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authorStarla Insigna <starla4444@gmail.com>2011-07-30 11:19:14 -0400
committerStarla Insigna <starla4444@gmail.com>2011-07-30 11:19:14 -0400
commit9cd57b731ab1c666d4a1cb725538fdc137763d12 (patch)
tree5bac45ae5157a1cb10c6e45500cbf72789917980 /libs/cocos2d/Support/CGPointExtension.m
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Initial commit (version 0.2.1)
Diffstat (limited to 'libs/cocos2d/Support/CGPointExtension.m')
-rwxr-xr-xlibs/cocos2d/Support/CGPointExtension.m196
1 files changed, 196 insertions, 0 deletions
diff --git a/libs/cocos2d/Support/CGPointExtension.m b/libs/cocos2d/Support/CGPointExtension.m new file mode 100755 index 0000000..b06859d --- /dev/null +++ b/libs/cocos2d/Support/CGPointExtension.m
@@ -0,0 +1,196 @@
1/* cocos2d for iPhone
2 * http://www.cocos2d-iphone.org
3 *
4 * Copyright (c) 2007 Scott Lembcke
5 *
6 * Copyright (c) 2010 Lam Pham
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this software and associated documentation files (the "Software"), to deal
10 * in the Software without restriction, including without limitation the rights
11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 * copies of the Software, and to permit persons to whom the Software is
13 * furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
24 * SOFTWARE.
25 */
26
27#include "stdio.h"
28#include "math.h"
29
30#import "../ccMacros.h" // CC_SWAP
31#include "CGPointExtension.h"
32
33#define kCGPointEpsilon FLT_EPSILON
34
35CGFloat
36ccpLength(const CGPoint v)
37{
38 return sqrtf(ccpLengthSQ(v));
39}
40
41CGFloat
42ccpDistance(const CGPoint v1, const CGPoint v2)
43{
44 return ccpLength(ccpSub(v1, v2));
45}
46
47CGPoint
48ccpNormalize(const CGPoint v)
49{
50 return ccpMult(v, 1.0f/ccpLength(v));
51}
52
53CGPoint
54ccpForAngle(const CGFloat a)
55{
56 return ccp(cosf(a), sinf(a));
57}
58
59CGFloat
60ccpToAngle(const CGPoint v)
61{
62 return atan2f(v.y, v.x);
63}
64
65CGPoint ccpLerp(CGPoint a, CGPoint b, float alpha)
66{
67 return ccpAdd(ccpMult(a, 1.f - alpha), ccpMult(b, alpha));
68}
69
70float clampf(float value, float min_inclusive, float max_inclusive)
71{
72 if (min_inclusive > max_inclusive) {
73 CC_SWAP(min_inclusive,max_inclusive);
74 }
75 return value < min_inclusive ? min_inclusive : value < max_inclusive? value : max_inclusive;
76}
77
78CGPoint ccpClamp(CGPoint p, CGPoint min_inclusive, CGPoint max_inclusive)
79{
80 return ccp(clampf(p.x,min_inclusive.x,max_inclusive.x), clampf(p.y, min_inclusive.y, max_inclusive.y));
81}
82
83CGPoint ccpFromSize(CGSize s)
84{
85 return ccp(s.width, s.height);
86}
87
88CGPoint ccpCompOp(CGPoint p, float (*opFunc)(float))
89{
90 return ccp(opFunc(p.x), opFunc(p.y));
91}
92
93BOOL ccpFuzzyEqual(CGPoint a, CGPoint b, float var)
94{
95 if(a.x - var <= b.x && b.x <= a.x + var)
96 if(a.y - var <= b.y && b.y <= a.y + var)
97 return true;
98 return false;
99}
100
101CGPoint ccpCompMult(CGPoint a, CGPoint b)
102{
103 return ccp(a.x * b.x, a.y * b.y);
104}
105
106float ccpAngleSigned(CGPoint a, CGPoint b)
107{
108 CGPoint a2 = ccpNormalize(a);
109 CGPoint b2 = ccpNormalize(b);
110 float angle = atan2f(a2.x * b2.y - a2.y * b2.x, ccpDot(a2, b2));
111 if( fabs(angle) < kCGPointEpsilon ) return 0.f;
112 return angle;
113}
114
115CGPoint ccpRotateByAngle(CGPoint v, CGPoint pivot, float angle)
116{
117 CGPoint r = ccpSub(v, pivot);
118 float cosa = cosf(angle), sina = sinf(angle);
119 float t = r.x;
120 r.x = t*cosa - r.y*sina + pivot.x;
121 r.y = t*sina + r.y*cosa + pivot.y;
122 return r;
123}
124
125
126BOOL ccpSegmentIntersect(CGPoint A, CGPoint B, CGPoint C, CGPoint D)
127{
128 float S, T;
129
130 if( ccpLineIntersect(A, B, C, D, &S, &T )
131 && (S >= 0.0f && S <= 1.0f && T >= 0.0f && T <= 1.0f) )
132 return YES;
133
134 return NO;
135}
136
137CGPoint ccpIntersectPoint(CGPoint A, CGPoint B, CGPoint C, CGPoint D)
138{
139 float S, T;
140
141 if( ccpLineIntersect(A, B, C, D, &S, &T) ) {
142 // Point of intersection
143 CGPoint P;
144 P.x = A.x + S * (B.x - A.x);
145 P.y = A.y + S * (B.y - A.y);
146 return P;
147 }
148
149 return CGPointZero;
150}
151
152BOOL ccpLineIntersect(CGPoint A, CGPoint B,
153 CGPoint C, CGPoint D,
154 float *S, float *T)
155{
156 // FAIL: Line undefined
157 if ( (A.x==B.x && A.y==B.y) || (C.x==D.x && C.y==D.y) ) return NO;
158
159 const float BAx = B.x - A.x;
160 const float BAy = B.y - A.y;
161 const float DCx = D.x - C.x;
162 const float DCy = D.y - C.y;
163 const float ACx = A.x - C.x;
164 const float ACy = A.y - C.y;
165
166 const float denom = DCy*BAx - DCx*BAy;
167
168 *S = DCx*ACy - DCy*ACx;
169 *T = BAx*ACy - BAy*ACx;
170
171 if (denom == 0) {
172 if (*S == 0 || *T == 0) {
173 // Lines incident
174 return YES;
175 }
176 // Lines parallel and not incident
177 return NO;
178 }
179
180 *S = *S / denom;
181 *T = *T / denom;
182
183 // Point of intersection
184 // CGPoint P;
185 // P.x = A.x + *S * (B.x - A.x);
186 // P.y = A.y + *S * (B.y - A.y);
187
188 return YES;
189}
190
191float ccpAngle(CGPoint a, CGPoint b)
192{
193 float angle = acosf(ccpDot(ccpNormalize(a), ccpNormalize(b)));
194 if( fabs(angle) < kCGPointEpsilon ) return 0.f;
195 return angle;
196}