]>
Dogcows Code - chaz/yoink/blob - src/Moof/Line.hh
4a54e2d5f008c5bcd62c21340b552ffeb0eb809a
2 /*******************************************************************************
4 Copyright (c) 2009, Charles McGarvey
7 Redistribution and use in source and binary forms, with or without
8 modification, are permitted provided that the following conditions are met:
10 * Redistributions of source code must retain the above copyright notice,
11 this list of conditions and the following disclaimer.
12 * Redistributions in binary form must reproduce the above copyright notice,
13 this list of conditions and the following disclaimer in the documentation
14 and/or other materials provided with the distribution.
16 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
20 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
23 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *******************************************************************************/
29 #ifndef _MOOF_LINE_HH_
30 #define _MOOF_LINE_HH_
32 #include <Moof/Drawable.hh>
33 #include <Moof/Math.hh>
34 #include <Moof/OpenGL.hh>
35 #include <Moof/Ray.hh>
36 #include <Moof/Texture.hh>
38 #include <Moof/Log.hh>
45 struct Line
: public Drawable
, public Shape
<D
>
47 typedef cml::vector
< Scalar
, cml::fixed
<D
> > Vector
;
52 Scalar
intersectRay(const Ray
<2>& ray
, Ray
<2>::Intersection
& intersection
)
54 // solve: Cx + r*Dx = Ax + s(Bx - Ax)
55 // Cy + r*Dy = Ay + s(By - Ay)
56 // where: 0 <= s <= 1 if intersection
62 Scalar denom
= ray
.direction
[0] * (b
[1] - a
[1]) +
63 ray
.direction
[1] * (a
[0] - b
[0]);
65 // check if the ray and line are parallel
66 if (isEqual(denom
, SCALAR(0.0)))
68 Scalar numer
= a
[0] * (ray
.point
[1] - b
[1]) +
69 b
[0] * (a
[1] - ray
.point
[1]) +
70 ray
.point
[0] * (b
[1] - a
[1]);
72 // check if they are collinear
73 if (isEqual(numer
, SCALAR(0.0)))
75 intersection
.point
= ray
.point
;
76 intersection
.normal
.set(0.0, 0.0);
83 Scalar s
= (ray
.direction
[0] * (ray
.point
[1] - a
[1]) +
84 ray
.direction
[1] * (a
[0] - ray
.point
[0])) / denom
;
86 // check if the ray hits the segment
87 if (s
< SCALAR(0.0) || s
> SCALAR(1.0)) return SCALAR(-1.0);
89 Scalar r
= -(a
[0] * (ray
.point
[1] - b
[1]) +
90 b
[0] * (a
[1] - ray
.point
[1]) +
91 ray
.point
[0] * (b
[1] - a
[1])) / denom
;
93 // make sure we're dealing with the right side of the ray
94 if (r
< SCALAR(0.0)) return SCALAR(-1.0);
96 intersection
.point
= ray
.point
+ r
* ray
.direction
;
98 // gotta use the correct normal
99 Vector n
= cml::perp(a
- b
);
100 if (cml::dot(a
- ray
.point
, n
) < 0) intersection
.normal
= n
;
101 else intersection
.normal
= -n
;
106 void draw(Scalar alpha
= 0.0) const
108 Mf::Texture::resetBind();
117 template <int D
, int N
>
118 struct Polygon
: public Shape
<D
>
120 typedef cml::vector
< Scalar
, cml::fixed
<D
> > Vector
;
128 #endif // _MOOF_LINE_HH_
130 /** vim: set ts=4 sw=4 tw=80: *************************************************/
This page took 0.038633 seconds and 4 git commands to generate.