imagewarp.cpp

visual c++数字图像与图形处理中的光盘内容

/////////////////////////////////////////////////////////////////////////////////
//
// ImageWarp.cpp: implementation of the CImageWarp class.
//
////////////////////////////////////////////////////////////////////////////////
// 版权所有(2000)
// Copyright(2000)
// 编写者: 向世明
// Author: Xiang Shiming


#include "stdafx.h"
#include "ImageWarp.h"
#include "math.h"

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
IMPLEMENT_DYNAMIC(CImageWarp, CImageGeneralTransform)
CImageWarp::CImageWarp()
{
	m_dwOperation = IMAGE_GEOMETRY_WARP_X;

	m_fAmplitude = 1.0f;
	m_fPeriod = 0.0f;
	m_fPhase = 0.0f;
	m_fOffset = 0.0f;
}

CImageWarp::~CImageWarp()
{

}

#ifdef _DEBUG
void CImageWarp::Dump(CDumpContext& dc) const
{
	CImageGeneralTransform::Dump(dc);
}

void CImageWarp::AssertValid() const
{
	CImageGeneralTransform::AssertValid();
}
#endif

FLOATPOINT CImageWarp::GetInversePoint(int x,  int y,  int nWidth,  int nHeight)
{
	float fx, fy;

		//将角度转化成弧度
	float fRad = (float)(m_fPhase * PIE / 180.0);

	if(m_dwOperation == IMAGE_GEOMETRY_WARP_X)
	{
		//变换公式:
		//y = y0;
		//x = x0 + m_fAmplitude * sin(y0 * m_fPeriod / 360 + m_fPhase) + m_fOffset

		fRad += (((float)y * (float)m_fPeriod) / 360.0f);
		fy = (float)y;
		fx = (float)x - (m_fAmplitude * (float)sin(fRad) + m_fOffset);
	}
	else if(m_dwOperation == IMAGE_GEOMETRY_WARP_Y)
	{
		//变换公式:
		//x = x0;
		//y = y0 + m_fAmplitude * sin(x0 * m_fPeriod /360 + m_fPhase) + m_fOffset

		fRad += (((float)x * (float)m_fPeriod) / 360.0f);
		fx = (float)x;
		fy =  (float)y - (m_fAmplitude * (float)sin(fRad) + m_fOffset);
	}

	
	FLOATPOINT fp;
	fp.x = fx;
	fp.y = fy;
	return fp;
}

void CImageWarp::SetParam4f(float fAmplitude, float fPeriod, float fPhase, float fOffset)
{
	m_fAmplitude = fAmplitude;
	m_fPeriod = fPeriod;
	m_fPhase = fPhase;
	m_fOffset = fOffset;
}