54 lines
1.7 KiB
HTML
54 lines
1.7 KiB
HTML
|
<body></body>
|
||
|
|
<script>
|
||
|
|
//计算凸包
|
||
|
|
function convex_hull(points) {
|
||
|
|
var points = [
|
||
|
|
{ x: 0, y: 0 }, { x: 1, y: 1 }, { x: 2, y: 2 },
|
||
|
|
{ x: 0, y: 3 }, { x: 3, y: 0 }, { x: 3, y: 3 },
|
||
|
|
{ x: 2, y: 1 }, { x: 1, y: 2 }
|
||
|
|
];
|
||
|
|
//长度
|
||
|
|
var n = points.length;
|
||
|
|
var pointsPtr = Module._malloc(n * 8); //8字节一个点
|
||
|
|
|
||
|
|
for (let i = 0; i < n; i++) {
|
||
|
|
Module.setValue(pointsPtr + i * 8, points[i].x, 'i32');
|
||
|
|
Module.setValue(pointsPtr + i * 8 + 4, points[i].y, 'i32');
|
||
|
|
}
|
||
|
|
//多少点
|
||
|
|
var resultPtr = Module._malloc(n * 8);
|
||
|
|
var resultSizePtr = Module._malloc(4);
|
||
|
|
Module._convexHull(pointsPtr, n, resultPtr, resultSizePtr);
|
||
|
|
var resultSize = Module.getValue(resultSizePtr, 'i32');
|
||
|
|
var resultPoints = [];
|
||
|
|
//读
|
||
|
|
for (let i = 0; i < resultSize; i++) {
|
||
|
|
var x = Module.getValue(resultPtr + i * 8, 'i32');
|
||
|
|
var y = Module.getValue(resultPtr + i * 8 + 4, 'i32');
|
||
|
|
resultPoints.push({ x: x, y: y });
|
||
|
|
}
|
||
|
|
console.log(resultPoints);
|
||
|
|
|
||
|
|
// 释放
|
||
|
|
Module._free(pointsPtr);
|
||
|
|
Module._free(resultPtr);
|
||
|
|
Module._free(resultSizePtr);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
//loadwasm
|
||
|
|
function loadwasm() {
|
||
|
|
var wasm_url = "./convex_hull.js";
|
||
|
|
var script = document.createElement('script');
|
||
|
|
script.src = wasm_url;
|
||
|
|
script.onload = function () {
|
||
|
|
//loadwasm
|
||
|
|
console.log(Module)
|
||
|
|
Module.onRuntimeInitialized = function () {
|
||
|
|
convex_hull()
|
||
|
|
}
|
||
|
|
}
|
||
|
|
document.body.appendChild(script);
|
||
|
|
}
|
||
|
|
loadwasm()
|
||
|
|
</script>
|