## ~zjm/Moon3D

ref: 0fe31db4998f636b8f65ca790b75c0585ba47d86 Moon3D/test/project.test.c -rw-r--r-- 2.9 KiB
0fe31db4Zack Michener refactor camera/projection to avoid globals 5 months ago
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```#include "tests.h"
#include <math.h>

void ProjectionTests(void)
{
DoTest(&TestPerspectiveProjection);
DoTest(&TestViewmapPolygon);
DoTest(&TestCameraPosition);
}

void TestPerspectiveProjection(void)
{
Projection *projection = NewPerspectiveProjection(90, 1, 1, 2);
Camera *camera = NewCamera(V(0, 0, 0));
Transform t = GetProjectionTransform(camera, projection);

Transform ct = CameraTransform(camera);
AssertTrue(IsIdentity(ct));

Vertex p = V(0, 1, -1);
Vertex q = Homogenize(ProjectPoint(p, t));
AssertTrue(VertexEqual(q, V(0, 1, 1)));

p = V(0, -1, -1);
q = Homogenize(ProjectPoint(p, t));
AssertTrue(VertexEqual(q, V(0, -1, 1)));

p = V(0, 2, -2);
q = Homogenize(ProjectPoint(p, t));
AssertTrue(VertexEqual(q, V(0, 1, -1)));

p = V(0, -2, -2);
q = Homogenize(ProjectPoint(p, t));
AssertTrue(VertexEqual(q, V(0, -1, -1)));
}

void TestViewmapPolygon(void)
{
InitDeviceTransform(400, 240);
Polygon *p = NewPolygon();

ViewmapPolygon(p);
for (int i = 0; i < NumVertices(p); i++) {
Vertex *v = PolygonVertex(p, i);
AssertTrue(v->x >= 0);
AssertTrue(v->x < 400);
AssertTrue(v->y >= 0);
AssertTrue(v->y < 240);
}
FreePolygon(p);

p = NewPolygon();

ViewmapPolygon(p);
for (int i = 0; i < NumVertices(p); i++) {
Vertex *v = PolygonVertex(p, i);
AssertTrue(v->x >= 0);
AssertTrue(v->x < 400);
AssertTrue(v->y >= 0);
AssertTrue(v->y < 240);
}
FreePolygon(p);

p = NewPolygon();
ClipPolygon(&p);
HomogenizePolygon(p);
ViewmapPolygon(p);
for (int i = 0; i < NumVertices(p); i++) {
Vertex *v = PolygonVertex(p, i);
AssertTrue(v->x >= 0);
AssertTrue(v->x < 400);
AssertTrue(v->y >= 0);
AssertTrue(v->y < 240);
}
FreePolygon(p);
}

void TestCameraPosition(void)
{
Camera *camera = NewCamera(V(10, 20, -3));
Vector p = camera->position;
AssertEqual(p.x, 10);
AssertEqual(p.y, 20);
AssertEqual(p.z, -3);

MoveCamera(V(1, 1, 1), camera);
p = camera->position;
AssertEqual(p.x, 11);
AssertEqual(p.y, 21);
AssertEqual(p.z, -2);

RotateCamera(0, 130, 0, camera);
p = camera->position;
AssertEqual(p.x, 11);
AssertEqual(p.y, 21);
AssertEqual(p.z, -2);
}
```