example/src/main/java/com/fr/function/Widget2Image.java

// 导出打印单选按钮及复选框 
package com.fr.function;

import com.fr.base.AbstractPainter;
import com.fr.base.BaseUtils;
import com.fr.base.GraphHelper;
import com.fr.base.Style;
import com.fr.general.FArray;
import com.fr.general.FRFont;
import com.fr.script.AbstractFunction;
import com.fr.stable.Primitive;
import com.fr.stable.StringUtils;

import java.awt.Color;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;

public class Widget2Image extends AbstractFunction {
    public Object run(Object[] args) {
        if (args.length < 3)
            return Primitive.NULL;
        // 第一个参数：控件类型，不区分大小写  
        String type = args[0].toString().toLowerCase();
        if (!("checkbox".equals(type) || "radiobutton".equals(type)))
            return Primitive.ERROR_VALUE;
        // 第二个参数：控件按钮个数  
        int num = Integer.parseInt(args[1].toString());
        // 第三个参数：按钮组的值，哪些被选中  
        String selection = args[2].toString();
        // 第四个参数:可选参数，按钮组对应的显示值数组  
        FArray textArray = new FArray();
        if (args.length == 4 && args[3] instanceof FArray) {
            textArray = (FArray) args[3];
        }
        return new WidgetPaint(type, num, selection, textArray);
    }

    public static class WidgetPaint extends AbstractPainter {
        public static String CHECK_ON = "/com/fr/web/images/checkon.gif";
        public static String CHECK_OFF = "/com/fr/web/images/checkoff.gif";
        public static String RADIO_ON = "/com/fr/web/images/radioon.gif";
        public static String RADIO_OFF = "/com/fr/web/images/radiooff.gif";
        public static FRFont DEFUALT_FONT = FRFont.getInstance();
        public static FontMetrics FontMetrics = GraphHelper
                .getFontMetrics(DEFUALT_FONT);
        private String type;
        private int num;
        private String selection;
        private FArray textArray;

        {
            DEFUALT_FONT = DEFUALT_FONT.applyForeground(Color.BLACK);
        }

        public WidgetPaint(String type, int num, String selection,
                           FArray textArray) {
            this.type = type;
            this.num = num;
            this.selection = selection;
            this.textArray = textArray;
        }

        private String resolveText(int i) {
            if (i < this.textArray.length()) {
                return this.textArray.elementAt(i).toString();
            }
            return StringUtils.EMPTY;
        }

        public void paint(Graphics g, int width, int height, int resolution,
                          Style style) {
            String OFF = CHECK_OFF;
            String ON = CHECK_ON;
            if ("radiobutton".equals(type)) {
                OFF = RADIO_OFF;
                ON = RADIO_ON;
            }
            Image[] checkOFFON = {BaseUtils.readImage(OFF),
                    BaseUtils.readImage(ON)};
            int[] imgWidths = {checkOFFON[0].getWidth(null),
                    checkOFFON[1].getWidth(null)};
            int[] imgHeights = {checkOFFON[0].getHeight(null),
                    checkOFFON[1].getHeight(null)};
            Graphics2D g2d = (Graphics2D) g;
            g2d.setFont(FRFont.getInstance());
            g2d.setPaint(Color.BLACK);
            int x = 2;
            int y = (height - imgHeights[0]) / 2;
            String select = selection;
            for (int i = 0; i < num; i++) {
                int bit = Integer.parseInt(select.substring(i, i + 1));
                g2d.drawImage(checkOFFON[bit], x, y, imgWidths[bit],
                        imgHeights[bit], null);
                x += imgWidths[bit] + 2;
                String text = resolveText(i);
                g2d.setBackground(Color.BLACK);
                g2d.drawString(text, (float) x, (float) (y + FontMetrics
                        .getAscent()));
                x += FontMetrics.stringWidth(text) + 2;
            }
        }
    }
}