Revert "Feature: Multi Point Arrows (#338)" (#634)

This reverts commit 16263e942b.
This commit is contained in:
David Luzar 2020-01-31 18:56:55 +01:00 committed by GitHub
parent 16263e942b
commit 3d2e59bfed
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
19 changed files with 130 additions and 789 deletions

View file

@ -1,5 +1,3 @@
import { Point } from "roughjs/bin/geometry";
// https://stackoverflow.com/a/6853926/232122
export function distanceBetweenPointAndSegment(
x: number,
@ -54,66 +52,3 @@ export function rotate(
(x1 - x2) * Math.sin(angle) + (y1 - y2) * Math.cos(angle) + y2,
];
}
export const getPointOnAPath = (point: Point, path: Point[]) => {
const [px, py] = point;
const [start, ...other] = path;
let [lastX, lastY] = start;
let kLine: number = 0;
let idx: number = 0;
// if any item in the array is true, it means that a point is
// on some segment of a line based path
const retVal = other.some(([x2, y2], i) => {
// we always take a line when dealing with line segments
const x1 = lastX;
const y1 = lastY;
lastX = x2;
lastY = y2;
// if a point is not within the domain of the line segment
// it is not on the line segment
if (px < x1 || px > x2) {
return false;
}
// check if all points lie on the same line
// y1 = kx1 + b, y2 = kx2 + b
// y2 - y1 = k(x2 - x2) -> k = (y2 - y1) / (x2 - x1)
// coefficient for the line (p0, p1)
const kL = (y2 - y1) / (x2 - x1);
// coefficient for the line segment (p0, point)
const kP1 = (py - y1) / (px - x1);
// coefficient for the line segment (point, p1)
const kP2 = (py - y2) / (px - x2);
// because we are basing both lines from the same starting point
// the only option for collinearity is having same coefficients
// using it for floating point comparisons
const epsilon = 0.3;
// if coefficient is more than an arbitrary epsilon,
// these lines are nor collinear
if (Math.abs(kP1 - kL) > epsilon && Math.abs(kP2 - kL) > epsilon) {
return false;
}
// store the coefficient because we are goint to need it
kLine = kL;
idx = i;
return true;
});
// Return a coordinate that is always on the line segment
if (retVal === true) {
return { x: point[0], y: kLine * point[0], segment: idx };
}
return null;
};