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63 lines
2.8 KiB
HTML
63 lines
2.8 KiB
HTML
<!doctype html>
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<meta charset="utf-8">
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<title>25 pointer continuity</title>
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<link rel="stylesheet" href="../_style.css">
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<script src="../_lib.js"></script>
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<body>
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<main>
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<p>Goal: click <b>A</b>, then click <b>B</b>. Page requires pointer continuity:
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between the two clicks there must be intermediate <code>pointermove</code> events
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whose path roughly connects the two click points (no teleport). Two clicks
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>100px apart with zero moves between is a synthetic-bridge tell.</p>
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<div style="display:flex;justify-content:space-between;margin-top:20px">
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<button id="a" style="padding:14px 22px;background:#36c;color:#fff;border:0;border-radius:6px">A</button>
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<div style="flex:1"></div>
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<button id="b" style="padding:14px 22px;background:#c36;color:#fff;border:0;border-radius:6px">B</button>
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</div>
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</main>
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<script>
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Challenge.init({ id: "pointer-continuity", instructions: "click A, move mouse to B, click B" });
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const a = document.getElementById("a");
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const b = document.getElementById("b");
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const moves = [];
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window.addEventListener("pointermove", (e) => {
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moves.push({ x: e.clientX, y: e.clientY, t: e.timeStamp });
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if (moves.length > 500) moves.shift();
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});
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let aClickTs = 0, aPoint = null;
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a.addEventListener("click", (e) => {
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if (!e.isTrusted) return Challenge.fail("A click isTrusted=false");
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aClickTs = e.timeStamp;
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aPoint = { x: e.clientX, y: e.clientY };
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Challenge.log("A click", aPoint);
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});
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b.addEventListener("click", (e) => {
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if (!aClickTs) return Challenge.fail("B clicked before A");
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if (!e.isTrusted) return Challenge.fail("B click isTrusted=false");
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const bPoint = { x: e.clientX, y: e.clientY };
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const between = moves.filter(m => m.t > aClickTs && m.t < e.timeStamp);
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Challenge.log("B click", { bPoint, betweenCount: between.length });
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const dist = Math.hypot(bPoint.x - aPoint.x, bPoint.y - aPoint.y);
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if (dist < 100) return Challenge.fail(`A-B distance only ${dist.toFixed(0)}px — buttons should be further apart in viewport`);
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if (between.length < 5) return Challenge.fail(`only ${between.length} pointermove(s) between A and B (need ≥5)`);
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// Path coverage: at least some intermediate move must be ≥30% of the way across.
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const inSpan = between.filter(m => {
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const px = (m.x - aPoint.x) / (bPoint.x - aPoint.x || 1);
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return px > 0.25 && px < 0.75;
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});
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if (inSpan.length === 0) return Challenge.fail("no pointermove samples in mid-span between A and B (teleport)");
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// Move timestamps should be spread, not bunched in <20ms.
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const span = between[between.length-1].t - between[0].t;
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if (span < 30) return Challenge.fail(`pointermoves bunched in ${span.toFixed(0)}ms (need spread ≥30ms)`);
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Challenge.pass(`${between.length} moves bridging A→B over ${span.toFixed(0)}ms, dist=${dist.toFixed(0)}px`);
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});
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</script>
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</body>
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