Method Update

examples/TEST_Camera2D.cpp:194–245

Update camera, animating if necessary, obeying world boundary rules returns true if target is visible

		// Update camera, animating if necessary, obeying world boundary rules
		// returns true if target is visible
		inline virtual bool Update(const float fElapsedTime)
		{
			switch (m_nMode)
			{
			case Mode::Simple:
			{
				m_vPosition = GetTarget();
			}
			break;

			case Mode::EdgeMove:
			{
				olc::vf2d vOverlap = GetTarget() - m_vPosition;
				if (vOverlap.x > m_vEdgeTriggerDistance.x) m_vPosition.x += vOverlap.x - m_vEdgeTriggerDistance.x;
				if (vOverlap.x < -m_vEdgeTriggerDistance.x) m_vPosition.x += vOverlap.x + m_vEdgeTriggerDistance.x;
				if (vOverlap.y > m_vEdgeTriggerDistance.y) m_vPosition.y += vOverlap.y - m_vEdgeTriggerDistance.y;
				if (vOverlap.y < -m_vEdgeTriggerDistance.y) m_vPosition.y += vOverlap.y + m_vEdgeTriggerDistance.y;
			}
			break;

			case Mode::LazyFollow:
			{
				m_vPosition += (GetTarget() - m_vPosition) * m_fLazyFollowRate * fElapsedTime;
			}
			break;

			case Mode::FixedScreens:
			{
				m_vPosition = olc::vf2d(olc::vi2d(GetTarget() / m_vScreenSize) * olc::vi2d(m_vScreenSize)) + (m_vViewSize * 0.5f);
			}
			break;

			case Mode::SlideScreens:
			{
				olc::vf2d vScreen = olc::vf2d(olc::vi2d(GetTarget() / m_vScreenSize) * olc::vi2d(m_vScreenSize)) + (m_vViewSize * 0.5f);
				m_vPosition += (vScreen - m_vPosition) * m_fLazyFollowRate * 2.0f * fElapsedTime;
			}
			break;
			}

			// Make camera target the middle of the view
			m_vViewPos = m_vPosition - (m_vViewSize * 0.5f);

			// Clamp to World Boundary (if in place)
			if (m_bWorldBoundary)
			{
				m_vViewPos = m_vViewPos.max(m_vWorldBoundaryPos).min(m_vWorldBoundaryPos + m_vWorldBoundarySize - m_vViewSize);
			}

			return GetTarget().x >= m_vViewPos.x && GetTarget().x < (m_vViewPos.x + m_vViewSize.x) &&
				GetTarget().y >= m_vViewPos.y && GetTarget().y < (m_vViewPos.y + m_vViewSize.y);
		}

	protected:
		// Position of camera focus point in the world