finekit/src/main/java/com/fanruan/api/script/FineCanvas.java

package com.fanruan.api.script;

import com.fr.general.IOUtils;
import com.fr.graph.g2d.canvas.CanvasPainter;
import com.fr.log.FineLoggerFactory;
import com.fr.stable.StringUtils;

import java.io.InputStream;
import java.awt.image.BufferedImage;

/**
 * @author Bjorn
 * @version 10.0
 * Created by Bjorn on 2019-09-30
 */
public class FineCanvas {

    CanvasPainter.Builder canvasBuilder;

    /**
     * 构造函数，创建js引擎并加载绘制使用的通用适配js文件
     */
    public FineCanvas() throws Exception {
        canvasBuilder = CanvasPainter.newDefaultBuilder();
    }

    /**
     * 构造函数，创建js引擎并加载绘制使用的通用适配js文件，并加载指定的js文件
     *
     * @param filePath 指定的js文件路径的集合，使用相对路径即可。
     */
    public FineCanvas(String... filePath) throws Exception {
        canvasBuilder = CanvasPainter.newDefaultBuilder();
        loadAndExecute(filePath);
    }

    /**
     * 将js语句加载到缓存区。
     *
     * @param text js语句集合
     */
    public void loadText(String... text) {
        canvasBuilder.loadText(text);
    }

    /**
     * 立即执行js语句
     *
     * @param text js语句集合
     */
    public void loadTextAndExecute(String... text) throws Exception {
        canvasBuilder.loadTextAndExecute(text);
    }

    /**
     * 加载js文件
     *
     * @param filePath 指定的js文件路径的集合，使用相对路径即可。
     */
    public void loadAndExecute(String... filePath) throws Exception {
        for (String path : filePath) {
            String content = readFileBody(path);
            canvasBuilder.build().execute(content);
        }
    }

    /**
     * 执行缓存区的js语句，并返回canvas中的BufferedImage对象
     *
     * @return 绘制完成的图片对象
     */
    public BufferedImage paint() throws Exception {
        CanvasPainter painter = canvasBuilder.build();
        try {
            return painter.paint();
        } catch (Exception ex) {
            throw ex;
        } finally {
            painter.close();
        }
    }

    /**
     * 执行指定的js方法，并返回canvas中的BufferedImage对象
     *
     * @return 绘制完成的图片对象
     */
    public BufferedImage paint(String functionName, Object... parameters) throws Exception {
        CanvasPainter painter = canvasBuilder.build();
        try {
            return painter.paint(functionName, parameters);
        } catch (Exception ex) {
            throw ex;
        } finally {
            painter.close();
        }
    }

    private String readFileBody(String filePath) {
        InputStream in = FineCanvas.class.getResourceAsStream(filePath);
        String script = StringUtils.EMPTY;
        try {
            script = IOUtils.inputStream2String(in);
        } catch (Exception e) {
            FineLoggerFactory.getLogger().error(e.getMessage(), e);
        }
        return script;
    }

}