core-graphics/lib/utils/grid.js

A core library for creating shape-based graphic editors

'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});
exports.snapCoordToGrid = snapCoordToGrid;
exports.snapCoordsIfNeeded = snapCoordsIfNeeded;
exports.snapEditorInputEventCoordsIfNeeded = snapEditorInputEventCoordsIfNeeded;

var _icepick = require('icepick');

var i = _interopRequireWildcard(_icepick);

var _editorEvents = require('../editor-state/editor-events');

function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }

function snapCoordToGrid(size, x) {
    return Math.round(x / size) * size;
}
function snapCoordsIfNeeded(gridState, coords) {
    var on = gridState.on;
    var size = gridState.size;

    if (!on) {
        return coords;
    }
    var x = coords.x;
    var y = coords.y;

    return i.merge(coords, {
        x: snapCoordToGrid(size, x),
        y: snapCoordToGrid(size, y)
    });
}
function snapEditorInputEventCoordsIfNeeded(gridState, ev) {
    if ((0, _editorEvents.isMouseDownEvent)(ev) || (0, _editorEvents.isMouseUpEvent)(ev) || (0, _editorEvents.isMouseMoveEvent)(ev) || (0, _editorEvents.isMouseEnterEvent)(ev) || (0, _editorEvents.isMouseLeaveEvent)(ev)) {
        var snappedPayload = snapCoordsIfNeeded(gridState, ev.payload);
        return i.assoc(ev, 'payload', snappedPayload);
    }
    return ev;
}