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In the flying shooting game, I'm afraid there is no game without a tracking algorithm. For example, when playing the arcade, is not often hung in the boss's "tracking bomb"?
How is this achieved? Very simple, as long as there is a little math knowledge in high school!
First recall several trigonometric Sin,cos,tan (TG), arctan (ARCTG)
Sin (x) on the Edge/hypotenuse. In 1, 2 items are limited to positive, 3, 4 are negative
cos (x) adjacent edge/hypotenuse. In 1, 4 items are limited to positive, 2, 3 are negative
Tan (x) on the edge/adjacent edge. In 1, 3 items are limited to positive, 2, 4 are negative
Take into account that the coordinate system in the game is as follows:
Assuming that the enemy bullet coordinates are SLUG.X,SLUG.Y, the bullet's speed is slug.speed (all double type)
The hypotenuse of the triangle above represents the speed of the bullet, and the change in the coordinates of each time the bullet is moved is:
slug.x + = slug.speed * cos (theta);
SLUG.Y + = Slug.speed * sin (theta);
When an enemy bullet is fired at you, the first thing to do is to calculate the position of the bullet and the angle theta
The simple calculation is:
Double deltax = player.x-slug.x; Note that the position of the protagonist as the starting point is x1-x0
Double DeltaY = player.y-slug.y; Y1-y0
In order to prevent dividing the denominator is 0, make a judgment, so that the denominator is approximately 0, whether it is a negative approximation or positive approximation? This requires comparing bullets and your y-coordinates who are big or small.
if (DeltaX = = 0)
{
if (player.y = slug.y)//The bullet needs to be moved down
DeltaX = 0.0000001;
else//bullets need to move up
DeltaX =-0.0000001;
}
In the same vein, Judge DeltaY.
if (DeltaY = = 0)
{
if (player.x = slug.x)//bullets need to move right
DeltaY = 0.0000001;
else//bullets need to move left
DeltaY =-0.0000001;
}
Now judge the terms of the angle
if (deltax0 deltay0)
Angle = Atan (Fabs (deltay/deltax)); The first limit
else if (deltax0 deltay0)
Angle =-atan (Fabs (Deltay/deltax))//second limit
else if (deltax0 deltay0)
Angle = +atan (Fabs (Deltay/deltax))//third limit
Else
Angle = 2-atan (Fabs (Deltay/deltax))//Fourth limit
which takes 3.1415926 (hehe, don't forget the approximate OH)
Well, now that we've got the right direction, we can calculate the bullet coordinates!
slug.x + = slug.speed * cos (theta);
SLUG.Y + = Slug.speed * sin (theta);
So, before each bullet moves, make a judgment, recalculate the angle, how about? Is the "Trace" coming out?
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The algorithm of game tracking projectile
