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ControllerPanZoom.js.html
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<h1 class="page-title">Source: ControllerPanZoom.js</h1>
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<pre
class="sunlight-highlight-javascript linenums">import { Controller } from './Controller.js'
import { CoordinateSystem } from './CoordinateSystem.js';
import { addSignals } from './Signals.js'
/**
* ControllerPanZoom handles pan, zoom, and interaction events in a canvas element to manipulate camera parameters.
* It supports multiple interaction methods including:
* - Mouse drag for panning
* - Mouse wheel for zooming
* - Touch gestures (pinch to zoom)
* - Double tap to zoom
*
* The controller maintains state for ongoing pan and zoom operations and can be configured
* to use different coordinate systems (HTML or GL) for calculations.
*
* @extends Controller
* @fires ControllerPanZoom#nowheel - Emitted when a wheel event is received but ctrl key is required and not pressed
*/
class ControllerPanZoom extends Controller {
/**
* Creates a new ControllerPanZoom instance.
* @param {Camera} camera - The camera object to control
* @param {Object} [options] - Configuration options
* @param {number} [options.zoomAmount=1.2] - The zoom multiplier for wheel/double-tap events
* @param {boolean} [options.controlZoom=false] - If true, requires Ctrl key to be pressed for zoom operations
* @param {boolean} [options.useGLcoords=false] - If true, uses WebGL coordinate system instead of HTML
* @param {number} [options.panDelay] - Delay for pan animations
* @param {number} [options.zoomDelay] - Delay for zoom animations
*/
constructor(camera, options) {
super(options);
this.camera = camera;
this.zoomAmount = 1.2; //for wheel or double tap event
this.controlZoom = false; //require control+wheel to zoom
this.panning = false; //true if in the middle of a pan
this.initialTransform = null;
this.startMouse = null;
this.zooming = false; //true if in the middle of a pinch
this.initialDistance = 0.0;
this.useGLcoords = false;
if (options)
Object.assign(this, options);
}
/**
* Handles the start of a pan operation
* @private
* @param {PointerEvent} e - The pointer event that initiated the pan
*/
panStart(e) {
if (!this.active || this.panning || !this.activeModifiers.includes(this.modifierState(e)))
return;
this.panning = true;
this.startMouse = CoordinateSystem.fromCanvasHtmlToViewport({ x: e.offsetX, y: e.offsetY }, this.camera, this.useGLcoords);
let now = performance.now();
this.initialTransform = this.camera.getCurrentTransform(now);
this.camera.target = this.initialTransform.copy(); //stop animation.
e.preventDefault();
}
/**
* Updates camera position during a pan operation
* @private
* @param {PointerEvent} e - The pointer event with new coordinates
*/
panMove(e) {
if (!this.panning)
return;
let m = this.initialTransform;
const p = CoordinateSystem.fromCanvasHtmlToViewport({ x: e.offsetX, y: e.offsetY }, this.camera, this.useGLcoords);
let dx = (p.x - this.startMouse.x);
let dy = (p.y - this.startMouse.y);
this.camera.setPosition(this.panDelay, m.x + dx, m.y + dy, m.z, m.a);
}
/**
* Ends the current pan operation
* @private
* @param {PointerEvent} e - The pointer event that ended the pan
*/
panEnd(e) {
this.panning = false;
}
/**
* Calculates the Euclidean distance between two points
* @private
* @param {Object} e1 - First point with x, y coordinates
* @param {Object} e2 - Second point with x, y coordinates
* @returns {number} The distance between the points
*/
distance(e1, e2) {
return Math.sqrt(Math.pow(e1.x - e2.x, 2) + Math.pow(e1.y - e2.y, 2));
}
/**
* Initializes a pinch zoom operation
* @private
* @param {TouchEvent} e1 - First touch point
* @param {TouchEvent} e2 - Second touch point
*/
pinchStart(e1, e2) {
this.zooming = true;
this.initialDistance = Math.max(30, this.distance(e1, e2));
e1.preventDefault();
//e2.preventDefault(); //TODO this is optional?
}
/**
* Updates zoom level during a pinch operation
* @private
* @param {TouchEvent} e1 - First touch point
* @param {TouchEvent} e2 - Second touch point
*/
pinchMove(e1, e2) {
if (!this.zooming)
return;
let rect1 = e1.target.getBoundingClientRect();
let offsetX1 = e1.clientX - rect1.left;
let offsetY1 = e1.clientY - rect1.top;
let rect2 = e2.target.getBoundingClientRect();
let offsetX2 = e2.clientX - rect2.left;
let offsetY2 = e2.clientY - rect2.top;
const scale = this.distance(e1, e2);
// FIXME CHECK ON TOUCH SCREEN
//const pos = this.camera.mapToScene((offsetX1 + offsetX2)/2, (offsetY1 + offsetY2)/2, this.camera.getCurrentTransform(performance.now()));
const pos = CoordinateSystem.fromCanvasHtmlToScene({ x: (offsetX1 + offsetX2) / 2, y: (offsetY1 + offsetY2) / 2 }, this.camera, this.useGLcoords);
const dz = scale / this.initialDistance;
this.camera.deltaZoom(this.zoomDelay, dz, pos.x, pos.y);
this.initialDistance = scale;
e1.preventDefault();
}
/**
* Ends the current pinch zoom operation
* @private
* @param {TouchEvent} e - The touch event that ended the pinch
* @param {number} x - The x coordinate of the pinch center
* @param {number} y - The y coordinate of the pinch center
* @param {number} scale - The final scale factor
*/
pinchEnd(e, x, y, scale) {
this.zooming = false;
e.preventDefault();
}
/**
* Handles mouse wheel events for zooming
* @private
* @param {WheelEvent} e - The wheel event
* @fires ControllerPanZoom#nowheel
*/
mouseWheel(e) {
if (this.controlZoom && !e.ctrlKey) {
this.emit('nowheel');
return;
}
let delta = -e.deltaY / 53;
//const pos = this.camera.mapToScene(e.offsetX, e.offsetY, this.camera.getCurrentTransform(performance.now()));
const pos = CoordinateSystem.fromCanvasHtmlToScene({ x: e.offsetX, y: e.offsetY }, this.camera, this.useGLcoords);
const dz = Math.pow(this.zoomAmount, delta);
this.camera.deltaZoom(this.zoomDelay, dz, pos.x, pos.y);
e.preventDefault();
}
/**
* Handles double tap events for zooming
* @private
* @param {PointerEvent} e - The pointer event representing the double tap
*/
fingerDoubleTap(e) { }
fingerDoubleTap(e) {
if (!this.active || !this.activeModifiers.includes(this.modifierState(e)))
return;
//const pos = this.camera.mapToScene(e.offsetX, e.offsetY, this.camera.getCurrentTransform(performance.now()));
const pos = CoordinateSystem.fromCanvasHtmlToScene({ x: e.offsetX, y: e.offsetY }, this.camera, this.useGLcoords);
const dz = this.zoomAmount;
this.camera.deltaZoom(this.zoomDelay, dz, pos.x, pos.y);
}
}
addSignals(ControllerPanZoom, 'nowheel');
export { ControllerPanZoom }
</pre>
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