56 lines
1.3 KiB
JavaScript
56 lines
1.3 KiB
JavaScript
import { DrawFunction } from './function';
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import { drawLine } from './utils';
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import { ALT_SPECIAL_VALUE } from '../constants';
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import State from '../state';
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import Vector from '../vector';
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/**
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* @implements {DrawFunction}
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*/
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export default class DrawLine {
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/**
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* @param {State} state
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* @param {boolean} isArrow
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*/
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constructor(state, isArrow) {
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this.state = state;
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this.isArrow = isArrow;
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/** @type {Vector} */ this.startPosition = null;
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}
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/** @inheritDoc */
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start(position) {
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this.startPosition = position;
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}
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/** @inheritDoc */
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move(position) {
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this.state.clearDraw();
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// Try to infer line orientation.
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// TODO: Split the line into two lines if we can't satisfy both ends.
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var startContext = this.state.getContext(this.startPosition);
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var endContext = this.state.getContext(position);
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var clockwise = (startContext.up && startContext.down) ||
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(endContext.left && endContext.right);
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drawLine(this.state, this.startPosition, position, clockwise);
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if (this.isArrow) {
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this.state.drawValue(position, ALT_SPECIAL_VALUE);
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}
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}
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/** @inheritDoc */
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end() {
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this.state.commitDraw();
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}
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/** @inheritDoc */
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getCursor(position) {
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return 'crosshair';
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}
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/** @inheritDoc */
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handleKey(value) {};
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}
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