Anonymous user
Ray-casting algorithm: Difference between revisions
→{{header|Javascript}}
Line 1,696:
*/
function west(A, B, x, y) {
if (A.y <= B.y) {
if (y < A.y || y > B.y ||
x >= A.x && x >= B.x) {
Line 1,708:
return west(B, A, x, y);
}
}
}
var square = {name: 'square', bounds: [{x: 0, y: 0}, {x: 20, y: 0}, {x: 20, y: 20}, {x: 0, y: 20}]};
var squareHole = {
name: 'squareHole',
bounds: [{x: 0, y: 0}, {x: 20, y: 0}, {x: 20, y: 20}, {x: 0, y: 20}, {x: 5, y: 5}, {x: 15, y: 5}, {x: 15, y: 15}, {x: 5, y: 15}]
};
var strange = {
name: 'strange',
bounds: [{x: 0, y: 0}, {x: 5, y: 5}, {x: 0, y: 20}, {x: 5, y: 15}, {x: 15, y: 15}, {x: 20, y: 20}, {x: 20, y: 0}]
};
var hexagon = {
name: 'hexagon',
bounds: [{x: 6, y: 0}, {x: 14, y: 0}, {x: 20, y: 10}, {x: 14, y: 20}, {x: 6, y: 20}, {x: 0, y: 10}]
};
var shapes = [square, squareHole, strange, hexagon];
var testPoints = [{lng: 10, lat: 10}, {lng: 10, lat: 16}, {lng: -20, lat: 10},
{lng: 0, lat: 10}, {lng: 20, lat: 10}, {lng: 16, lat: 10}, {lng: 20, lat: 20}];
for (var s = 0; s < shapes.length; s++) {
var shape = shapes[s];
for (var tp = 0; tp < testPoints.length; tp++) {
var testPoint = testPoints[tp];
console.log(JSON.stringify(testPoint) + '\tin ' + shape.name + '\t' + contains(shape.bounds, testPoint.lat, testPoint.lng));
}
}
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