The drawing controls lived in a strip above the chart while the lines they
created were listed in the sidebar — two places for one concern, and the strip
cost vertical space the chart wanted.
The sidebar now carries a tool per object, each with its own parameters. A tool
head arms the tool; the gesture happens on the chart:
- Price level: press anywhere, drag to fine-tune, release. A tag follows the
cursor showing the price snapped to the 0.25 tick, and that snapped value is
exactly what gets committed.
- Trendline: press at one end, drag, release at the other. One gesture where it
used to be two separate clicks and a "place first point / place second point"
prompt.
Dragging from the palette itself was the other candidate and was rejected: a
price level is a one-point object and drops cleanly, but a trendline needs two
points, so it would still have wanted a second click afterwards and the two
tools would have behaved differently for no visible reason.
Panning and scaling are suspended while a tool is armed, or the drag that draws
a line also drags the chart out from under it. Arming survives exactly one
placement, so a stray drag afterwards cannot create a second object.
Typing an exact price stays, next to the drag: "somewhere around here" and
"exactly 7800" are different intents and both are cheap to support.
Verified by driving headless Chrome over CDP rather than by reading: arming sets
the class, the live tag reads 7770.75 mid-drag, the committed level is 7770.75
with zero slope, the trendline rubber-bands and saves with a real slope, and
both tools disarm afterwards.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Chris Amow
d5edb12171