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diplomacy/web/src/gui/maps/common/move.js

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+// ==============================================================================
+// Copyright (C) 2019 - Philip Paquette, Steven Bocco
+//
+//  This program is free software: you can redistribute it and/or modify it under
+//  the terms of the GNU Affero General Public License as published by the Free
+//  Software Foundation, either version 3 of the License, or (at your option) any
+//  later version.
+//
+//  This program is distributed in the hope that it will be useful, but WITHOUT
+//  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+//  FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
+//  details.
+//
+//  You should have received a copy of the GNU Affero General Public License along
+//  with this program.  If not, see <https://www.gnu.org/licenses/>.
+// ==============================================================================
+import React from "react";
+import {ARMY, coloredStrokeWidth, getUnitCenter, plainStrokeWidth} from "./common";
+import PropTypes from "prop-types";
+
+export class Move extends React.Component {
+    render() {
+        const Coordinates = this.props.coordinates;
+        const SymbolSizes = this.props.symbolSizes;
+        const Colors = this.props.colors;
+        const src_loc = this.props.srcLoc;
+        const dest_loc = this.props.dstLoc;
+        const is_dislodged = this.props.phaseType === 'R';
+        const [src_loc_x, src_loc_y] = getUnitCenter(Coordinates, SymbolSizes, src_loc, is_dislodged);
+        let [dest_loc_x, dest_loc_y] = getUnitCenter(Coordinates, SymbolSizes, dest_loc, is_dislodged);
+        // Adjusting destination
+        const delta_x = dest_loc_x - src_loc_x;
+        const delta_y = dest_loc_y - src_loc_y;
+        const vector_length = Math.sqrt(delta_x * delta_x + delta_y * delta_y);
+        const delta_dec = parseFloat(SymbolSizes[ARMY].width) / 2 + 2 * coloredStrokeWidth(SymbolSizes);
+        dest_loc_x = '' + Math.round((parseFloat(src_loc_x) + (vector_length - delta_dec) / vector_length * delta_x) * 100.) / 100.;
+        dest_loc_y = '' + Math.round((parseFloat(src_loc_y) + (vector_length - delta_dec) / vector_length * delta_y) * 100.) / 100.;
+        return (
+            <g>
+                <line x1={src_loc_x}
+                      y1={src_loc_y}
+                      x2={dest_loc_x}
+                      y2={dest_loc_y}
+                      className={'varwidthshadow'}
+                      strokeWidth={'' + plainStrokeWidth(SymbolSizes)}/>
+                <line x1={src_loc_x}
+                      y1={src_loc_y}
+                      x2={dest_loc_x}
+                      y2={dest_loc_y}
+                      className={'varwidthorder'}
+                      markerEnd={'url(#arrow)'}
+                      stroke={Colors[this.props.powerName]}
+                      strokeWidth={'' + coloredStrokeWidth(SymbolSizes)}/>
+            </g>
+        );
+    }
+}
+
+Move.propTypes = {
+    srcLoc: PropTypes.string.isRequired,
+    dstLoc: PropTypes.string.isRequired,
+    powerName: PropTypes.string.isRequired,
+    phaseType: PropTypes.string.isRequired,
+    coordinates: PropTypes.object.isRequired,
+    symbolSizes: PropTypes.object.isRequired,
+    colors: PropTypes.object.isRequired
+};