    001/* ===================================================
    002 * JFreeSVG : an SVG library for the Java(tm) platform
    003 * ===================================================
    004 *
    005 * (C)opyright 2013, 2014, by Object Refinery Limited.  All rights reserved.
    006 *
    007 * Project Info:  http://www.jfree.org/jfreesvg/index.html
    008 *
    009 * This program is free software: you can redistribute it and/or modify
    010 * it under the terms of the GNU General Public License as published by
    011 * the Free Software Foundation, either version 3 of the License, or
    012 * (at your option) any later version.
    013 *
    014 * This program is distributed in the hope that it will be useful,
    015 * but WITHOUT ANY WARRANTY; without even the implied warranty of
    016 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    017 * GNU General Public License for more details.
    018 *
    019 * You should have received a copy of the GNU General Public License
    020 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    021 *
    022 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
    023 * Other names may be trademarks of their respective owners.]
    024 *
    025 * If you do not wish to be bound by the terms of the GPL, an alternative
    026 * commercial license can be purchased.  For details, please see visit the
    027 * JFreeSVG home page:
    028 *
    029 * http://www.jfree.org/jfreesvg
    030 *
    031 */
    032
    033package org.jfree.graphics2d.canvas;
    034
    035import java.io.BufferedWriter;
    036import java.io.File;
    037import java.io.FileWriter;
    038import java.io.IOException;
    039import java.util.logging.Level;
    040import java.util.logging.Logger;
    041
    042/**
    043 * Utility methods related to the {@link CanvasGraphics2D} implementation.
    044 */
    045public class CanvasUtils {
    046
    047    private CanvasUtils() {
    048        // no need to instantiate
    049    }
    050
    051    /**
    052     * Writes HTML output containing a script (usually generated by
    053     * {@link CanvasGraphics2D}) to the specified file.  This method is used
    054     * in the demo applications.
    055     *
    056     * @param f  the file.
    057     * @param title  the title for the HTML.
    058     * @param canvasID  the canvas ID.
    059     * @param width  the canvas width.
    060     * @param height  the canvas height.
    061     * @param canvasScript  the canvas script.
    062     *
    063     * @throws IOException if there is an IO error.
    064     */
    065    public static void writeToHTML(File f, String title, String canvasID,
    066            int width, int height, String canvasScript) throws IOException {
    067        BufferedWriter writer = null;
    068        try {
    069            writer = new BufferedWriter(new FileWriter(f));
    070            writer.write("<!DOCTYPE html>\n");
    071            writer.write("<html>\n");
    072            writer.write("<head>\n");
    073            writer.write("<title>" +title + "</title>\n");
    074            writer.write("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\">\n");
    075            writer.write("<script>\n");
    076            writer.write("window.onload = function() {\n");
    077            writer.write("var canvas = document.getElementById(\"" + canvasID
    078                    + "\");\n");
    079            writer.write("var ctx = canvas.getContext(\"2d\");\n");
    080            writer.write("if (!ctx.setLineDash) {\n");
    081            writer.write("ctx.setLineDash = function() {};\n");
    082            writer.write("}\n");
    083            writer.write(canvasScript + "\n");
    084            writer.write("}\n");
    085            writer.write("</script>\n");
    086            writer.write("</head>\n");
    087            writer.write("<body>\n");
    088
    089            writer.write("<canvas id=\"" + canvasID + "\" width=\"" + width
    090                    + "\" height=\"" + height + "\"></canvas>");
    091            writer.write("</body>\n");
    092            writer.write("</html>\n");
    093            writer.flush();
    094        } finally {
    095            try {
    096                if (writer != null) {
    097                    writer.close();
    098                }
    099            } catch (IOException ex) {
    100                Logger.getLogger(CanvasUtils.class.getName()).log(Level.SEVERE,
    101                        null, ex);
    102            }
    103        }
    104    }
    105
    106}