Cursor.cpp
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Cursor.cpp
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	#include <echo/GUI/Element.h>
	#include <echo/GUI/Cursor.h>
	#include <echo/Graphics/Renderer.h>
	#include <echo/Maths/Ray.h>

	namespace Echo
	{
	namespace GUI
	{
	Cursor::Cursor(shared_ptr< Input<bool> > button,
	shared_ptr< Input<f32> > xInput,
	shared_ptr< Input<f32> > yInput,
	shared_ptr<Element> rootElement,
	shared_ptr<Renderer> renderer,
	shared_ptr<Element> cursorElement) :
	mButton(button),
	mX(xInput),
	mY(yInput),
	mRootElement(rootElement),
	mCursorElement(cursorElement),
	mRenderer(renderer)
	{
	}

	bool Cursor::OnStart()
	{
	//Prevent starting this task if we have any null required parameters.
	return (mRenderer && mRootElement && mButton && mX && mY);
	}

	void Cursor::Update(Seconds)
	{
	Ray rayIntoScene;
	if(mRenderer->GetRayIntoScene(mX,mY,rayIntoScene))
	{
	Plane plane(Vector3::UNIT_Z,0.f);
	std::pair<bool, f32> intersectResult = rayIntoScene.Intersects(plane);
	if(intersectResult.first)
	{
	Vector3 positionInSpace = rayIntoScene.GetPoint(intersectResult.second);
	if(mCursorElement)
	{
	positionInSpace.z=mCursorElement->GetPosition().z;
	mCursorElement->SetPosition(positionInSpace);
	}
	mRootElement->UpdateCursor(positionInSpace.x,positionInSpace.y,*mButton);
	}
	}
	}
	}
	}