void testAreaShader()
{
Mercator::Area* a1 = new Mercator::Area(1, false);
WFMath::Polygon<2> p;
p.addCorner(p.numCorners(), Point2(3, 4));
p.addCorner(p.numCorners(), Point2(10, 10));
p.addCorner(p.numCorners(), Point2(14, 6));
p.addCorner(p.numCorners(), Point2(18, 4));
p.addCorner(p.numCorners(), Point2(17, 19));
p.addCorner(p.numCorners(), Point2(6, 20));
p.addCorner(p.numCorners(), Point2(-1, 18));
p.addCorner(p.numCorners(), Point2(-8, 11));
a1->setShape(p);
Mercator::Area* a2 = new Mercator::Area(1, false);
WFMath::Polygon<2> p2;
p2.addCorner(p2.numCorners(), Point2(25, 18));
p2.addCorner(p2.numCorners(), Point2(72, 22));
p2.addCorner(p2.numCorners(), Point2(60, 30));
p2.addCorner(p2.numCorners(), Point2(27, 28));
p2.addCorner(p2.numCorners(), Point2(25, 45));
p2.addCorner(p2.numCorners(), Point2(3, 41));
p2.addCorner(p2.numCorners(), Point2(-2, 20));
a2->setShape(p2);
Mercator::Terrain terrain(Mercator::Terrain::SHADED, 16);
Mercator::Shader * base_shader =
new Mercator::FillShader(Mercator::Shader::Parameters());
terrain.addShader(base_shader, 0);
Mercator::AreaShader* ashade = new Mercator::AreaShader(1);
terrain.addShader(ashade, 1);
terrain.setBasePoint(0, 0, -1);
terrain.setBasePoint(0, 1, 8);
terrain.setBasePoint(1, 0, 2);
terrain.setBasePoint(1, 1, 11);
terrain.setBasePoint(2, 0, 2);
terrain.setBasePoint(2, 1, 11);
terrain.addArea(a1);
// terrain.addArea(a2);
Mercator::Segment* seg = terrain.getSegment(0,0);
assert(a1->checkIntersects(*seg));
seg->populateSurfaces();
writePGMForSurface("test1.pgm", seg->getSize(), seg->getSurfaces()[1]);
seg = terrain.getSegment(1,0);
seg->populateSurfaces();
writePGMForSurface("test2.pgm", seg->getSize(), seg->getSurfaces()[1]);
}
int main()
{
Mercator::Terrain t;
// Add a null test shader to the terrain
Mercator::Shader * shader = new TestShader;
t.addShader(shader, 0);
// Create a test area with a shape which intersects
// the Segment at 0,0
Mercator::Area* a1 = new Mercator::Area(0, false);
WFMath::Polygon<2> p;
p.addCorner(p.numCorners(), WFMath::Point<2>(3, 4));
p.addCorner(p.numCorners(), WFMath::Point<2>(10, 10));
p.addCorner(p.numCorners(), WFMath::Point<2>(14, 6));
p.addCorner(p.numCorners(), WFMath::Point<2>(18, 4));
p.addCorner(p.numCorners(), WFMath::Point<2>(17, 19));
p.addCorner(p.numCorners(), WFMath::Point<2>(6, 20));
p.addCorner(p.numCorners(), WFMath::Point<2>(-1, 18));
p.addCorner(p.numCorners(), WFMath::Point<2>(-8, 11));
a1->setShape(p);
// Add enough base points to force the creation of the Segment at 0,0
t.setBasePoint(0, 0, -1);
t.setBasePoint(0, 1, 8);
t.setBasePoint(1, 0, 2);
t.setBasePoint(1, 1, 11);
// Get the Segment at 0,0
Mercator::Segment * seg = t.getSegmentAtIndex(0,0);
assert(seg != 0);
// Get the surfaces, and add one corresponding to the shader we added.
// We need to do this as the functions that would normally make it happen
// have been stubbed out.
Mercator::Segment::Surfacestore & sss = seg->getSurfaces();
Mercator::Surface * sfce = new Mercator::Surface(*seg, *shader);
// Force allocation of the surface buffer so we can check later that it
// gets destroyed when the area is added to the terrain.
sfce->allocate();
assert(sfce->isValid());
// Add the surface to the store for this segment
sss[0] = sfce;
// Add the area which should cause relevant surface date to be invalidated
t.addArea(a1);
// We assert this to ensure that the buffer has been de-allocated
// by a call to Surface::invalidate caused by adding the Area.
assert(!sfce->isValid());
// force the surface to re-allocate
sfce->allocate();
assert(sfce->isValid());
// Modify the areas shape
p.addCorner(p.numCorners(), WFMath::Point<2>(-9, 12));
a1->setShape(p);
// and cause an area update
t.updateArea(a1);
// Check the surface has been invalidated again
assert(!sfce->isValid());
// force the surface to re-allocate
sfce->allocate();
assert(sfce->isValid());
t.removeArea(a1);
// Check the surface has been invalidated again
assert(!sfce->isValid());
}