C# and SFML game intersection -


i have problem moveentity() method in 2d platformer game (like pacman). when player on intersection path want make:

e.isatintersection = true;

and call updatedirection().

but doesn't stop, instead goes through paths , doesn't matter if there walls or empty paths. program never reaches above line. member stays false. maybe there possibility write in easier way or there simple mistake made. here complete method:

private void moveentity(entity e) {     int angle = 0;      if (e.currentdirection == direction.right) angle = 0;     else if (e.currentdirection == direction.down) angle = 90;     else if (e.currentdirection == direction.left) angle = 180;     else if (e.currentdirection == direction.up) angle = 270;      var scalex = math.round(math.cos(angle * (math.pi / 180.0)));     var scaley = math.round(math.sin(angle * (math.pi / 180.0)));      var velocityx = (float)(e.speed * scalex);     var velocityy = (float)(e.speed * scaley);      sprite sp = sprites[e.name];     vector2f v = new vector2f(sp.position.x + velocityx, sp.position.y + velocityy);     sp.position = v;      var ecenterx = sp.position.x + sp.texturerect.width / 2;     var ecentery = sp.position.y + sp.texturerect.height / 2;      var tiley = math.floor((ecentery) / tileheight);     var tilex = math.floor((ecenterx) / tilewidth);      var tilexpos = tilewidth * math.floor(tilex + 1);     var tileypos = tileheight * math.floor(tiley + 1);      e.x = (int)tiley;     e.y = (int)tilex;      if (ecenterx == tilexpos && ecentery == tileypos)         e.isatintersection = true;     else         e.isatintersection = false; }

the == operator, floating points, checks exact equality. floats have gone through similar operations still not equal. when compare equality on floats best practice following:

if(math.abs(floata-floatb) <= somesmallfloat)

somesmallfloat here set float.epsilon in case may want use higher number allow margin error, more fun allow player move if off, punish player small inaccuracies.


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