//----------------------------------------------------------------//
ZLRect MOAIQuadBrush::GetVtxBounds () {
ZLRect rect;
rect.Init ( this->mModelQuad.mV [ 0 ]);
rect.Grow ( this->mModelQuad.mV [ 1 ]);
rect.Grow ( this->mModelQuad.mV [ 2 ]);
rect.Grow ( this->mModelQuad.mV [ 3 ]);
return rect;
}
//----------------------------------------------------------------//
bool ZLFrustum::GetXYSectRect ( const ZLAffine3D& mtx, ZLRect& rect ) const {
u32 nHits = 0;
ZLVec2D hits [ 12 ];
ZLVec3D nlt = this->mPoints [ NEAR_LT_POINT ];
ZLVec3D nrt = this->mPoints [ NEAR_RT_POINT ];
ZLVec3D nrb = this->mPoints [ NEAR_RB_POINT ];
ZLVec3D nlb = this->mPoints [ NEAR_LB_POINT ];
ZLVec3D flt = this->mPoints [ FAR_LT_POINT ];
ZLVec3D frt = this->mPoints [ FAR_RT_POINT ];
ZLVec3D frb = this->mPoints [ FAR_RB_POINT ];
ZLVec3D flb = this->mPoints [ FAR_LB_POINT ];
mtx.Transform ( nlt );
mtx.Transform ( nrt );
mtx.Transform ( nrb );
mtx.Transform ( nlb );
mtx.Transform ( flt );
mtx.Transform ( frt );
mtx.Transform ( frb );
mtx.Transform ( flb );
if ( _vecToXYPlane ( nlt, flt, hits [ nHits ])) ++nHits;
if ( _vecToXYPlane ( nrt, frt, hits [ nHits ])) ++nHits;
if ( _vecToXYPlane ( nrb, frb, hits [ nHits ])) ++nHits;
if ( _vecToXYPlane ( nlb, flb, hits [ nHits ])) ++nHits;
if ( _vecToXYPlane ( nlt, nrt, hits [ nHits ])) ++nHits;
if ( _vecToXYPlane ( nrt, nrb, hits [ nHits ])) ++nHits;
if ( _vecToXYPlane ( nrb, nlb, hits [ nHits ])) ++nHits;
if ( _vecToXYPlane ( nlb, nlt, hits [ nHits ])) ++nHits;
if ( _vecToXYPlane ( flt, frt, hits [ nHits ])) ++nHits;
if ( _vecToXYPlane ( frt, frb, hits [ nHits ])) ++nHits;
if ( _vecToXYPlane ( frb, flb, hits [ nHits ])) ++nHits;
if ( _vecToXYPlane ( flb, flt, hits [ nHits ])) ++nHits;
if ( nHits ) {
rect.Init ( hits [ 0 ]);
for ( u32 i = 1; i < nHits; ++i ) {
rect.Grow ( hits [ i ]);
}
return true;
}
return false;
}
//----------------------------------------------------------------//
ZLRect MOAIScissorRect::GetScissorRect ( const ZLMatrix4x4& worldToWndMtx ) const {
ZLVec3D vtx3D [ 4 ];
vtx3D [ 0 ].mX = this->mRect.mXMin;
vtx3D [ 0 ].mY = this->mRect.mYMin;
vtx3D [ 0 ].mZ = 0.0f;
vtx3D [ 1 ].mX = this->mRect.mXMin;
vtx3D [ 1 ].mY = this->mRect.mYMax;
vtx3D [ 1 ].mZ = 0.0f;
vtx3D [ 2 ].mX = this->mRect.mXMax;
vtx3D [ 2 ].mY = this->mRect.mYMax;
vtx3D [ 2 ].mZ = 0.0f;
vtx3D [ 3 ].mX = this->mRect.mXMax;
vtx3D [ 3 ].mY = this->mRect.mYMin;
vtx3D [ 3 ].mZ = 0.0f;
ZLMatrix4x4 mtx;
mtx.Init ( this->GetLocalToWorldMtx ());
mtx.Append ( worldToWndMtx );
mtx.Project ( vtx3D [ 0 ]);
mtx.Project ( vtx3D [ 1 ]);
mtx.Project ( vtx3D [ 2 ]);
mtx.Project ( vtx3D [ 3 ]);
ZLRect scissorRect;
scissorRect.Init ( vtx3D [ 0 ]);
scissorRect.Grow ( vtx3D [ 1 ]);
scissorRect.Grow ( vtx3D [ 2 ]);
scissorRect.Grow ( vtx3D [ 3 ]);
