102 lines
3.0 KiB
C++
102 lines
3.0 KiB
C++
//
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// vec2.h
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// CubicVR2
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//
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// Created by Charles J. Cliffe on 2013-02-22.
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// Copyright (c) 2013 Charles J. Cliffe. All rights reserved.
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//
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#ifndef __CubicVR2__vec2__
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#define __CubicVR2__vec2__
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#include <iostream>
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#include <cmath>
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#include "cubic_types.h"
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#include <stddef.h>
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namespace CubicVR {
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#define vec2SG(c,x,y) \
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vec2 COMBINE(get,x)() { return y; } \
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c & COMBINE(set,x)(vec2 value) { y = value; return *this; }
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struct vec2 {
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__float x, y;
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public:
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__float& u() { return x; }
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__float& v() { return y; }
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//access as-array:
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inline __float& operator [] (size_t i) {
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__float* as_array = (__float*)this;
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return (as_array[i]);
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}
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inline const __float& operator [] (size_t i) const {
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__float* as_array = (__float*)this;
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return (as_array[i]);
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}
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vec2 (__float xi,__float yi) { x = xi; y = yi; }
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vec2 () { x = y = 0.0f; }
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vec2 operator*(__float v) { return vec2( x*v, y*v ); }
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// vec2 operator*(vec2 v) { return vec2::cross(*this,v); }
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vec2 operator+(vec2 v) { return vec2::add(*this,v); }
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vec2 operator-(vec2 v) { return vec2::subtract(*this,v); }
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static bool equal(vec2 a, vec2 b, __float epsilon = 0.00000001) {
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return (fabs(a[0] - b[0]) < epsilon && fabs(a[1] - b[1]) < epsilon);
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};
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static bool onLine(vec2 a, vec2 b,vec2 c) {
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__float minx = (a[0]<b[0])?a[0]:b[0];
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__float miny = (a[1]<b[1])?a[1]:b[1];
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__float maxx = (a[0]>b[0])?a[0]:b[0];
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__float maxy = (a[1]>b[1])?a[1]:b[1];
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if ((minx <= c[0] && c[0] <= maxx) && (miny <= c[1] && c[1] <= maxy)) {
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return true;
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} else {
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return false;
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}
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};
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static vec2 lineIntersect(vec2 a1, vec2 a2, vec2 b1, vec2 b2) {
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__float x1 = a1[0], y1 = a1[1], x2 = a2[0], y2 = a2[1];
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__float x3 = b1[0], y3 = b1[1], x4 = b2[0], y4 = b2[1];
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__float d = ((x1-x2) * (y3-y4)) - ((y1-y2) * (x3-x4));
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if (d == 0) return vec2(INFINITY,INFINITY);
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__float xi = (((x3-x4) * ((x1*y2)-(y1*x2))) - ((x1-x2) *((x3*y4)-(y3*x4))))/d;
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__float yi = (((y3-y4) * ((x1*y2)-(y1*x2))) - ((y1-y2) *((x3*y4)-(y3*x4))))/d;
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return vec2( xi,yi );
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};
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static vec2 add(vec2 a,vec2 b) {
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return vec2(a[0]+b[0],a[1]+b[1]);
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};
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static vec2 subtract(vec2 a, vec2 b) {
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return vec2(a[0]-b[0],a[1]-b[1]);
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};
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static __float length(vec2 a,vec2 b) {
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vec2 s(a[0]-b[0],a[1]-b[1]);
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return sqrtf(s[0]*s[0]+s[1]*s[1]);
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};
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static __float length(vec2 a) {
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return sqrtf(a[0]*a[0]+a[1]*a[1]);
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};
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};
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}
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#endif /* defined(__CubicVR2__vec2__) */
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