引导画圆挑战
引导画圆挑战为你提供一条柔和的辅助圆，模拟工业绘图中常见的描线练习。你需要沿着这条参照轨迹，以连贯的手势勾勒出自己的圆形，目标是在有限时间内实现边缘贴合与弧度一致，是培养视觉判断与手部控制的理想模式。
正式开始前，不妨先观察辅助圆的直径、起笔位置以及画布中心。保持身体稳定，将前臂轻轻支撑在桌面上，让书记动作来自肩肘联动而非指尖抖动，可有效降低偏移。若你在移动端体验，可调整屏幕倾角，寻找最容易保持视线垂直的姿势。
系统会依据你绘制的实际轨迹与理想圆之间的偏差，持续计算即时得分。完成后，我们会对整个路径进行半径方差评估，并给出0到100的精准数值与模拟全球排名。想进入前1%，不仅要贴近辅助圆，还需确保起点与终点精准重合。
建议在多轮练习中切换不同的速度与起点方位，记录哪种节奏最稳定。不断重复会让你更熟悉圆周运动的节奏感，也能帮助理解设计绘图中“慢线条易抖、快线条难控”的平衡法则。准备好迎接挑战了吗？
The Guided Circle Challenge places a faint reference ring beneath your cursor, much like tracing paper exercises in product sketching classes. Your mission is to glide along that scaffold, matching its curvature while maintaining a single, unbroken stroke that feels natural rather than mechanical.
Before you press start, study the diameter, entry point, and centre alignment of the guide. Anchor your forearm gently on the desk so the motion originates from the shoulder and elbow, keeping micro tremors in check. When working on a phone or tablet, adjust the viewing angle until the circle sits squarely within your field of vision.
Our scoring engine monitors deviations from the ideal path in real time and, once you complete the loop, calculates radius variance to deliver a precise score between 0 and 100. To reach the simulated top 1%, you must hug the guide closely while letting the starting and ending points meet seamlessly.
Experiment with various speeds and starting quadrants to discover the tempo that keeps your line stable. Over time you will internalise the rhythm of circular motion and develop muscle memory that translates to technical drawing, lettering, and interface sketching. Take a breath, commit to the arc, and see how steady you can stay.
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