if ( this->mScissorRect ) {
ZLRect parentRect = this->mScissorRect->GetScissorRect ( worldToWndMtx );
parentRect.Clip ( scissorRect );
}
return scissorRect;
}
//----------------------------------------------------------------//
void MOAIDraw::DrawRay ( float x, float y, float dx, float dy ) {
USVec2D loc ( x, y );
USVec2D vec ( dx, dy );
ZLMatrix4x4 mtx = MOAIGfxDevice::Get ().GetViewProjMtx ();
ZLMatrix4x4 invMtx;
invMtx.Inverse ( mtx );
mtx.Transform ( loc );
mtx.TransformVec ( vec );
ZLRect viewRect;
viewRect.Init ( -1.0f, -1.0f, 1.0f, 1.0f );
USVec2D p0;
USVec2D p1;
if ( viewRect.GetIntersection ( loc, vec, p0, p1 )) {
invMtx.Transform ( p0 );
invMtx.Transform ( p1 );
MOAIGfxDevice& gfxDevice = MOAIGfxDevice::Get ();
gfxDevice.BeginPrim ( ZGL_PRIM_LINES );
gfxDevice.WriteVtx ( p0.mX, p0.mY, 0.0f );
gfxDevice.WriteFinalColor4b ();
gfxDevice.WriteVtx ( p1.mX, p1.mY, 0.0f );
gfxDevice.WriteFinalColor4b ();
gfxDevice.EndPrim ();
}
}
//----------------------------------------------------------------//
void MOAIDraw::DrawAxisGrid ( USVec2D loc, USVec2D vec, float size ) {
ZLMatrix4x4 mtx = MOAIGfxDevice::Get ().GetViewProjMtx ();
ZLMatrix4x4 invMtx;
invMtx.Inverse ( mtx );
// Set the axis to the grid length so we can get the length back post-transform
vec.SetLength ( size );
mtx.Transform ( loc );
mtx.TransformVec ( vec );
// Get the axis unit vector
USVec2D norm = vec;
size = norm.NormSafe ();
// Get the axis normal
USVec2D perpNorm ( norm.mY, -norm.mX );
// Project the corners of the viewport onto the axis to get the mix/max bounds
float dot;
float min;
float max;
USVec2D corner;
// left, top
corner.Init ( -1.0f, 1.0f );
corner.Sub ( loc );
dot = norm.Dot ( corner );
min = dot;
max = dot;
// right, top
corner.Init ( 1.0f, 1.0f );
corner.Sub ( loc );
dot = norm.Dot ( corner );
min = ( dot < min ) ? dot : min;
max = ( dot > max ) ? dot : max;
// right, bottom
corner.Init ( 1.0f, -1.0f );
corner.Sub ( loc );
dot = norm.Dot ( corner );
min = ( dot < min ) ? dot : min;
max = ( dot > max ) ? dot : max;
// left, bottom
corner.Init ( -1.0f, -1.0f );
corner.Sub ( loc );
dot = norm.Dot ( corner );
min = ( dot < min ) ? dot : min;
max = ( dot > max ) ? dot : max;
// Get the start andstop grids
s32 start = ( s32 )( min / size ) - 1;
s32 stop = ( s32 )( max / size ) + 1;
// Set the pen to the first...
USVec2D pen = norm;
pen.Scale (( float )start * size );
pen.Add ( loc );
// Step along the axis to draw perpendicular grid lines
ZLRect viewRect;
viewRect.Init ( -1.0f, -1.0f, 1.0f, 1.0f );
for ( ; start < stop; ++start ) {
USVec2D p0;
USVec2D p1;
if ( viewRect.GetIntersection ( pen, perpNorm, p0, p1 )) {
invMtx.Transform ( p0 );
invMtx.Transform ( p1 );
MOAIDraw::DrawLine ( p0, p1 );
}
pen.Add ( vec );
}
}
