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Steady Lines

pull straight strokes from dot to dot

round
score
best

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Pulling a line that does not wobble

Two dots, A and B. Press on A, pull one stroke across to B, lift. Six of them make a round, roughly forty seconds, and the pairs sit further apart as it goes on. Hitting A exactly is not part of it — a press anywhere inside the wide dashed circle is accepted and the line measured from where you actually landed. Your previous two attempts stay faintly on the sheet behind the new one, straight paths and all: redrawing over your own last try is the studio warm-up the whole drill is built out of.

What gets trained is the committed pull rather than the careful steer. The reveal overlays the true path, ticks the point of widest drift, and reads your stroke as a steady pull or as hesitant — a coaching note, never a penalty. At round end, if most of your lines bowed the same way, the drill names the tendency: a consistent curve belongs to the hand, not to the stroke. Running out of desk is not a fault: a stroke that stops well short of B — outside B’s end ring and under 88% of the way — is not scored at all, and a circle at the lift point lets you carry the same one on. Lift inside the ring and the stroke counts as arrived.

What counts as straight

The measurement is RMS perpendicular drift away from the straight A-to-B path, in pixels, graded in a band: under max(0.4% × |AB|, 3px) is a clean 100, and the score reaches zero at ease × max(5.5% × |AB|, 16px). Up to 20 points come off for missing B — the penalty reads the distance from your last sample to B, so overshooting or finishing wide costs exactly what stopping short does — and the round is the mean of the six. Ease is 1.0 for a pen, 1.5 for a finger and 2.0 for a mouse or trackpad, because a wrist-pivoted device cannot creep the way a nib can: the same 15px of wobble across a 300px pull is a fair mouse line and a careless pen one. None of it involves AI: the score is a closed-form calculation over the samples of your own stroke.

More line & hand drills: Full Circle · Ellipse Orbit · Draw Through · Mirror Mirror · the whole catalogue