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Allow selectZoom to be adaptive #67

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Allow selectZoom to be adaptive #67

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8d228cc
Implement adaptive selectZoom
janekfleper Aug 9, 2023
bed460f
Fix application of zoom onMouseUp event
janekfleper Apr 20, 2024
784e324
Improve selection conditions
janekfleper Apr 28, 2024
ca7b774
Add private properties for the select flags
janekfleper Apr 28, 2024
3e5b30e
Handle special case of equal width and height
janekfleper Apr 28, 2024
700df87
Rename w and h to width and height
janekfleper Apr 28, 2024
f029408
Add inputs for the select thresholds
janekfleper Apr 28, 2024
62c78b7
Merge branch 'huww98:master' into master
janekfleper Jun 10, 2024
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10 changes: 9 additions & 1 deletion demo/plugins/select.html
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,12 @@ <h1>Select & Zoom with Mouse</h1>

<label for="y">Y</label>
<input type="checkbox" id="y" name="y">

<label for="threshold-x">thresholdX</label>
<input type="number" size="4" id="threshold-x" name="thresholdX" value="20" min="0">

<label for="threshold-y">thresholdY</label>
<input type="number" size="4" id="threshold-y" name="thresholdY" value="20" min="0">
</form>

<script src="https://cdn.jsdelivr.net/npm/d3-array@3"></script>
Expand Down Expand Up @@ -54,9 +60,11 @@ <h1>Select & Zoom with Mouse</h1>

const form = document.querySelector('form');
function syncSelectZoom() {
const { x, y } = form;
const { x, y, thresholdX, thresholdY } = form;
chart.plugins.selectZoom.options.enableX = x.checked;
chart.plugins.selectZoom.options.enableY = y.checked;
chart.plugins.selectZoom.options.thresholdX = thresholdX.value;
chart.plugins.selectZoom.options.thresholdY = thresholdY.value;
}
form.addEventListener('change', syncSelectZoom);
syncSelectZoom();
Expand Down
71 changes: 39 additions & 32 deletions src/plugins_extra/selectZoom.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -5,13 +5,17 @@ export interface SelectZoomOptions {
mouseButtons: number;
enableX: boolean;
enableY: boolean;
thresholdX: number;
thresholdY: number;
cancelOnSecondPointer: boolean;
}

const defaultOptions = {
mouseButtons: 1,
enableX: true,
enableY: true,
thresholdX: 0,
thresholdY: 0,
cancelOnSecondPointer: false,
} as const;

Expand Down Expand Up @@ -50,6 +54,8 @@ export class SelectZoom {
}

private start: {p: Point, id: number} | null = null;
private selectX: boolean = false;
private selectY: boolean = false;

private reset() {
if (this.start === null)
Expand Down Expand Up @@ -95,21 +101,26 @@ export class SelectZoom {
return;
const p = this.getPoint(ev);

if (this.options.enableX) {
const x = Math.min(this.start.p.x, p.x);
const w = Math.abs(this.start.p.x - p.x);
const x = Math.min(this.start.p.x, p.x);
const y = Math.min(this.start.p.y, p.y);
const width = Math.abs(this.start.p.x - p.x);
const height = Math.abs(this.start.p.y - p.y);
const minWidth = Math.min(height, this.options.thresholdX);
const minHeight = Math.min(width, this.options.thresholdY);
this.selectX = width >= minWidth || !this.options.enableY;
this.selectY = height > minHeight || !this.options.enableX;

if (this.options.enableX && this.selectX) {
this.visual.x.baseVal.value = x;
this.visual.width.baseVal.value = w;
this.visual.width.baseVal.value = width;
} else {
this.visual.setAttribute('x', '0');
this.visual.setAttribute('width', '100%');
}

if (this.options.enableY) {
const y = Math.min(this.start.p.y, p.y);
const h = Math.abs(this.start.p.y - p.y);
if (this.options.enableY && this.selectY) {
this.visual.y.baseVal.value = y;
this.visual.height.baseVal.value = h;
this.visual.height.baseVal.value = height;
} else {
this.visual.setAttribute('y', '0');
this.visual.setAttribute('height', '100%');
Expand All @@ -121,33 +132,29 @@ export class SelectZoom {
return;

const p = this.getPoint(ev);
const x1 = Math.min(this.start.p.x, p.x);
const x2 = Math.max(this.start.p.x, p.x);
const y1 = Math.max(this.start.p.y, p.y);
const y2 = Math.min(this.start.p.y, p.y);

let changed = false;
if (this.options.enableX) {
const x1 = Math.min(this.start.p.x, p.x);
const x2 = Math.max(this.start.p.x, p.x);
if (x2 - x1 > 0) {
const newDomain = [
this.chart.model.xScale.invert(x1),
this.chart.model.xScale.invert(x2),
];
this.chart.model.xScale.domain(newDomain);
this.chart.options.xRange = null;
changed = true;
}
if (this.options.enableX && this.selectX && x2 != x1) {
const newDomain = [
this.chart.model.xScale.invert(x1),
this.chart.model.xScale.invert(x2),
];
this.chart.model.xScale.domain(newDomain);
this.chart.options.xRange = null;
changed = true;
}
if (this.options.enableY) {
const y1 = Math.max(this.start.p.y, p.y);
const y2 = Math.min(this.start.p.y, p.y);
if (y1 - y2 > 0) {
const newDomain = [
this.chart.model.yScale.invert(y1),
this.chart.model.yScale.invert(y2),
];
this.chart.model.yScale.domain(newDomain);
this.chart.options.yRange = null;
changed = true;
}
if (this.options.enableY && this.selectY && y2 != y1) {
const newDomain = [
this.chart.model.yScale.invert(y1),
this.chart.model.yScale.invert(y2),
];
this.chart.model.yScale.domain(newDomain);
this.chart.options.yRange = null;
changed = true;
}
if (changed)
this.chart.model.requestRedraw();
Expand Down