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#include "collarea.h"
#include <math.h>
collarea::collarea(float xx,float yy,float w,float h)
{
x=xx;
y=yy;
width=w;
height=h;
dx=x/2;
dy=y/2;
theta = 0;
}
void sethitboundaries(ALLEGRO_BITMAP*& a)
{
al_set_target_bitmap(a);
float r,g,b;
float mr,mg,mb;
mr = mb = 255.0;
mg = 0;
float lim = (width>height) ? width : height;
lim = lim/2;
for(float i=0;i<lim;i++)
{
float left = i;
float right = width-i;
float up = i;
float down = height-i;
//top left
if(!tl.set)
{
al_unmap_rgb_f(al_get_pixel(a,left,up),&r,&g,&b);
if((r!=mr)||(g!=mg)||(b!=mb))
{
tl.x = left;
tl.y = up;
tl.set = 1;
gettrig(tl);
}
}
//top right
if(!tr.set)
{
al_unmap_rgb_f(al_get_pixel(a,right,up),&r,&g,&b);
if((r!=mr)||(g!=mg)||(b!=mb))
{
tl.x = right;
tl.y = up;
tl.set = 1;
gettrig(tr);
}
}
//bottom left
if(!bl.set)
{
al_unmap_rgb_f(al_get_pixel(a,left,down),&r,&g,&b);
if((r!=mr)||(g!=mg)||(b!=mb))
{
tl.x = left;
tl.y = down;
tl.set = 1;
gettrig(bl);
}
}
//bottom right
if(!br.set)
{
al_unmap_rgb_f(al_get_pixel(a,right,down),&r,&g,&b);
if((r!=mr)||(g!=mg)||(b!=mb))
{
tl.x = left;
tl.y = down;
tl.set = 1;
gettrig(br);
}
}
}
if(!tl.set)
{
tl.x=dx;
tl.y=dy;
tl.set=1;
tl.theta=0;
tl.hyp=0;
}
if(!tr.set)
{
tr.x=dx;
tr.y=dy;
tr.set=1;
tr.theta=0;
tr.hyp=0;
}
if(!bl.set)
{
bl.x=dx;
bl.y=dy;
bl.set=1;
bl.theta=0;
bl.hyp=0;
}
if(!br.set)
{
br.x=dx;
br.y=dy;
br.set=1;
br.theta=0;
br.hyp=0;
}
}
pt collarea::getbl()
{
return abspt(rotate(bl));
}
pt collarea::getbr()
{
return abspt(rotate(br));
}
pt collarea::gettl()
{
return abspt(rotate(tl));
}
pt collarea::gettr()
{
return abspt(rotate(tr));
}
pt collarea::toa(pt a) //to adjusted point: origin in middle
{
pt b;
b.x = a.x - dx;
b.y = dy - a.y;
return b;
}
pt collarea::tor(pt a) //to real point: origin in top left corner
{
pt b;
b.x = a.x + dx;
b.y = dy - a.y;
return b;
}
pt collarea::abspt(pt a)
{
pt b;
b.x = a.x+x;
b.y = a.y+y;
return b;
}
int collarea::didhit(collarea a)
{
int HIT = 0;
pt spots[8];
spots[0] = gettl();
spots[1] = gettr();
spots[2] = getbr();
spots[3] = getbl();
spots[4] = a.gettl();
spots[5] = a.gettr();
spots[6] = a.getbr();
spots[7] = a.getbl();
float bx,sx,by,sy;
bx = sx = spots[0].x;
by = sy = spots[0].y;
for(int i=0;i<8;i++)
{
sx = (spots[i].x < sx) ? spots[i].x : sx;
bx = (spots[i].x > bx) ? spots[i].x : bx;
sy = (spots[i].y < sy) ? spots[i].y : sy;
by = (spots[i].y > by) ? spots[i].y : by;
}
float w = bx-sx;
float h = by-sy;
pt eqs[8];
for(int i=0;i<8;i++)
{
int ca = ((i+1)%4)+4*(i/4);
eqs[i] = geteq(spots[i],spots[ca]);
}
for(int i=0;i<4;i++)
{
int k = (i+1)%4;
for(int j=4;j<8;j++)
{
//if lines aren't parallel (and on top of each other)
if(eqs[i].x!=eqs[j].x) // i = eq 1 j = eq 2
{
//calculate point where they cross
//x(cross) = (b2 - b1)/(m1 - m2)
int crx = (eqs[j].y - eqs[i].y)/(eqs[i].x - eqs[j].x);
if((crx > spots[i].x) && (crx < spots[k].x))
{
//crossing point occurs somewhere on the line between points in question
//its a hit
HIT = 1;
}
}
}
}
return HIT;
}
pt collarea::geteq(pt a, pt b)// x = m (slope) y = b in y = mx + b
{
//y = mx + b
pt c;
c.x = (b.y-a.y)/(b.x-a.x); // m = rise/run
c.y = a.y - (c.x*a.x); //b = y1 - m*x1
//double check with b = y2 - m*x2
float h = b.y - (c.x*b.x);
if(c.y!=h)
{
throw "Formula error geteq(pt a, pt b) in collarea.cpp";
}
}
void collarea::turn(float n)
{
theta += n;
if(theta<0)
{
theta += 360;
}
else if(theta >= 360)
{
theta -= 360;
}
}
void collarea::settheta(float n)
{
theta = n;
if(theta<0)
{
theta += 360;
}
else if(theta >= 360)
{
theta -= 360;
}
}
void collarea::setpt(float xx,float yy)
{
x=xx;
y=yy;
}
void collarea::gettrig(pt& a)
{
pt b = toa(a);
a.hyp = sqrt((b.x*b.x)+(b.y*b.y));
a.theta = atan(b.x/b.y);
}
pt collarea::rotate(pt a)
{
pt b;
float ang = a.theta + theta;
if(ang<0)
{
ang += 360;
}
else if(ang>360)
{
ang -= 360;
}
b.y = sin(ang)*a.hyp;
b.x = cos(ang)*a.hyp;
return tor(b);
}
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