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Give edges a minimum length

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This means short edges like adjunctions and pullbacks can now be manipulated more easily.
This commit is contained in:
varkor 2019-01-15 16:43:44 +00:00
parent 9599d3f030
commit 726fd39be9
1 changed files with 10 additions and 4 deletions
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14
src/ui.js
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@ -3331,6 +3331,10 @@ class Edge extends Cell {
const EDGE_PADDING = 4;
// How much space to leave between the cells this edge spans. (Less for other edges.)
let MARGIN = level === 1 ? ui.cell_size / 4 : ui.cell_size / 8;
// The minimum length of the `element`. This is defined so that very small edges (e.g.
// adjunctions or pullbacks) are still large enough to manipulate by clicking on them or
// their handles.
const MIN_LENGTH = 72;
// The SVG for the arrow itself.
const offset_delta = ui.offset_from_position(
@ -3350,11 +3354,13 @@ class Edge extends Cell {
const { dimensions, alignment } = Edge.draw_edge(svg, options, length, gap, true);
const clamped_width = Math.min(Math.max(dimensions.width, MIN_LENGTH), length);
if (background !== null) {
background.setAttribute("width", dimensions.width);
background.setAttribute("width", clamped_width);
background.setAttribute("height", dimensions.height + EDGE_PADDING * 2);
background.appendChild(new DOM.SVGElement("path", {
d: `M 0 ${EDGE_PADDING + dimensions.height / 2} l ${dimensions.width} 0`,
d: `M 0 ${EDGE_PADDING + dimensions.height / 2} l ${clamped_width} 0`,
}, {
strokeWidth: `${dimensions.height + EDGE_PADDING * 2}px`,
}).element);
@ -3363,7 +3369,7 @@ class Edge extends Cell {
// If the arrow is shorter than expected (for example, because we are using a
// fixed-width arrow style), then we need to make sure that it's still centred
// if the `alignment` is `"centre"`.
const width_shortfall = length + SVG_PADDING * 2 - dimensions.width;
const width_shortfall = length + SVG_PADDING * 2 - clamped_width;
let margin_adjustment;
switch (alignment) {
case "left":
@ -3385,7 +3391,7 @@ class Edge extends Cell {
element.style.left = `${source_offset.left + Math.cos(direction) * margin}px`;
element.style.top = `${source_offset.top + Math.sin(direction) * margin}px`;
[element.style.width, element.style.height]
= new Offset(dimensions.width, dimensions.height + EDGE_PADDING * 2).to_CSS();
= new Offset(clamped_width, dimensions.height + EDGE_PADDING * 2).to_CSS();
element.style.transformOrigin
= `${SVG_PADDING}px ${dimensions.height / 2 + EDGE_PADDING}px`;
element.style.transform = `