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A linear dimension between two clicked points, or dragged out from a segment, always measured the straight distance between its points and drew its line parallel to them, so two points at different heights gave only a slanted dimension. The linear dimensions help describes aligned, horizontal and vertical linear dimensions: after the second click, clicking again gives an aligned one and moving the pointer gives a horizontal or vertical one. https://helpx.adobe.com/illustrator/desktop/measure-and-align/plot-and-measure/plot-linear-dimensions-of-objects.html While a linear dimension is being placed, the pointer's position sets whether it is aligned, horizontal or vertical. The rule is VectorCraft's own. With the pointer beside the two points (the nearest point of the line through them lies between them) or on that line, the dimension is aligned. Past either point, the line through the points and the perpendicular through that point bound a quarter on each side of the line. The quarter that holds the direction straight up or down gives the horizontal distance, and the quarter that holds the direction straight left or right gives the vertical distance. A click within reach of the second point, or of where the pointer was for the second click, places it aligned. Points on one horizontal or vertical line give an aligned dimension. The dimension stays linked to the anchors it measures. - Dimension recipes carry an orientation (aligned by default; files without it open as before). The line runs along the axis, and each extension line runs from its point to it. - dimension.create and dimension.update take orientation: aligned, horizontal or vertical, for linear dimensions only. Any other value is an error. A new orientation keeps the line on the side of the points it was on, and an update that changes nothing records no undo step. - A horizontal or vertical dimension keeps its orientation when it or the art it measures turns, and shows 0 when its points come into line across its axis. A line that lay outside the points stays outside them after a turn. - The hint bar names the two-click placement. Docs: docs/dimensions.md, the Evidence list in docs/target-app-parity.md.