CGate Class Reference

A gate. More...

#include <Gate.h>

Inheritance diagram for CGate:

Collaboration diagram for CGate:

Public Member Functions
	CGate (Shapes::CLineSeg *)
	Constructor.
	~CGate ()
	Destructor.
bool	NarrowPhase (Shapes::CDynamicCircle *)
	Narrow phase.

Private Attributes
Shapes::CLineSeg *	m_pLineSeg = nullptr
	Pointer to line segment.

Additional Inherited Members
Static Protected Attributes inherited from CCommon
static Sage::CSpriteRenderer *	m_pRenderer = nullptr
	Pointer to the renderer.
static CObjectManager *	m_pObjectManager = nullptr
	Pointer to the object manager.
static UINT	m_nMIterations = 4
	Number of motion iterations.
static UINT	m_nCIterations = 1
	Number of collision iterations.
static float	m_fFrequency = 60.0f*m_nMIterations
	Frequency, number of physics iterations per second.
static eDrawMode	m_eDrawMode = eDrawMode::Background
	Draw mode.
static bool	m_bBallInPlay = false
	Is there a ball currently in play?
static UINT	m_nScore = 0
	Current score.

Detailed Description

A gate allows circles to cross in one direction only. It's essentially a line segment with some code that handles the crossing-in-one-direction requirement. More specifically, if the circle's velocity is in the opposite direction to the line segment's normal vector CLineSeg::m_vNormal and the circle's speed is larger than some threshold, then the circle passes through. Otherwise it bounces off of the line segment. Recall that the direction of CLineSeg::m_vNormal depends on the order in which CLineSeg's end points were specified, so make sure you get it right.

Constructor & Destructor Documentation

CGate()

CGate::CGate

(

Shapes::CLineSeg *

p

)

Construct a closed and unlatched gate from a line segment.

Parameters

p	Pointer to a line segment.

Member Function Documentation

NarrowPhase()

bool CGate::NarrowPhase

(

Shapes::CDynamicCircle *

p

)

If a dynamic circle collides with a gate and it is moving in the correct direction and is fast enough, then the gate opens and the dynamic circle is allowed through. Otherwise the dynamic circle bounces off the gate as usual.

Parameters

p	Pointer to a dynamic circle.

Returns

true if the dynamic circle intersects the gate.

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