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/**
* @file llrect.h
* @brief A rectangle in GL coordinates, with bottom,left = 0,0
*
* Copyright (c) 2001-$CurrentYear$, Linden Research, Inc.
* $License$
*/
#ifndef LL_LLRECT_H
#define LL_LLRECT_H
#include <iostream>
#include "llmath.h"
#include "llsd.h"
// Top > Bottom due to GL coords
template <class Type> class LLRectBase
{
public:
Type mLeft;
Type mTop;
Type mRight;
Type mBottom;
// Note: follows GL_QUAD conventions: the top and right edges are not considered part of the rect
Type getWidth() const { return mRight - mLeft; }
Type getHeight() const { return mTop - mBottom; }
Type getCenterX() const { return (mLeft + mRight) / 2; }
Type getCenterY() const { return (mTop + mBottom) / 2; }
LLRectBase(): mLeft(0), mTop(0), mRight(0), mBottom(0)
{}
LLRectBase(const LLRectBase &r):
mLeft(r.mLeft), mTop(r.mTop), mRight(r.mRight), mBottom(r.mBottom)
{}
LLRectBase(Type left, Type top, Type right, Type bottom):
mLeft(left), mTop(top), mRight(right), mBottom(bottom)
{}
LLRectBase(const LLSD& sd)
{
setValue(sd);
}
const LLRectBase& operator=(const LLSD& sd)
{
setValue(sd);
return *this;
}
void setValue(const LLSD& sd)
{
mLeft = sd[0].asInteger();
mTop = sd[1].asInteger();
mRight = sd[2].asInteger();
mBottom = sd[3].asInteger();
}
LLSD getValue() const
{
LLSD ret;
ret[0] = mLeft;
ret[1] = mTop;
ret[2] = mRight;
ret[3] = mBottom;
return ret;
}
// Note: follows GL_QUAD conventions: the top and right edges are not considered part of the rect
BOOL pointInRect(const Type x, const Type y) const
{
return mLeft <= x && x < mRight &&
mBottom <= y && y < mTop;
}
//// Note: follows GL_QUAD conventions: the top and right edges are not considered part of the rect
BOOL localPointInRect(const Type x, const Type y) const
{
return 0 <= x && x < getWidth() &&
0 <= y && y < getHeight();
}
void clampPointToRect(Type& x, Type& y)
{
x = llclamp(x, mLeft, mRight);
y = llclamp(y, mBottom, mTop);
}
void clipPointToRect(const Type start_x, const Type start_y, Type& end_x, Type& end_y)
{
if (!pointInRect(start_x, start_y))
{
return;
}
Type clip_x = 0;
Type clip_y = 0;
Type delta_x = end_x - start_x;
Type delta_y = end_y - start_y;
if (end_x > mRight) clip_x = end_x - mRight;
if (end_x < mLeft) clip_x = end_x - mLeft;
if (end_y > mTop) clip_y = end_y - mTop;
if (end_y < mBottom) clip_y = end_y - mBottom;
// clip_? and delta_? should have same sign, since starting point is in rect
// so ratios will be positive
F32 ratio_x = ((F32)clip_x / (F32)delta_x);
F32 ratio_y = ((F32)clip_y / (F32)delta_y);
if (ratio_x > ratio_y)
{
// clip along x direction
end_x -= (Type)(clip_x);
end_y -= (Type)(delta_y * ratio_x);
}
else
{
// clip along y direction
end_x -= (Type)(delta_x * ratio_y);
end_y -= (Type)clip_y;
}
}
// Note: Does NOT follow GL_QUAD conventions: the top and right edges ARE considered part of the rect
// returns TRUE if any part of rect is is inside this LLRect
BOOL rectInRect(const LLRectBase* rect) const
{
return mLeft <= rect->mRight && rect->mLeft <= mRight &&
mBottom <= rect->mTop && rect->mBottom <= mTop ;
}
void set(Type left, Type top, Type right, Type bottom)
{
mLeft = left;
mTop = top;
mRight = right;
mBottom = bottom;
}
// Note: follows GL_QUAD conventions: the top and right edges are not considered part of the rect
void setOriginAndSize( Type left, Type bottom, Type width, Type height)
{
mLeft = left;
mTop = bottom + height;
mRight = left + width;
mBottom = bottom;
}
// Note: follows GL_QUAD conventions: the top and right edges are not considered part of the rect
void setLeftTopAndSize( Type left, Type top, Type width, Type height)
{
mLeft = left;
mTop = top;
mRight = left + width;
mBottom = top - height;
}
void setCenterAndSize(Type x, Type y, Type width, Type height)
{
mLeft = x - width/2;
mTop = y + height/2;
mRight = x + width/2;
mBottom = y - height/2;
}
void translate(Type horiz, Type vertical)
{
mLeft += horiz;
mRight += horiz;
mTop += vertical;
mBottom += vertical;
}
void stretch( Type dx, Type dy)
{
mLeft -= dx;
mRight += dx;
mTop += dy;
mBottom -= dy;
makeValid();
}
void stretch( Type delta )
{
stretch(delta, delta);
}
void makeValid()
{
mLeft = llmin(mLeft, mRight);
mBottom = llmin(mBottom, mTop);
}
void unionWith(const LLRectBase &other)
{
mLeft = llmin(mLeft, other.mLeft);
mRight = llmax(mRight, other.mRight);
mBottom = llmin(mBottom, other.mBottom);
mTop = llmax(mTop, other.mTop);
}
void intersectWith(const LLRectBase &other)
{
mLeft = llmax(mLeft, other.mLeft);
mRight = llmin(mRight, other.mRight);
mBottom = llmax(mBottom, other.mBottom);
mTop = llmin(mTop, other.mTop);
if (mLeft > mRight)
{
mLeft = mRight;
}
if (mBottom > mTop)
{
mBottom = mTop;
}
}
friend std::ostream &operator<<(std::ostream &s, const LLRectBase &rect)
{
s << "{ L " << rect.mLeft << " B " << rect.mBottom
<< " W " << rect.getWidth() << " H " << rect.getHeight() << " }";
return s;
}
bool operator==(const LLRectBase &b)
{
return ((mLeft == b.mLeft) &&
(mTop == b.mTop) &&
(mRight == b.mRight) &&
(mBottom == b.mBottom));
}
bool operator!=(const LLRectBase &b)
{
return ((mLeft != b.mLeft) ||
(mTop != b.mTop) ||
(mRight != b.mRight) ||
(mBottom != b.mBottom));
}
static LLRectBase<Type> null;
};
template <class Type> LLRectBase<Type> LLRectBase<Type>::null(0,0,0,0);
typedef LLRectBase<S32> LLRect;
typedef LLRectBase<F32> LLRectf;
#endif
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