int Map:: BuildTransform() {
world_ = XMMatrixTransformation2D(XMLoadFloat2(&XMFLOAT2(0,0)),
0,
XMLoadFloat2(&XMFLOAT2(scale_,scale_)),
XMLoadFloat2(&XMFLOAT2(0,0)),
angle_,
XMLoadFloat2(&XMFLOAT2(x_,y_)));
world_._43 = z_;
return S_OK;
}
//
// Now that have the spaces in the Broad Collision Zone,
// determine which of those are within the Lookahead Zone.
//
void LookaheadCollisionFilter::Filter(
list<Space *> * pFiltered, // in, out
list<Space *> * pCollided,
float2 fScreenDimensions,
list<float2> * fCollisionZonePixels,
ActionParameter * pActionParameter)
{
float2 vertices[5];
vertices[LEFT_TOP] = *(fCollisionZonePixels->begin());
vertices[RIGHT_TOP] = *(next(fCollisionZonePixels->begin()));
vertices[RIGHT_BOTTOM] = *(next(next(fCollisionZonePixels->begin())));
vertices[LEFT_BOTTOM] = *(next(next(next(fCollisionZonePixels->begin()))));
vertices[4] = *(next(next(next(next(fCollisionZonePixels->begin())))));
// These never change and don't need to be inside the loops.
XMVECTOR vecCollidedVertices[4];
vecCollidedVertices[LEFT_TOP] =
XMVectorSet(
GRID->GetColumnWidth() / -2.0f,
GRID->GetRowHeight() / -2.0f,
0.0f,
0.0f);
vecCollidedVertices[RIGHT_TOP] =
XMVectorSet(
GRID->GetColumnWidth() / 2.0f,
GRID->GetRowHeight() / -2.0f,
0.0f,
0.0f);
vecCollidedVertices[RIGHT_BOTTOM] =
XMVectorSet(
(GRID->GetColumnWidth() / 2.0f),
GRID->GetRowHeight() / 2.0f,
0.0f,
0.0f);
vecCollidedVertices[LEFT_BOTTOM] =
XMVectorSet(
GRID->GetColumnWidth() / -2.0f,
GRID->GetRowHeight() / 2.0f,
0.0f,
0.0f);
// For each line segment of the lookahead zone...
for (int i = 0; i < 4; i++)
{
// Need to determine the line equations
// that make up each side of the lookahead zone.
// Need to consider rotation when determining
// how to calculate slope of each line.
// Check which vertex is on the left.
float2 fPt1 = vertices[i % 4];
float2 fPt2 = vertices[(i + 1) % 4];
LineSegment * currentLookaheadZoneLineSegment =
new LineSegment(fPt1, fPt2);
list<Space *>::const_iterator iteratorSpaces;
// For each of the Spaces in the broad zone,
// determine their vertices.
for (iteratorSpaces = pCollided->begin();
iteratorSpaces != pCollided->end();
iteratorSpaces++)
{
float2 fCollidedCenter = (*iteratorSpaces)->GetLocationRatio();
float fCollidedRotation =
FLOAT((*iteratorSpaces)->GetAttributes()->LookupValue(A_ROTATION));
XMMATRIX translationMatrix =
XMMatrixTransformation2D(
XMVectorSet(
fCollidedCenter.x * fScreenDimensions.x,
fCollidedCenter.y * fScreenDimensions.y,
0.0f,
0.0f),
1.0f,
XMVectorSet(1.0f, 1.0f, 0.0f, 0.0f),
XMVectorSet(
fCollidedCenter.x * fScreenDimensions.x,
fCollidedCenter.y * fScreenDimensions.y,
0.0f,
0.0f),
0.0f,
XMVectorSet(
fCollidedCenter.x * fScreenDimensions.x,
fCollidedCenter.y * fScreenDimensions.y,
0.0f,
0.0f));
XMMATRIX rotationMatrix =
XMMatrixTransformation2D(
XMVectorSet(
fCollidedCenter.x * fScreenDimensions.x,
fCollidedCenter.y * fScreenDimensions.y,
0.0f,
0.0f),
1.0f,
XMVectorSet(1.0f, 1.0f, 0.0f, 0.0f),
XMVectorSet(
fCollidedCenter.x * fScreenDimensions.x,
fCollidedCenter.y * fScreenDimensions.y,
0.0f,
0.0f),
XMConvertToRadians(360.0f - fCollidedRotation),
XMVectorSet(0.0f, 0.0f, 0.0f, 0.0f));
XMVECTOR vecTransform[4];
for (int i = LEFT_TOP; i <= LEFT_BOTTOM; i++)
{
vecTransform[i] = XMVector3Transform(vecCollidedVertices[i], translationMatrix * rotationMatrix);
}
LineSegment lineSegments[4];
// Locations (i.e. LEFT_TOP, etc) are relative due east (0 degrees).
lineSegments[0] =
LineSegment
{
float2 { XMVectorGetX(vecTransform[LEFT_TOP]), XMVectorGetY(vecTransform[LEFT_TOP]) },
float2 { XMVectorGetX(vecTransform[RIGHT_TOP]), XMVectorGetY(vecTransform[RIGHT_TOP]) }
};
lineSegments[1] =
LineSegment
{
float2{ XMVectorGetX(vecTransform[RIGHT_TOP]), XMVectorGetY(vecTransform[RIGHT_TOP]) },
float2{ XMVectorGetX(vecTransform[RIGHT_BOTTOM]), XMVectorGetY(vecTransform[RIGHT_BOTTOM]) }
};
lineSegments[2] =
LineSegment
{
float2{ XMVectorGetX(vecTransform[RIGHT_BOTTOM]), XMVectorGetY(vecTransform[RIGHT_BOTTOM]) },
float2{ XMVectorGetX(vecTransform[LEFT_BOTTOM]), XMVectorGetY(vecTransform[LEFT_BOTTOM]) }
};
lineSegments[3] =
LineSegment
{
float2{ XMVectorGetX(vecTransform[LEFT_BOTTOM]), XMVectorGetY(vecTransform[LEFT_BOTTOM]) },
float2{ XMVectorGetX(vecTransform[LEFT_TOP]), XMVectorGetY(vecTransform[LEFT_TOP]) }
};
for (int i = 0; i <= 3; i++)
{
float fIntersectionX = 0.0f;
float fIntersectionY = 0.0f;
if (Utils::DoLinesIntersect(
*currentLookaheadZoneLineSegment,
lineSegments[i],
&fIntersectionX,
&fIntersectionY))
{
pFiltered->push_back(*iteratorSpaces);
}
}
}
delete currentLookaheadZoneLineSegment;
}
}
