A bot used for https://code-your-snake.codingmaster398.repl.co/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
44 lines
1.4 KiB
44 lines
1.4 KiB
# Obstacles
|
|
A grid without any obstacles is boring. Let us create a grid with obstacles:
|
|
|
|
```javascript
|
|
var walkabilityMatrix = [[0, 0, 0, 0, 0],
|
|
[1, 1, 1, 1, 0],
|
|
[0, 0, 0, 0, 0],
|
|
[0, 1, 1, 1, 1],
|
|
[0, 0, 0, 0, 0],
|
|
[1, 1, 1, 1, 0],
|
|
[0, 0, 0, 0, 0]];
|
|
var grid = new PF.Grid(matrix);
|
|
```
|
|
|
|
The _walkabilityMatrix_ defines which cells are walkable and which have
|
|
obstacles. Ones are obstacles and zeroes are walkable. Alternatively, you can
|
|
also set the obstacles on the grid by calling the `setWalkableAt` function:
|
|
|
|
```javascript
|
|
var grid = new PF.Grid(5, 7);
|
|
grid.setWalkableAt(0, 1, false);
|
|
grid.setWalkableAt(1, 1, false);
|
|
grid.setWalkableAt(2, 1, false);
|
|
...
|
|
```
|
|
|
|
After setting the obstacles the grid should look like this.
|
|
|
|
|
|
|
|
Let us find a path now.
|
|
|
|
```javascript
|
|
var finder = new PF.AStarFinder();
|
|
var path = finder.findPath(0, 0, 4, 6, grid);
|
|
```
|
|
|
|
PathFinding.js will find the following path:
|
|
|
|
|
|
|
|
Notice how the path moves diagonally where it can, thus making it shorter. This
|
|
may not be always desirable and you may want to create a path without any
|
|
diagonal movement. Read the next section to find out how to achieve that.
|
|
|