import {Point2D} from '../math/point';
import {Line} from '../math/line';
import {getLayerDetailsFromEvent} from '../gui/layerGroup';
// doc imports
/* eslint-disable no-unused-vars */
import {App} from '../app/application';
/* eslint-enable no-unused-vars */
/**
* ZoomAndPan class.
*
* @example
* // create the dwv app
* const app = new dwv.App();
* // initialise
* const viewConfig0 = new dwv.ViewConfig('layerGroup0');
* const viewConfigs = {'*': [viewConfig0]};
* const options = new dwv.AppOptions(viewConfigs);
* options.tools = {ZoomAndPan: new dwv.ToolConfig()};
* app.init(options);
* // activate tool
* app.addEventListener('load', function () {
* app.setTool('ZoomAndPan');
* });
* // load dicom data
* app.loadURLs([
* 'https://raw.githubusercontent.com/ivmartel/dwv/master/tests/data/bbmri-53323851.dcm'
* ]);
*/
export class ZoomAndPan {
/**
* Associated app.
*
* @type {App}
*/
#app;
/**
* Interaction start flag.
*
* @type {boolean}
*/
#started = false;
/**
* @param {App} app The associated application.
*/
constructor(app) {
this.#app = app;
}
/**
* Handle mouse down event.
*
* @param {object} event The mouse down event.
*/
mousedown = (event) => {
this.#started = true;
// first position
this.x0 = event._x;
this.y0 = event._y;
};
/**
* Handle two touch down event.
*
* @param {object} event The touch down event.
*/
twotouchdown = (event) => {
this.#started = true;
// store first point
this.x0 = event._x;
this.y0 = event._y;
// first line
const point0 = new Point2D(event._x, event._y);
const point1 = new Point2D(event._x1, event._y1);
this.line0 = new Line(point0, point1);
this.midPoint = this.line0.getMidpoint();
};
/**
* Handle mouse move event.
*
* @param {object} event The mouse move event.
*/
mousemove = (event) => {
if (!this.#started) {
return;
}
// calculate translation
const tx = event._x - this.x0;
const ty = event._y - this.y0;
// apply translation
const layerDetails = getLayerDetailsFromEvent(event);
const layerGroup = this.#app.getLayerGroupByDivId(layerDetails.groupDivId);
const viewLayer = layerGroup.getActiveViewLayer();
const viewController = viewLayer.getViewController();
const planeOffset = viewLayer.displayToPlaneScale(tx, ty);
const offset3D = viewController.getOffset3DFromPlaneOffset(planeOffset);
layerGroup.addTranslation({
x: offset3D.getX(),
y: offset3D.getY(),
z: offset3D.getZ()
});
layerGroup.draw();
// reset origin point
this.x0 = event._x;
this.y0 = event._y;
};
/**
* Handle two touch move event.
*
* @param {object} event The touch move event.
*/
twotouchmove = (event) => {
if (!this.#started) {
return;
}
const point0 = new Point2D(event._x, event._y);
const point1 = new Point2D(event._x1, event._y1);
const newLine = new Line(point0, point1);
const lineRatio = newLine.getLength() / this.line0.getLength();
const layerDetails = getLayerDetailsFromEvent(event);
const layerGroup = this.#app.getLayerGroupByDivId(layerDetails.groupDivId);
const viewLayer = layerGroup.getActiveViewLayer();
const viewController = viewLayer.getViewController();
if (lineRatio === 1) {
// scroll mode
// difference to last position
const diffY = event._y - this.y0;
// do not trigger for small moves
if (Math.abs(diffY) < 15) {
return;
}
// update view controller
if (viewController.canScroll()) {
if (diffY > 0) {
viewController.incrementScrollIndex();
} else {
viewController.decrementScrollIndex();
}
}
} else {
// zoom mode
const zoom = (lineRatio - 1) / 10;
if (Math.abs(zoom) % 0.1 <= 0.05) {
const planePos = viewLayer.displayToMainPlanePos(
this.midPoint.getX(), this.midPoint.getY());
const center = viewController.getPlanePositionFromPlanePoint(planePos);
layerGroup.addScale(zoom, center);
layerGroup.draw();
}
}
};
/**
* Handle mouse up event.
*
* @param {object} _event The mouse up event.
*/
mouseup = (_event) => {
if (this.#started) {
// stop recording
this.#started = false;
}
};
/**
* Handle mouse out event.
*
* @param {object} event The mouse out event.
*/
mouseout = (event) => {
this.mouseup(event);
};
/**
* Handle touch start event.
*
* @param {object} event The touch start event.
*/
touchstart = (event) => {
const touches = event.targetTouches;
if (touches.length === 1) {
this.mousedown(event);
} else if (touches.length === 2) {
this.twotouchdown(event);
}
};
/**
* Handle touch move event.
*
* @param {object} event The touch move event.
*/
touchmove = (event) => {
const touches = event.targetTouches;
if (touches.length === 1) {
this.mousemove(event);
} else if (touches.length === 2) {
this.twotouchmove(event);
}
};
/**
* Handle touch end event.
*
* @param {object} event The touch end event.
*/
touchend = (event) => {
this.mouseup(event);
};
/**
* Handle mouse wheel event.
*
* @param {object} event The mouse wheel event.
*/
wheel = (event) => {
const step = -event.deltaY / 500;
const layerDetails = getLayerDetailsFromEvent(event);
const layerGroup = this.#app.getLayerGroupByDivId(layerDetails.groupDivId);
const viewLayer = layerGroup.getActiveViewLayer();
const viewController = viewLayer.getViewController();
const planePos = viewLayer.displayToMainPlanePos(event._x, event._y);
const center = viewController.getPlanePositionFromPlanePoint(planePos);
layerGroup.addScale(step, center);
layerGroup.draw();
};
/**
* Handle key down event.
*
* @param {object} event The key down event.
*/
keydown = (event) => {
event.context = 'ZoomAndPan';
this.#app.onKeydown(event);
};
/**
* Activate the tool.
*
* @param {boolean} _bool The flag to activate or not.
*/
activate(_bool) {
// does nothing
}
/**
* Initialise the tool.
*/
init() {
// does nothing
}
} // ZoomAndPan class