput.ProxyA = pA
distanceInput.ProxyB = pB
distanceInput.TransformA = transformA
distanceInput.TransformB = transformB2
distanceInput.UseRadii = false
simplexCache := box2d.MakeB2SimplexCache()
simplexCache.Count = 0
distanceOutput := box2d.MakeB2DistanceOutput()
box2d.B2Distance(&distanceOutput, &simplexCache, &distanceInput)
msg := fmt.Sprintf("hit = %v, iters = %v, lambda = %v, distance = %.15f",
hit, output.Iterations, output.Lambda, distanceOutput.Distance)
fmt.Println(msg)
if msg != expectedShapeCast {
diff := difflib.UnifiedDiff{
A: difflib.SplitLines(expectedShapeCast),
B: difflib.SplitLines(msg),
FromFile: "Expected",
ToFile: "Current",
Context: 0,
}
text, _ := difflib.GetUnifiedDiffString(diff)
t.Fatalf("NOT Matching c++ reference. Failure: \n%s", text)
}
}
var expectedShapeCast2 string = "hit = false, iters = 0, lambda = 1, distance = 8.003905296791061"
func TestCPPComplianceShapeCast2(t *testing.T) {
transformA := box2d.MakeB2Transform()
transformA.P = box2d.MakeB2Vec2(0.0, 0.25)
transformA.Q.SetIdentity()
transformB := box2d.MakeB2Transform()
transformB.SetIdentity()
input := box2d.MakeB2ShapeCastInput()
pA := box2d.MakeB2DistanceProxy()
pA.M_vertices = append(pA.M_vertices, box2d.MakeB2Vec2(0.0, 0.0))
pA.M_count = 1
pA.M_radius = 0.5
pB := box2d.MakeB2DistanceProxy()
pB.M_vertices = append(pB.M_vertices, box2d.MakeB2Vec2(0.0, 0.0))
pB.M_count = 1
pB.M_radius = 0.5
input.ProxyA = pA
input.ProxyB = pB
input.TransformA = transformA
input.TransformB = transformB
input.TranslationB.Set(8.0, 0.0)
output := box2d.MakeB2ShapeCastOutput()
hit := box2d.B2ShapeCast(&output, &input)
transformB2 := box2d.MakeB2Transform()
transformB2.Q = transformB.Q
transformB2.P = box2d.B2Vec2Add(transformB.P, box2d.B2Vec2MulScalar(output.Lambda, input.TranslationB))
distanceInput := box2d.MakeB2DistanceInput()
distanceInput.ProxyA = pA
distanceInput.ProxyB = pB
distanceInput.TransformA = transformA
distanceInput.TransformB = transformB2
distanceInput.UseRadii = false
simplexCache := box2d.MakeB2SimplexCache()
simplexCache.Count = 0
distanceOutput := box2d.MakeB2DistanceOutput()
box2d.B2Distance(&distanceOutput, &simplexCache, &distanceInput)
msg := fmt.Sprintf("hit = %v, iters = %v, lambda = %v, distance = %.15f",
hit, output.Iterations, output.Lambda, distanceOutput.Distance)
fmt.Println(msg)
if msg != expectedShapeCast2 {
diff := difflib.UnifiedDiff{
A: difflib.SplitLines(expectedShapeCast2),
B: difflib.SplitLines(msg),
FromFile: "Expected",
ToFile: "Current",
Context: 0,
}
text, _ := difflib.GetUnifiedDiffString(diff)
t.Fatalf("NOT Matching c++ reference. Failure: \n%s", text)
}
}