edu.ycp.cs320.fokemon_webApp.client.LogoGroup.java Source code

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Here is the source code for edu.ycp.cs320.fokemon_webApp.client.LogoGroup.java

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/*******************************************************************************
 * Copyright 2011 Google Inc. All Rights Reserved.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * 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 edu.ycp.cs320.fokemon_webApp.client;

import com.google.gwt.canvas.dom.client.CanvasPixelArray;
import com.google.gwt.canvas.dom.client.Context2d;
import com.google.gwt.canvas.dom.client.ImageData;
import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.ImageElement;
import com.google.gwt.event.dom.client.LoadEvent;
import com.google.gwt.event.dom.client.LoadHandler;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.RootPanel;

public class LogoGroup {
    final double width;
    final double height;
    final int numLogos;
    final double radius;
    Image logoImg;
    Logo[] logos;
    boolean imageLoaded;

    double k;

    public LogoGroup(double width, double height, int numLogos, double radius) {
        this.width = width;
        this.height = height;
        this.numLogos = numLogos;
        this.radius = radius;

        // init logos array
        logos = new Logo[numLogos];

        // init image
        logoImg = new Image("23x25_Trainer_Front.png");
        logoImg.addLoadHandler(new LoadHandler() {
            public void onLoad(LoadEvent event) {
                imageLoaded = true;
                // once image is loaded, init logo objects
                ImageElement imageElement = (ImageElement) logoImg.getElement().cast();
                for (int i = logos.length - 1; i >= 0; i--) {
                    Logo logo = new Logo(imageElement);
                    logo.pos.x = LogoGroup.this.width / 2;
                    logo.pos.y = LogoGroup.this.height / 2;
                    logos[i] = logo;
                }
            }
        });
        logoImg.setVisible(false);
        RootPanel.get().add(logoImg); // image must be on page to fire load
    }

    public void update(double mouseX, double mouseY) {
        if (!imageLoaded) {
            return;
        }

        k = (k + Math.PI / 2.0 * 0.009);

        for (int i = numLogos - 1; i >= 0; i--) {
            Logo logo = logos[i];
            double logoPerTPi = 2 * Math.PI * i / numLogos;
            Vector goal = new Vector(width / 2 + radius * Math.cos(k + logoPerTPi),
                    height / 2 + radius * Math.sin(k + logoPerTPi));
            logo.goal.set(goal);
            logo.rot = k + logoPerTPi + Math.PI / 2.0;

            Vector d = new Vector(mouseX, mouseY);
            d.sub(logo.pos);
            if (d.magSquared() < 50 * 50) {
                logo.goal = Vector.sub(logo.pos, d);
            }

            logo.update();
        }
    }

    public void draw(Context2d context) {
        if (!imageLoaded) {
            return;
        }

        for (int i = numLogos - 1; i >= 0; i--) {
            logos[i].draw(context);
        }
    }

    public void draw(Context2d back, Context2d front) {
        front.drawImage(back.getCanvas(), 0, 0);
    }
}