com.kotcrab.vis.editor.module.scene.action.ChangePolygonAction.java Source code

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Here is the source code for com.kotcrab.vis.editor.module.scene.action.ChangePolygonAction.java

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/*
 * Copyright 2014-2016 See AUTHORS file.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.kotcrab.vis.editor.module.scene.action;

import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.utils.Array;
import com.kotcrab.vis.editor.module.scene.entitymanipulator.EntityManipulatorModule;
import com.kotcrab.vis.editor.proxy.EntityProxy;
import com.kotcrab.vis.editor.util.undo.UndoableAction;
import com.kotcrab.vis.runtime.component.VisPolygon;

/** @author Kotcrab */
public class ChangePolygonAction implements UndoableAction {
    private EntityManipulatorModule entityManipulator;

    private final EntityProxy proxy;
    private Array<Vector2> vertices;
    private Vector2[][] faces;

    private Array<Vector2> oldVertices;
    private Vector2[][] oldFaces;

    public ChangePolygonAction(EntityManipulatorModule entityManipulator, EntityProxy proxy) {
        this.entityManipulator = entityManipulator;
        this.proxy = proxy;

        VisPolygon component = proxy.getComponent(VisPolygon.class);
        oldVertices = copyArray(component.vertices);
        oldFaces = component.faces;
    }

    public void takeSnapshot() {
        VisPolygon component = proxy.getComponent(VisPolygon.class);
        vertices = copyArray(component.vertices);
        faces = component.faces;
    }

    private Array<Vector2> copyArray(Array<Vector2> orig) {
        Array<Vector2> copy = new Array<>(orig.size);

        for (Vector2 v : orig) {
            copy.add(new Vector2(v));
        }

        return copy;
    }

    @Override
    public void undo() {
        swap(oldVertices, oldFaces);
    }

    @Override
    public void execute() {
        swap(vertices, faces);
    }

    private void swap(Array<Vector2> newPoints, Vector2[][] newVertices) {
        if (vertices == null)
            throw new IllegalStateException("You must call #takeSnapshot first!");

        proxy.reload();

        VisPolygon component = proxy.getComponent(VisPolygon.class);
        component.vertices = newPoints;
        component.faces = newVertices;

        entityManipulator.selectedEntitiesValuesChanged();
    }

    @Override
    public String getActionName() {
        return "Modify Polygon";
    }
}