Java后台生成图片并保存
Java后台生成图片并保存
- 1、画板工具
- 2、画笔工具类
- 3、模拟数据
- 4、测试类
- 5、最终效果图（简易）
以波形信号为例
步骤:
①获取画板
②获取画笔
③获取坐标点
1、画板工具
import java.awt.*;
/**
* 画板工具
*/
public class MyPanel {
public static final int XPOINT = 100;
public static final int YPOINT = 100;
private double[] dataSource ; //存放数据的数组
public MyPanel(double[] dataSource,Graphics g) {
this.dataSource = dataSource;
paintComponent(g);
}
/**
* 生成对应图片
* @param g
*/
public void paintComponent(Graphics g) {
g.setColor(Color.black);
g.fillRect(0, 0, ImageIOHandler.WIDTH, ImageIOHandler.HEIGHT);//设置图片尺寸
g.setColor(Color.CYAN);
g.drawLine(XPOINT, ImageIOHandler.HEIGHT - YPOINT, XPOINT, YPOINT);//画Y轴
g.drawLine(XPOINT,ImageIOHandler.HEIGHT/2, ImageIOHandler.WIDTH - XPOINT, ImageIOHandler.HEIGHT/2);//画X轴
//储存曲线上所有点的x坐标
int[] xx = new int[dataSource.length];
//储存曲线上所有点的y坐标
int[] yy = new int[dataSource.length];
//对坐标数据进行赋值
for (int i = 0; i < dataSource.length; i++) {
xx[i] = i+XPOINT;//x轴坐标
yy[i] = round(dataSource[i]);//y轴坐标,电压值
}
Graphics2D g2d = (Graphics2D) g;
g2d.setColor(Color.red);//设置曲线颜色
g2d.drawPolyline(xx, yy, dataSource.length);//画曲线
g.dispose();//绘制图形
}
//将double类型转换为int类型,并对生成曲线的位置进行校正
public int round(double data) {
//先转化电压值,之后再对图像位置进行调整
return ((int)(-data*500) + ImageIOHandler.HEIGHT/2);
}
}
2、画笔工具类
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
/**
* 将心电数据在后台输出为png格式
*/
public class ImageIOHandler {
public static final int WIDTH = 5200; //生成图片的宽度,单位是像素值
public static final int HEIGHT = 1000; //生成图片的高度,单位是像素值
/**
* 创建一个BufferedImage图片缓冲区对象并指定它宽高和类型 这样相当于创建一个画板，然后可以在上面画画
*/
BufferedImage bi = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_BGR);
/**
* 要生成图片的类型,可以是JPG GIF JPEG PNG等...
*/
final String picType = "png";
/**
* 成生成图片的保存路径和图片名称
*/
final File file = new File("." + picType);
/**
* 通过指定参数写一个图片,并保存
*
* @param bi 图片缓冲流名称
* @param picType 保存图片格式
* @param file 保存图片的文件
* @return boolean 如果失败返回一个布尔值
*/
public static boolean writeImage(BufferedImage bi, String picType, File file) {
//拿到画笔
Graphics g = bi.getGraphics();
//获取数据
ECGData data = new ECGData();
//实例化MyPanel对象,进行图片生成
MyPanel myPanel = new MyPanel(data.getData(),g);
boolean val = false;
//输出为图片
try {
val = ImageIO.write(bi, picType, file);
} catch (IOException e) {
e.printStackTrace();
}
return val;
}
}
3、模拟数据
/**
* 模拟心电数据,单位mv
*/
public class ECGData {
/**
* 心电数据数组
*/
private double[] data = {0.0130192,0.0618412,0.144839,0.247365,0.360469,0.474387,0.581796,0.676185,0.7543,0.814514,0.85764,0.878796,0.878796,0.858454,0.822651,0.773829,0.715242,0.649333,0.579354,0.509376,0.440212,0.375116,0.315716,0.261198,0.214003,0.172504,0.135888,0.104154,0.0756741,0.0512631,0.0309206,0.0170877,0.0089507,0.0040685,0,-0.0056959,-0.0138329,-0.0227836,-0.0333617,-0.0439398,-0.0553316,-0.0675371,-0.0789289,-0.0886933,-0.0968303, -0.102526,-0.106595,-0.109849,-0.109849,
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public double[] getData() {
return data;
}
}
4、测试类
/**
* 模拟心电图的生成
*/
public class Test {
public static void main(String[] args) {
ImageIOHandler image = new ImageIOHandler();
image.writeImage(image.bi, image.picType, image.file);
}
}
5、最终效果图（简易）
