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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 | import { IDistance, IPoints, ITouchPoints } from '../../types';
import { Types } from '@cornerstonejs/core';
/**
* Returns the difference between multiple `IPoints` instances.
* @param currentPoints - The current points.
* @param lastPoints - The last points, to be subtracted from the `currentPoints`.
*
* @returns The difference in IPoints format
*/
function getDeltaPoints(
currentPoints: IPoints[],
lastPoints: IPoints[]
): IPoints {
const curr = getMeanPoints(currentPoints);
const last = getMeanPoints(lastPoints);
return {
page: _subtractPoints2D(curr.page, last.page),
client: _subtractPoints2D(curr.client, last.client),
canvas: _subtractPoints2D(curr.canvas, last.canvas),
world: _subtractPoints3D(curr.world, last.world),
};
}
/**
* Returns the distance between multiple `IPoints` instances.
* @param currentPoints - The current points.
* @param lastPoints - The last points, to be subtracted from the `currentPoints`.
*
* @returns The distance difference in IDistance format
*/
function getDeltaDistance(
currentPoints: IPoints[],
lastPoints: IPoints[]
): IDistance {
const curr = getMeanPoints(currentPoints);
const last = getMeanPoints(lastPoints);
return {
page: _getDistance2D(curr.page, last.page),
client: _getDistance2D(curr.client, last.client),
canvas: _getDistance2D(curr.canvas, last.canvas),
world: _getDistance3D(curr.world, last.world),
};
}
function getDeltaRotation(
currentPoints: ITouchPoints[],
lastPoints: ITouchPoints[]
) {
// TODO
}
/**
* Returns the distance difference between multiple `IPoints` instances.
* @param currentPoints - The current points.
* @param lastPoints -- The last points.
*
* @returns The difference in IPoints format
*/
function getDeltaDistanceBetweenIPoints(
currentPoints: IPoints[],
lastPoints: IPoints[]
): IDistance {
const currentDistance = _getMeanDistanceBetweenAllIPoints(currentPoints);
const lastDistance = _getMeanDistanceBetweenAllIPoints(lastPoints);
const deltaDistance = {
page: currentDistance.page - lastDistance.page,
client: currentDistance.client - lastDistance.client,
canvas: currentDistance.canvas - lastDistance.canvas,
world: currentDistance.world - lastDistance.world,
};
return deltaDistance;
}
/**
* Copies a set of points.
* @param points - The `IPoints` instance to copy.
*
* @returns A copy of the points.
*/
function copyPointsList(points: ITouchPoints[]): ITouchPoints[] {
return JSON.parse(JSON.stringify(points));
}
function copyPoints(points: ITouchPoints): ITouchPoints {
return JSON.parse(JSON.stringify(points));
}
function getMeanPoints(points: IPoints[]): IPoints {
return points.reduce(
(prev, curr) => {
return {
page: [
prev.page[0] + curr.page[0] / points.length,
prev.page[1] + curr.page[1] / points.length,
],
client: [
prev.client[0] + curr.client[0] / points.length,
prev.client[1] + curr.client[1] / points.length,
],
canvas: [
prev.canvas[0] + curr.canvas[0] / points.length,
prev.canvas[1] + curr.canvas[1] / points.length,
],
world: [
prev.world[0] + curr.world[0] / points.length,
prev.world[1] + curr.world[1] / points.length,
prev.world[2] + curr.world[2] / points.length,
],
};
},
{
page: [0, 0],
client: [0, 0],
canvas: [0, 0],
world: [0, 0, 0],
}
);
}
function getMeanTouchPoints(points: ITouchPoints[]): ITouchPoints {
return points.reduce(
(prev, curr) => {
return {
page: [
prev.page[0] + curr.page[0] / points.length,
prev.page[1] + curr.page[1] / points.length,
],
client: [
prev.client[0] + curr.client[0] / points.length,
prev.client[1] + curr.client[1] / points.length,
],
canvas: [
prev.canvas[0] + curr.canvas[0] / points.length,
prev.canvas[1] + curr.canvas[1] / points.length,
],
world: [
prev.world[0] + curr.world[0] / points.length,
prev.world[1] + curr.world[1] / points.length,
prev.world[2] + curr.world[2] / points.length,
],
touch: {
identifier: null,
radiusX: prev.touch.radiusX + curr.touch.radiusX / points.length,
radiusY: prev.touch.radiusY + curr.touch.radiusY / points.length,
force: prev.touch.force + curr.touch.force / points.length,
rotationAngle:
prev.touch.rotationAngle + curr.touch.rotationAngle / points.length,
},
};
},
{
page: [0, 0],
client: [0, 0],
canvas: [0, 0],
world: [0, 0, 0],
touch: {
identifier: null,
radiusX: 0,
radiusY: 0,
force: 0,
rotationAngle: 0,
},
}
);
}
/**
* _subtractPoints - Subtracts `point1` from `point0`.
* @param point0 - The first point.
* @param point1 - The second point to subtract from the first.
*
* @returns The difference.
*/
function _subtractPoints2D(
point0: Types.Point2,
point1: Types.Point2
): Types.Point2 {
return [point0[0] - point1[0], point0[1] - point1[1]];
}
function _subtractPoints3D(
point0: Types.Point3,
point1: Types.Point3
): Types.Point3 {
return [point0[0] - point1[0], point0[1] - point1[1], point0[2] - point1[2]];
}
function _getMeanDistanceBetweenAllIPoints(points: IPoints[]): IDistance {
// get mean distance between all unordered pairs of points
const pairedDistance: IDistance[] = [];
for (let i = 0; i < points.length; i++) {
for (let j = 0; j < points.length; j++) {
if (i < j) {
pairedDistance.push({
page: _getDistance2D(points[i].page, points[j].page),
client: _getDistance2D(points[i].client, points[j].client),
canvas: _getDistance2D(points[i].canvas, points[j].canvas),
world: _getDistance3D(points[i].world, points[j].world),
});
}
}
}
// take the average distance
return pairedDistance.reduce(
(prev, curr) => {
return {
page: prev.page + curr.page / pairedDistance.length,
client: prev.client + curr.client / pairedDistance.length,
canvas: prev.canvas + curr.canvas / pairedDistance.length,
world: prev.world + curr.world / pairedDistance.length,
};
},
{
page: 0,
client: 0,
canvas: 0,
world: 0,
}
);
}
function _getDistance2D(point0: Types.Point2, point1: Types.Point2): number {
return Math.sqrt(
Math.pow(point0[0] - point1[0], 2) + Math.pow(point0[1] - point1[1], 2)
);
}
function _getDistance3D(point0: Types.Point3, point1: Types.Point3): number {
return Math.sqrt(
Math.pow(point0[0] - point1[0], 2) +
Math.pow(point0[1] - point1[1], 2) +
Math.pow(point0[2] - point1[2], 2)
);
}
export {
getMeanPoints,
getMeanTouchPoints,
copyPoints,
copyPointsList,
getDeltaDistanceBetweenIPoints,
getDeltaPoints,
getDeltaDistance,
getDeltaRotation,
};
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