This is my first ImpactJS plugin. This plugin can show a "Line of Sight" effect in your ImpactJS games.

• The game must be tile based.
• There should be a player.
• The player must be in the middle of the screen.
• and, ImpactJS (buy your own license for $99)

Demo page on indienova.com

1. Put the plugin file here: lib/plugins/mw_los.js
2. Require 'plugins.mw_los'.

Initialize:

this.los = new ig.MW_LineOfSight(
    // player must be set
    player          :   this.player,
    // Debug settings
    debug           :   true,
    // Color settings
    startColor      :   'rgba(0, 0, 0, 0)',
    endColor        :   'rgba(0, 0, 0, 0.55)',
    startRadius     :   ig.system.height/4,
    endRadius       :   ig.system.height/2,
    strokeColor     :   'rgba(255, 0, 255, 1)'
});

Then put these codes in the draw() loop of the game:

if (this.los) 
    this.los.drawLOS();
    //this.los.drawForwardEdges();    // Draw the edges, normally don't show it
    this.los.drawCalculatedEdges();   // Draw the lights and shadow
}

• player (Required) the player instance
• debug debug mode true/false
• startColor start color for RadialGradient
• startRadius start radius for RadialGradient
• endColor end color for RadialGradient
• endRadius end radius for RadialGradient
• startColor stroke color for viewable area, don't define it if you don't want the stroke

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.