void LineDDA(void)
{
double dx=(X2-X1);
double dy=(Y2-Y1);
float xInc,yInc,x=X1,y=Y1;
/* Find out whether to increment x or y */
int dStart = 2*dy - dx;
int dE = 2*dy;
int dNE = 2*(dy - dx);
/* Clears buffers to preset values */
glClear(GL_COLOR_BUFFER_BIT);
/* Plot the points */
glBegin(GL_POINTS);
/* Plot the first point */
glVertex2d(x,y);
int d;
/* For every step, find an intermediate vertex */
d = dStart;
while(x<X2 && y<Y2)
{
if(d<0){
d = d + dE;
}else{
d = d + dNE;
y = y + 1;
}
x = x + 1;
printf("%0.6lf %0.6lf\n",floor(x), floor(y));
glVertex2d(round_value(x), round_value(y));
}
glEnd();
glFlush();
}
Vec2<Type> &Vec2<Type>::rotate(const Vec2<Type>& hotspot, const Angle &angle)
{
// Move the hotspot to 0,0
Vec2<Type> r(x - hotspot.x, y - hotspot.y);
float radians = angle.to_radians();
float sin_angle = sinf(radians);
float cos_angle = cosf(radians);
float dest_x = (float) r.x * cos_angle - (float) r.y * sin_angle;
float dest_y = (float) r.x * sin_angle + (float) r.y * cos_angle;
x = round_value(dest_x + hotspot.x);
y = round_value(dest_y + hotspot.y);
return *this;
}