lineOfSight

lineOfSight

> Functions

Checks the line of sight between the start cell and the end cell, ignoring entities in the entityToIgnore array.

Example: if (lineOfSight(getCell(), getCell(enemy))

The algorithm is described as follows:

• Draw a segment between the centers of the two cells tested.
• List the cells crossed by this segment. A cell is not considered crossed if the segment touches its edge, or if it is ignored.
• If only one of these crossed cells is an obstacle or contains an entity, the line of sight is blocked, otherwise it is clear.

Parameters

• start: Starting cell.
• end: Target cell.
• entityToIgnore (optional): Entity to ignore or array of entities to ignore, by default, your entity is ignored.

Return

• los: (boolean)
• null if start or end is not a cell of the map;
• true if the line of sight is clear;
• false otherwise.

Demonstration

Click on a cell to display all cells that are in line of sight with it.