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WIP: Selections at frontend #227

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WIP: Selections at frontend #227

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faedc31
inside testing in selectors at frontend
maartenbreddels Feb 7, 2019
601369f
missing ;'
maartenbreddels Feb 7, 2019
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118 changes: 114 additions & 4 deletions js/src/selectors.js
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Original file line number Diff line number Diff line change
Expand Up @@ -3,13 +3,99 @@ var _scale_point = function (xy, width, height) {
return [xy[0] / width * 2 - 1, 1 - xy[1] / height * 2];
};

function points_in_lasso (vertx, verty, x, y) {
let meanx = 0;
let meany = 0;
let N = x.length;
let Nvert = vertx.length;
for (let i = 0; i < Nvert; i++) {
meanx += vertx[i];
meany += verty[i];
}
meanx /= Nvert;
meany /= Nvert;
let radius_squared = 0;
for (let i = 0; i < Nvert; i++) {
let rx = vertx[i] - meanx;
let ry = verty[i] - meany;
radius_squared = Math.max(radius_squared, rx*rx + ry*ry);
}
let mask = new Uint8Array(N);
let indices = new Uint32Array(N);
let count = 0;
for (let k = 0; k < N; k++) {
let testx = x[k];
let testy = y[k];
let i, j;
let is_inside = false;
mask[k] = 0;
let distancesq = Math.pow(testx - meanx, 2) + Math.pow(testy - meany, 2);
if (distancesq < radius_squared) {
for (i = 0, j = Nvert-1; i < Nvert; j = i++) {
if (((verty[i]>testy) !== (verty[j]>testy)) &&
(testx < (vertx[j]-vertx[i]) * (testy-verty[i]) / (verty[j]-verty[i]) + vertx[i])) {
is_inside = !is_inside;
}
}
mask[k] = is_inside ? 1 : 0;
if (is_inside) {
indices[count++] = k;
}
}
}
indices = indices.slice(0, count);
return { mask: mask, indices: indices };
}

export
class Selector {
points_inside (x, y) {
const N = x.length;
let mask = new Uint8Array(N);
for (let k = 0; k < N; k++) {
mask[k] = this.point_inside(x[k], y[k]) ? 1 : 0;
}
return mask;
}
indices_inside (x, y) {
const N = x.length;
let indices = new Uint32Array(N);
let count = 0;
for (let k = 0; k < N; k++) {
if (this.point_inside(x[k], y[k])) {
indices[count++] = k;
}
}
indices = indices.slice(0, count);
return indices;
}
};

export
class LassoSelector {
class LassoSelector extends Selector {
constructor (canvas) {
super();
this.canvas = canvas;
this.points = [];
}

_get_vertices () {
return { vx: this.points.map(p => p[0]), vy: this.points.map(p => p[1]) };
}
point_inside (x, y) {
let { vx, vy } = this._get_vertices();
let { mask } = points_in_lasso(vx, vy, [x], [y]);
return mask[0] === 1;
}
points_inside (x, y) {
let { vx, vy } = this._get_vertices();
let { mask } = points_in_lasso(vx, vy, x, y);
return mask;
}
indices_inside (x, y) {
let { vx, vy } = this._get_vertices();
let { indices } = points_in_lasso(vx, vy, x, y);
return indices;
}
mouseMove (x, y) {
this.points.push([x, y]);
}
Expand Down Expand Up @@ -40,13 +126,24 @@ class LassoSelector {
}

export
class CircleSelector {
class CircleSelector extends Selector {
constructor (canvas) {
super();
this.canvas = canvas;
this.points = [];
this.begin = null;
this.end = null;
}
point_inside (x, y) {
if (this.begin === null || this.end === null) {
return false;
}
let [x1, y1] = this.begin;
let [x2, y2] = this.end;
let radius_squared = Math.pow(x1 - x2, 2) + Math.pow(y1 - y2, 2);
let distance_squared = Math.pow(x - x1, 2) + Math.pow(y - y1, 2);
return distance_squared < radius_squared;
}
mouseMove (x, y) {
if (!this.begin) {
this.begin = [x, y];
Expand Down Expand Up @@ -85,13 +182,26 @@ class CircleSelector {
}

export
class RectangleSelector {
class RectangleSelector extends Selector {
constructor (canvas) {
super();
this.canvas = canvas;
this.points = [];
this.begin = null;
this.end = null;
}
point_inside (x, y) {
if (this.begin === null || this.end === null) {
return false;
}
let [x1, y1] = this.begin;
let [x2, y2] = this.end;
let xmin = Math.min(x1, x2);
let ymin = Math.min(y1, y2);
let xmax = Math.max(x1, x2);
let ymax = Math.max(y1, y2);
return (x > xmin) && (x < xmax) && (y > ymin) && (y < ymax);
}
mouseMove (x, y) {
if (!this.begin) {
this.begin = [x, y];
Expand Down
15 changes: 15 additions & 0 deletions js/test/selectors.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,11 @@ describe("Selector", () => {
expect(path_data['device']).to.deep.equals([[-1, 1], [1, 1], [-1, -1]])
expect(path_data['type']).to.equal('lasso');

expect(selector.point_inside(2, 2)).to.be.true;
expect(selector.point_inside(10, 10)).to.be.false;
expect([...selector.points_inside([2, 10], [2, 10])]).to.deep.equals([1, 0])
expect([...selector.indices_inside([2, 10], [2, 10])]).to.deep.equals([0])

selector.close()
data_inside = context.getImageData(2,2,1,1)
data_outside = context.getImageData(10,10,1,1)
Expand Down Expand Up @@ -52,6 +57,11 @@ describe("Selector", () => {
expect(path_data['device']['end']).to.deep.equals([0, 1])
expect(path_data['type']).to.equal('circle');

expect(selector.point_inside(2, 2)).to.be.true;
expect(selector.point_inside(10, 10)).to.be.false;
expect([...selector.points_inside([2, 10], [2, 10])]).to.deep.equals([1, 0])
expect([...selector.indices_inside([2, 10], [2, 10])]).to.deep.equals([0])

selector.mouseMove(0, 10);
path_data = selector.getData(10, 10)
expect(path_data['pixel']['begin']).to.deep.equals([0, 0])
Expand Down Expand Up @@ -87,6 +97,11 @@ describe("Selector", () => {
expect(path_data['device']['end']).to.deep.equals([0, 0])
expect(path_data['type']).to.equal('rectangle');

expect(selector.point_inside(2, 2)).to.be.true;
expect(selector.point_inside(10, 10)).to.be.false;
expect([...selector.points_inside([2, 10], [2, 10])]).to.deep.equals([1, 0])
expect([...selector.indices_inside([2, 10], [2, 10])]).to.deep.equals([0])

selector.mouseMove(5, 10);
path_data = selector.getData(10, 10)
expect(path_data['pixel']['begin']).to.deep.equals([0, 0])
Expand Down