/**
* Get the rotations that would make a (0,0,1) direction vector point in the same direction as this direction vector.
* Useful for orienting vector towards a point.
*
* Returns a rotation vector containing the X (pitch) and Y (raw) rotations (in degrees) that when applied to a
* +Z (e.g. 0, 0, 1) direction vector would make it point in the same direction as this vector. The Z (roll) rotation
* is always 0, since two Euler rotations are sufficient to point in any given direction.
*
* Code ported from Irrlicht: http://irrlicht.sourceforge.net/
*/
kmVec3* kmVec3GetHorizontalAngle(kmVec3* pOut, const kmVec3 *pIn) {
const kmScalar z1 = sqrt(pIn->x * pIn->x + pIn->z * pIn->z);
pOut->y = kmRadiansToDegrees(atan2(pIn->x, pIn->z));
if (pOut->y < 0)
pOut->y += 360;
if (pOut->y >= 360)
pOut->y -= 360;
pOut->x = kmRadiansToDegrees(atan2(z1, pIn->y)) - 90.0;
if (pOut->x < 0)
pOut->x += 360;
if (pOut->x >= 360)
pOut->x -= 360;
return pOut;
}
void cxViewReadAttr(cxReaderAttrInfo *info)
{
cxObjectReadAttr(info);
cxView this = info->object;
//fixscale
cxViewSetFixScale(this, cxXMLReadVec2fAttr(info, "cxView.fixScale", this->fixscale));
//rect
cxViewRootReadRectToView(info);
//resize
cxViewRootReadAutoResize(info);
//cropping
cxViewSetCropping(this,cxXMLReadBoolAttr(info, "cxView.cropping", this->isCropping));
//top
cxViewSetTop(this, cxXMLReadBoolAttr(info, "cxView.hideTop", this->hideTop));
//anchor
cxViewSetAnchor(this, cxXMLReadVec2fAttr(info, "cxView.anchor", this->anchor));
//scale
cxViewSetScale(this, cxXMLReadVec2fAttr(info, "cxView.scale", this->scale));
//color
cxColor4f color = cxXMLReadColor4fAttr(info, "cxView.color", this->color);
cxViewSetColor(this, cxColor3fv(color.r, color.g, color.b));
cxViewSetAlpha(this, cxXMLReadFloatAttr(info, "cxView.alpha", color.a));
//visible
cxViewSetVisible(this, cxXMLReadBoolAttr(info, "cxView.visible", this->isVisible));
//debug border
cxViewSetBorder(this, cxXMLReadBoolAttr(info, "cxView.border", this->isBorder));
//rotate raxis
cxViewSetRaxis(this, cxXMLReadVec3fAttr(info, "cxView.raxis", this->raxis));
//rotate angle
cxViewSetAngle(this, cxXMLReadFloatAttr(info, "cxView.angle", this->angle));
//rotate degress
cxViewSetDegrees(this, cxXMLReadFloatAttr(info, "cxView.degrees", kmRadiansToDegrees(this->angle)));
//Chipmunk support
cxViewCheckChipmunkSupport(info);
//cxAtlas support
this->supportAtlasSet = cxXMLReadBoolAttr(info, "cxAtlasSet.support", false);
//view event
cxXMLAppendEvent(info, this, cxView, onEnter);
cxXMLAppendEvent(info, this, cxView, onExit);
cxXMLAppendEvent(info, this, cxView, onUpdate);
cxXMLAppendEvent(info, this, cxView, onResize);
cxXMLAppendEvent(info, this, cxView, onLayout);
cxXMLAppendEvent(info, this, cxView, onDirty);
}
/**
* Returns the angle in degrees between the two vectors
*/
kmScalar kmVec2DegreesBetween(const kmVec2* v1, const kmVec2* v2) {
if(kmVec2AreEqual(v1, v2)) {
return 0.0;
}
kmVec2 t1, t2;
kmVec2Normalize(&t1, v1);
kmVec2Normalize(&t2, v2);
kmScalar cross = kmVec2Cross(&t1, &t2);
kmScalar dot = kmVec2Dot(&t1, &t2);
/*
* acos is only defined for -1 to 1. Outside the range we
* get NaN even if that's just because of a floating point error
* so we clamp to the -1 - 1 range
*/
if(dot > 1.0) dot = 1.0;
if(dot < -1.0) dot = -1.0;
return kmRadiansToDegrees(atan2(cross, dot));
}
Degrees to_degrees(const Radians& radians) {
return Degrees(kmRadiansToDegrees(radians.value_));
}
Degrees::Degrees(const Radians &rhs) {
value_ = kmRadiansToDegrees(rhs.value_);
}
