summaryrefslogtreecommitdiff
path: root/indra/llmath/llrect.h
blob: c03a331aff0a7878f2f273006f328d9a8ad843e5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
/** 
 * @file llrect.h
 * @brief A rectangle in GL coordinates, with bottom,left = 0,0
 *
 * $LicenseInfo:firstyear=2001&license=viewergpl$
 * 
 * Copyright (c) 2001-2009, Linden Research, Inc.
 * 
 * Second Life Viewer Source Code
 * The source code in this file ("Source Code") is provided by Linden Lab
 * to you under the terms of the GNU General Public License, version 2.0
 * ("GPL"), unless you have obtained a separate licensing agreement
 * ("Other License"), formally executed by you and Linden Lab.  Terms of
 * the GPL can be found in doc/GPL-license.txt in this distribution, or
 * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
 * 
 * There are special exceptions to the terms and conditions of the GPL as
 * it is applied to this Source Code. View the full text of the exception
 * in the file doc/FLOSS-exception.txt in this software distribution, or
 * online at
 * http://secondlifegrid.net/programs/open_source/licensing/flossexception
 * 
 * By copying, modifying or distributing this software, you acknowledge
 * that you have read and understood your obligations described above,
 * and agree to abide by those obligations.
 * 
 * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
 * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
 * COMPLETENESS OR PERFORMANCE.
 * $/LicenseInfo$
 */


#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)
	{}

	explicit LLRectBase(const LLSD& sd)
	{
		setValue(sd);
	}

	void setValue(const LLSD& sd)
	{
		mLeft = (Type)sd[0].asInteger(); 
		mTop = (Type)sd[1].asInteger();
		mRight = (Type)sd[2].asInteger();
		mBottom = (Type)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		overlaps(const LLRectBase& rect) const
	{
		return !(mLeft > rect.mRight 
			|| mRight < rect.mLeft
			|| mBottom > rect.mTop 
			|| mTop < rect.mBottom);
	}

	BOOL		contains(const LLRectBase& rect) const
	{
		return mLeft <= rect.mLeft
			&& mRight >= rect.mRight
			&& mBottom <= rect.mBottom
			&& mTop >= rect.mTop;
	}

	LLRectBase& set(Type left, Type top, Type right, Type bottom)
	{
		mLeft = left;
		mTop = top;
		mRight = right;
		mBottom = bottom;
		return *this;
	}

	// Note: follows GL_QUAD conventions: the top and right edges are not considered part of the rect
	LLRectBase& setOriginAndSize( Type left, Type bottom, Type width, Type height)
	{
		mLeft = left;
		mTop = bottom + height;
		mRight = left + width;
		mBottom = bottom;
		return *this;
	}

	// Note: follows GL_QUAD conventions: the top and right edges are not considered part of the rect
	LLRectBase& setLeftTopAndSize( Type left, Type top, Type width, Type height)
	{
		mLeft = left;
		mTop = top;
		mRight = left + width;
		mBottom = top - height;
		return *this;
	}

	LLRectBase& setCenterAndSize(Type x, Type y, Type width, Type height)
	{
		// width and height could be odd, so favor top, right with extra pixel
		mLeft = x - width/2;
		mBottom = y - height/2;
		mTop = mBottom + height;
		mRight = mLeft + width;
		return *this;
	}


	LLRectBase& translate(Type horiz, Type vertical)
	{
		mLeft += horiz;
		mRight += horiz;
		mTop += vertical;
		mBottom += vertical;
		return *this;
	}

	LLRectBase& stretch( Type dx, Type dy)
	{
		mLeft -= dx;
		mRight += dx;
		mTop += dy;
		mBottom -= dy;
		return makeValid();
	}
	
	LLRectBase& stretch( Type delta )
	{
		stretch(delta, delta);
		return *this;
	}
	
	LLRectBase& makeValid()
	{
		mLeft = llmin(mLeft, mRight);
		mBottom = llmin(mBottom, mTop);
		return *this;
	}

	bool isValid() const
	{
		return mLeft <= mRight && mBottom <= mTop;
	}

	bool isEmpty() const
	{
		return mLeft == mRight || mBottom == mTop;
	}

	bool notEmpty() const
	{
		return !isEmpty();
	}

	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) const
	{
		return ((mLeft == b.mLeft) &&
				(mTop == b.mTop) &&
				(mRight == b.mRight) &&
				(mBottom == b.mBottom));
	}

	bool operator!=(const LLRectBase &b) const
	{
		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