我正在为学校做一个有关子弹碰撞的项目。如果线是直的，它可以正常工作，但是还有一种选项是子弹扩散。因此，角度已经给定，子弹所在的直线点也已经给定，但是如何从角度和距离创建一个随机点并实现子弹碰撞呢？以下是子弹碰撞的代码：
private void setEndPoint()
{
endPoint = new Point(beginPoint.x, beginPoint.y);
switch (direction)
{
default:
break;
case UP:
while (endPoint.y > 0)
{
if (tileEmptyCheck(endPoint.x, endPoint.y))
{
endPoint.y -= 1;
}
else
{
fire();
break;
}
}
break;
case LEFT:
while (endPoint.x > 0)
{
if (tileEmptyCheck(endPoint.x, endPoint.y))
{
endPoint.x -= 1;
}
else
{
fire();
break;
}
}
break;
case DOWN:
while (endPoint.y < map.getHeightInTiles() * GameState.TILESIZE)
{
if (tileEmptyCheck(endPoint.x, endPoint.y))
{
endPoint.y += 1;
}
else
{
fire();
break;
}
}
break;
case RIGHT:
while (endPoint.x < map.getWidthInTiles() * GameState.TILESIZE)
{
if (tileEmptyCheck(endPoint.x, endPoint.y))
{
endPoint.x += 1;
}
else
{
fire();
break;
}
}
break;
case RIGHT_UP:
while (endPoint.y > 0 && endPoint.x < map.getWidthInTiles() * GameState.TILESIZE)
{
if (tileEmptyCheck(endPoint.x, endPoint.y))
{
endPoint.y -= 1;
endPoint.x += 1;
}
else
{
fire();
break;
}
}
break;
case RIGHT_DOWN:
while (endPoint.y < map.getHeightInTiles() * GameState.TILESIZE &&
endPoint.x < map.getWidthInTiles() * GameState.TILESIZE)
{
if (tileEmptyCheck(endPoint.x, endPoint.y))
{
endPoint.y += 1;
endPoint.x += 1;
}
else
{
fire();
break;
}
}
break;
case LEFT_DOWN:
while (endPoint.y < map.getHeightInTiles() * GameState.TILESIZE &&
endPoint.x > 0)
{
if (tileEmptyCheck(endPoint.x, endPoint.y))
{
endPoint.y += 1;
endPoint.x -= 1;
}
else
{
fire();
break;
}
}
break;
case LEFT_UP:
while (endPoint.y > 0 &&
endPoint.x > 0)
{
if (tileEmptyCheck(endPoint.x, endPoint.y))
{
endPoint.y -= 1;
endPoint.x -= 1;
}
else
{
fire();
break;
}
}
break;
}
}