@nativescript-community/ui-chart/listener/ChartTouchListener.js

A powerful chart / graph plugin, supporting line, bar, pie, radar, bubble, and candlestick charts as well as scaling, panning and animations.

export var ChartGesture;
(function (ChartGesture) {
    ChartGesture[ChartGesture["NONE"] = 0] = "NONE";
    ChartGesture[ChartGesture["DRAG"] = 1] = "DRAG";
    ChartGesture[ChartGesture["X_ZOOM"] = 2] = "X_ZOOM";
    ChartGesture[ChartGesture["Y_ZOOM"] = 3] = "Y_ZOOM";
    ChartGesture[ChartGesture["PINCH_ZOOM"] = 4] = "PINCH_ZOOM";
    ChartGesture[ChartGesture["ROTATE"] = 5] = "ROTATE";
    ChartGesture[ChartGesture["SINGLE_TAP"] = 6] = "SINGLE_TAP";
    ChartGesture[ChartGesture["DOUBLE_TAP"] = 7] = "DOUBLE_TAP";
    ChartGesture[ChartGesture["LONG_PRESS"] = 8] = "LONG_PRESS";
    ChartGesture[ChartGesture["FLING"] = 9] = "FLING";
})(ChartGesture || (ChartGesture = {}));
/**
 * Created by philipp on 12/06/15.
 */
export class ChartTouchListener {
    constructor(chart) {
        /**
         * the last touch gesture that has been performed
         **/
        this.mLastGesture = ChartGesture.NONE;
        /**
         * integer field that holds the current touch-state
         */
        this.mTouchMode = ChartTouchListener.NONE;
        this.chart = chart;
    }
    dispose() { }
    init() { }
    /**
     * returns the touch mode the listener is currently in
     */
    get touchMode() {
        return this.mTouchMode;
    }
    /**
     * Returns the last gesture that has been performed on the chart.
     */
    get lastGesture() {
        return this.mLastGesture;
    }
    /**
     * Perform a highlight operation.
     *
     * @param e
     */
    performHighlight(h) {
        if (!h || h === this.lastHighlighted) {
            this.chart.highlight(null, true);
            this.lastHighlighted = null;
        }
        else {
            this.chart.highlight(h, true);
            this.lastHighlighted = h;
        }
    }
    /**
     * returns the distance between two points
     *
     * @param eventX
     * @param startX
     * @param eventY
     * @param startY
     * @return
     */
    static distance(eventX, startX, eventY, startY) {
        const dx = eventX - startX;
        const dy = eventY - startY;
        return Math.sqrt(dx * dx + dy * dy);
    }
}
// states
ChartTouchListener.NONE = 0;
ChartTouchListener.DRAG = 1;
ChartTouchListener.X_ZOOM = 2;
ChartTouchListener.Y_ZOOM = 3;
ChartTouchListener.PINCH_ZOOM = 4;
ChartTouchListener.POST_ZOOM = 5;
ChartTouchListener.ROTATE = 6;
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