c++ - shooting bullet based on an angle from a point -

what doing scanning area sprite of straight line rotate 20 degrees , forth

when tap action button want shoot bullet in direction of rotation of sprite

i angle doing a

sprite->getrotation(); 

and have point of unit available, lets (0,0)

i'm guessing need find point on line, don't know math behind it.

is possible?

given know velocity of bullet (pixels/second), let me assume call v. takes s seconds transverse screen. , x represents position of bullet @ axis x (same y variable), can actualize both variables using simple trigonometry:

x = 0; // initial position. start @ (0,0) y = 0;  (int = 0; < s; i++) {    sleep(1);    // in unistd.h    x += v*cos(angle);  // include math.h    y += v*sin(angle);  // angle in radian, of course    // draw sprite here, @ (x, y) }