盲绘画圆挑战
盲绘画圆挑战要求你在完全看不到笔迹的情况下，用一气呵成的移动画出尽可能接近圆形的轮廓。这个模式源自手绘训练营，强调肌肉记忆与空间感的协同，尤其考验你在缺乏视觉反馈时的手部控制力。
按下“开始挑战”后，画布会立即进入隐藏状态，你的每一次轻微抖动都会被算法记录。建议保持手腕放松、呼吸稳定，先在脑中预演圆心位置，再以均匀速度绕行，这样能让路径更加匀称，减少因停顿或回拉导致的评分扣减。
如果你使用触控笔或鼠标，也可在正式落笔前用悬空动作预热几次，确认起笔与收笔的方向一致。回放阶段系统会对所有轨迹点进行平均半径分析，并给出0到100的精确得分，同时呈现模拟全球排名，帮助你比对当前水平。
建议多次尝试并记录最佳成绩，观察每次绘制时的姿势与握笔力度差异。持续练习不仅能提升圆的完整度，还能训练眼手协调与身体感知，对插画、工业设计乃至书法练习都大有裨益。
The Blind Circle Challenge invites you to rely purely on spatial awareness and muscle memory as the canvas hides every stroke you make. This exercise mirrors traditional atelier drills where artists close their eyes to trace shapes, forcing the brain to maintain a mental map of centre, radius, and rotation without any visual hints.
Once you hit “Start Challenge”, the board turns blank and the algorithm quietly captures each inflection in your movement. Keep your wrist loose, breathe steadily, and decide on a centre point before you begin the orbit. A smooth, even pace prevents hesitant corners and keeps the curve from spiralling inward or outward.
Whether you draw with a stylus or mouse, rehearse the path with a few invisible warm-up loops so that the entry and exit points align. When you finish, the system reconstructs your hidden path, evaluates the average radius, and returns a 0–100 score with a simulated global ranking so you can benchmark growth.
Repeat the drill and track how posture, grip, and tempo affect the outline. Consistent practice sharpens proprioception, improves coordination, and pays dividends in illustration, industrial sketching, and calligraphy work where confident arcs are crucial. Embrace the uncertainty and let your internal compass lead the way.
玩法说明：屏幕隐藏笔迹后，保持固定圆心与稳定半径，不要中途停笔或回拉。建议先在脑中规划圆的大小，再一次性完成闭环。
评分算法：系统会统计轨迹点到圆心的半径波动，并按方差与闭合误差折算得分。半径越一致、收笔越贴合，得分越高。
常见问题：若分数偏低，多半是手速忽快忽慢或偏离圆心。放慢速度、缩短半径、保持肩肘联动会明显改善。
适用场景：适合插画、工业设计、书法训练等需要稳定弧线的练习，也可作为课堂专注力与肌肉记忆训练。
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