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fix: panning in a by CSS rotated plot doesn't work correctly #1585

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merged 1 commit into from
Mar 28, 2023
Merged

fix: panning in a by CSS rotated plot doesn't work correctly #1585

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45 changes: 42 additions & 3 deletions js/src/PanZoom.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,8 @@ import * as _ from 'underscore';

const nop = () => {};

const IS_CHROMIUM = navigator.userAgent.includes(' Chrome/');

export class PanZoom extends interaction.Interaction {
render() {
super.render();
Expand Down Expand Up @@ -99,8 +101,43 @@ export class PanZoom extends interaction.Interaction {
});
}

hasRotatedParent(element) {
const parent = element.parentNode;
/* Base case: the element has no parent or the parent is the <html> element */
if (!parent || parent.tagName === 'HTML') {
return false;
}

/* Check if the parent is rotated */
const computedStyle = window.getComputedStyle(parent);
const transform = computedStyle.getPropertyValue('transform');

if (transform !== 'none' && !transform.startsWith('matrix(1, 0, 0, 1')) {
return true;
}

/* Recursively check the parent's parent */
return this.hasRotatedParent(parent);
}

mousePos() {
if (this.use_css_rotation_workaround) {
const mouseEvent = window.event as MouseEvent;

/* the mouse position is only correct within this.el */
if (mouseEvent.target === this.el) {
this.last_mouse_pos = [mouseEvent.offsetX, mouseEvent.offsetY];
}
return this.last_mouse_pos;
} else {
return d3.mouse(this.el);
}
}

mousedown() {
this._mousedown(d3.mouse(this.el));
this.use_css_rotation_workaround =
!IS_CHROMIUM && this.hasRotatedParent(this.el);
this._mousedown(this.mousePos());
}

_mousedown(mouse_pos) {
Expand All @@ -125,7 +162,7 @@ export class PanZoom extends interaction.Interaction {
}

mousemove() {
this._mousemove(d3.mouse(this.el));
this._mousemove(this.mousePos());
}

_mousemove(mouse_pos) {
Expand Down Expand Up @@ -177,7 +214,7 @@ export class PanZoom extends interaction.Interaction {
const event = d3GetEvent();
event.preventDefault();
const delta = event.deltaY * -1;
const mouse_pos = d3.mouse(this.el);
const mouse_pos = this.mousePos();
this._zoom(mouse_pos, delta);
}
}
Expand Down Expand Up @@ -224,4 +261,6 @@ export class PanZoom extends interaction.Interaction {
scale_promises: any;
previous_pos: [number, number];
domains_in_order: { x: any[]; y: any[] };
last_mouse_pos = null;
use_css_rotation_workaround: boolean;
}