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MrChrisnis

Sprite won't automove properly

3 posts in this topic

I am trying to get a sprite to move around a path that is just a part of the background image automatically. I am using C++ and SDL, however when the sprite moves around 2 parts of the path, it hits a corner and then it will not automove from right to left. I have tried a few different ways of doing it (there is a part coded out in the code below where I tried it with the if statement outside of the other one, still same problem)

[img]http://i44.tinypic.com/33mmwpt.png[/img]

The image shows where the sprite gets stuck.

[code]if(E[0]->get_x() <= 205)
{
E[0]->set_velocities(1, 0);
E[0]->auto_move(1);
E[0]->move();
}
/* else if(E[0]->get_y() >= 380)
{
E[0]->set_velocities(-1, 0);
E[0]->auto_move(1);
E[0]->move();
}*/
else if(E[0]->get_x() > 204)
{
if(E[0]->get_y() < 380)
{
E[0]->set_velocities(0, 1);
E[0]->auto_move(1);
E[0]->move();
}
else if(E[0]->get_y() == 380)
{
E[0]->set_velocities(-1, 0);
E[0]->auto_move(-1);
E[0]->move();
}
}[/code]

Probably something really simple that I am just missing but I cannot for the life of me find it :(
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[i]oh my god, i think it would be better that in the condition of 'if' statement the [color="#000000"]get_x[/color][color="#666600"]() shoule be used with [/color][color="#000000"]get_y[/color][color="#666600"]() , or else it is easily mess up[/color] [/i]
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This is pretty simple to solve, and will help make your code cleaner. Lets say for example your sprite has 4 possible movement changes.

1. Top Left (X, Y) or Point A (X, Y)
2. Top Right (X, Y) or Point B (X, Y)
3. Bottom Right (X, Y) or Point C (X, Y)
4. Bottom Left (X, Y) or Point D (X, Y)

Start the sprite at Point A.

When your sprite hits Point B (250, 30) -> Moving Down.
When your sprite hits Point C (250, 130) -> Moving Left.
When your sprite hits Point D (0, 130) -> Moving Up
When your sprite hits Point A (0, 30) -> Moving Right

Rinse and repeat!
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