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Ingy döt Net 2026-02-01 16:33:20 -08:00
parent 5150844a7d
commit 4bb20c9b71
7735 changed files with 38060 additions and 199180 deletions
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93
Task/Convex-hull/Haxe/convex-hull.haxe
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@ -1,93 +0,0 @@
typedef Point = {x:Float, y:Float};
class Main {
// Calculate orientation for 3 points
// 0 -> Straight line
// 1 -> Clockwise
// 2 -> Counterclockwise
static function orientation(pt1:Point, pt2:Point, pt3:Point): Int
{
var val = ((pt2.x - pt1.x) * (pt3.y - pt1.y)) -
((pt2.y - pt1.y) * (pt3.x - pt1.x));
if (val == 0)
return 0;
else if (val > 0)
return 1;
else return 2;
}
static function convexHull(pts:Array<Point>):Array<Point> {
var result = new Array<Point>();
// There must be at least 3 points
if (pts.length < 3)
for (i in pts) result.push(i);
// Find the leftmost point
var indexMinX = 0;
for (i in 0...(pts.length - 1))
if (pts[i].x < pts[indexMinX].x)
indexMinX = i;
var p = indexMinX;
var q = 0;
while (true) {
// The leftmost point must be part of the hull.
result.push(pts[p]);
q = (p + 1) % pts.length;
for (i in 0...(pts.length - 1))
if (orientation(pts[p], pts[i], pts[q]) == 2) q = i;
p = q;
// Break from loop once we reach the first point again.
if (p == indexMinX)
break;
}
return result;
}
static function main() {
var pts = new Array<Point>();
pts.push({x: 16, y: 3});
pts.push({x: 12, y: 17});
pts.push({x: 0, y: 6});
pts.push({x: -4, y: -6});
pts.push({x: 16, y: 6});
pts.push({x: 16, y: -7});
pts.push({x: 16, y: -3});
pts.push({x: 17, y: -4});
pts.push({x: 5, y: 19});
pts.push({x: 19, y: -8});
pts.push({x: 3, y: 16});
pts.push({x: 12, y: 13});
pts.push({x: 3, y: -4});
pts.push({x: 17, y: 5});
pts.push({x: -3, y: 15});
pts.push({x: -3, y: -9});
pts.push({x: 0, y: 11});
pts.push({x: -9, y: -3});
pts.push({x: -4, y: -2});
pts.push({x: 12, y: 10});
var hull = convexHull(pts);
Sys.print('Convex Hull: [');
var length = hull.length;
var i = 0;
while (length > 0) {
if (i > 0)
Sys.print(', ');
Sys.print('(${hull[i].x}, ${hull[i].y})');
length--;
i++;
}
Sys.println(']');
}
}