Bresenham's Line of Sight

Developer
Ash Blue
Size
2,881 Kb
Views
46,529

How do I make an bresenham's line of sight?

Optimized JavaScript line of sight algorithm implementation.. What is a bresenham's line of sight? How do you make a bresenham's line of sight? This script and codes were developed by Ash Blue on 18 July 2022, Monday.

Bresenham's Line of Sight Previews
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Bresenham's Line of Sight - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>Bresenham's Line of Sight</title> <link rel="stylesheet" href="css/style.css">
</head>
<body> <h1>Bresenham's Line of Sight</h1>
<button id="btn-check-sight">Validate Sight</button>
<h2>Start</h2>
<label for="start-x">X</label>
<input value="3" size="1" maxLength="1" id="start-x" type="text/css" />
<label for="start-y">Y</label>
<input value="1" size="1" maxLength="1" id="start-y" type="text/css" />
<h2>End</h2>
<label for="end-x">X</label>
<input value="5" size="1" maxLength="1" id="end-x" type="text/css" />
<label for="end-y">Y</label>
<input value="3" size="1" maxLength="1" id="end-y" type="text/css" />
<h2>Map</h2>
<p id="result"></p>
<div id="map"></div>
<h2>References</h2>
<ul> <li>http://en.wikipedia.org/wiki/Bresenham%27s_line_algorithm</li> <li>http://www.cse.chalmers.se/edu/year/2010/course/TDA361/grid.pdf</li>
</ul> <script src='http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js'></script> <script src="js/index.js"></script>
</body>
</html>

Bresenham's Line of Sight - Script Codes CSS Codes

h1, h2 { font-family: helvetica, arial, sans-serif; margin: 15px 0 2px 0;
}
input { margin-right: 10px;
}

Bresenham's Line of Sight - Script Codes JS Codes

/*
Author: Ash Blue
Site: blueashes.com
Implementing Z-Axis support
- Tile map will need to indicate vision with a separate array or non-numeric value (ex 'v')
*/
var $BTN_SIGHT = $('#btn-check-sight');
var _event = { isVisible: function () { var start = rC.getStart(), end = rC.getEnd(), // Step directions stepX = rC.getDirection(start.x, end.x), stepY = rC.getDirection(start.y, end.y), // Boundary for largest movement point deltaX = Math.abs(end.x - start.x), deltaY = Math.abs(end.y - start.y), // deltaZ = Math.abs(end.z - start.z), // How many squares to advance in an increment (prevents reading corners) err = deltaX - deltaY; var x = start.x, y = start.y, valid = true, errCalc; for (var i = 0; i < 20; i++) { // Check for invalid tile if (rC.isBlocked(x, y)) { rC.setResult('Sight is blocked at ' + (x + 1) + ' ' + (y + 1)); break; } // Check for destination if (x === end.x && y === end.y) { rC.setResult('Valid line-of-sight'); break; } // Check error and increment x errCalc = 2 * err; if (errCalc > deltaY * -1) { err -= deltaY; x += stepX; } // Check for destination if (x === end.x && y === end.y) { rC.setResult('Valid line-of-sight'); break; } // Inrement y if (errCalc < deltaX) { err += deltaX; y += stepY; } } }
};
// Ray Casting API
var rC = { open: [], init: function () { this.bind(); }, bind: function () { $BTN_SIGHT.click(_event.isVisible); }, getStart: function () { return { x: parseInt($('#start-x').val() - 1, 10), y: parseInt($('#start-y').val() - 1, 10) }; }, getEnd: function () { return { x: parseInt($('#end-x').val() - 1, 10), y: parseInt($('#end-y').val() - 1, 10) }; }, // Get the direction between two points getDirection: function (a, b) { if (a < b) { return 1; } else { return -1; } }, setResult: function (message) { $('#result').html(message); }, isBlocked: function (x, y) { return map[y][x] === 0; }
};
rC.init();
// Output map
var $MAP = $('#map');
var map = [ [ 1, 1, 1, 1, 1, 1, 1, 1, 1 ], [ 1, 1, 1, 1, 1, 1, 1, 1, 1 ], [ 1, 1, 0, 0, 1, 1, 1, 1, 1 ], [ 1, 1, 0, 0, 1, 1, 1, 1, 1 ], [ 1, 1, 1, 1, 1, 1, 1, 1, 1 ], [ 1, 1, 1, 1, 1, 1, 1, 1, 1 ], [ 1, 1, 1, 1, 1, 1, 1, 1, 1 ], [ 1, 1, 1, 1, 1, 1, 1, 1, 1 ], [ 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
];
map.forEach(function (e) { $MAP.append(e.join(', ') + '<br/>');
});
Bresenham's Line of Sight - Script Codes
Bresenham's Line of Sight - Script Codes
Home Page Home
Developer Ash Blue
Username ashblue
Uploaded July 18, 2022
Rating 3
Size 2,881 Kb
Views 46,529
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