87 lines
1.6 KiB
C++
87 lines
1.6 KiB
C++
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//-----------------------------------------------------------------------------+
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// Copyright (C), 1998-2007, Beijing Tangent Software Co. Ltd.
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// = FileName : TPGeEllipse.cpp
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// = Version : ver2.0
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// = Author : wlw
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// = CreateDate : 2002-09-09
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// = Description: ÀàµÄ¶¨Òå
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// = Maintainers:
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//
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//-----------------------------------------------------------------------------+
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#include "StdAfx.h"
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#include "TPGeEllipse.h"
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TPGeEllipse::TPGeEllipse()
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{
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}
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TPGeEllipse::TPGeEllipse(const TGPoint&pt,double aRadius,double bRadius):center(pt),a(aRadius),b(bRadius)
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{
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}
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TPGeEllipse::~TPGeEllipse()
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{
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}
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bool TPGeEllipse::IsValid() const
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{
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return UP_ZEROD(a) && UP_ZEROD(b);
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}
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bool TPGeEllipse::IsCircle() const
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{
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double temp = a - b;
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return EQUAL_ZEROD(temp);
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}
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void TPGeEllipse::Pt2Pa(const TGPoint&pt,double&pa) const
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{
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pa = TGVector2D(center,pt).GetAngle();
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}
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void TPGeEllipse::Pa2Pt(double pa,TGPoint&pt) const
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{
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pt.x = center.x + a * cos(pa);
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pt.y = center.y + b * sin(pa);
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pt.z = center.z;
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}
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bool TPGeEllipse::operator != (const TPGeEllipse&e) const
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{
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return !(*this == e);
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}
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GRelation TPGeEllipse::HitTest(const TGPoint&pt) const
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{
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double dx = pt.x - center.x, dy = pt.y - center.y;
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double temp = dx * dx / (a * a) + dy * dy / (b * b) - 1;
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if(UP_ZERO(temp))
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{
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return GR_OUTSIDE;
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}
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else if(DOWN_ZERO(temp))
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{
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return GR_INSIDE;
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}
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else
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{
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return GR_IN;
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}
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}
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bool TPGeEllipse::operator == (const TPGeEllipse&e) const
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{
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double d = a - e.a;
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if(EQUAL_ZEROD(d))
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{
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d = b - e.b;
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if(EQUAL_ZEROD(d))
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{
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return center == e.center;
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}
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}
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return false;
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}
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