# java.awt 画矩形踩坑
本来使用Graphics2D的drawRect()方法画图的，但是出现了下边框过粗，不得已 使用了画线的方法，四个边框，单独划线，
这里要注意坐标轴和线的宽度--高度height
一下是代码
/**
* 创建私人章的方法
* @param drawStrName 输入的姓名 1- 18 位
* @param filePathAndFileName E:\test2\grp.png
* @param drawStrSpecial -- CN310110HAJ403CFD383
*/
public static void createPersonalSeal(String drawStrName,String filePathAndFileName,String drawStrSpecial) {
String drawStrSecondLine ="";
String drawStrFirstLine ="";
int length = drawStrName.length();
Map<Integer,SignImage.Params> weidthHeightMap = getWeidthHeight(length);
Params params = weidthHeightMap.get(length);
int width = params.getWidth() *2;
int height = params.getHeight() *2;
int fontHeight = 12 * 2;
int fontHeightSpecial = 12;
int frameLineWhiteSize = 8;
int newWidth = width;
int newHeight = height + frameLineWhiteSize + fontHeightSpecial;
int frameLineSize = 5;
BufferedImage buffImg = new BufferedImage(newWidth, newHeight , BufferedImage.TYPE_INT_RGB);
Graphics2D gd = buffImg.createGraphics();
//设置透明 start
buffImg = gd.getDeviceConfiguration().createCompatibleImage(newWidth, newHeight, Transparency.TRANSLUCENT);
gd = buffImg.createGraphics();
//设置透明 end
//设置字体
Font fontSong = new Font("宋体", Font.BOLD, fontHeight);
gd.setFont(fontSong);
//类对象,可以获得某个字体的高度,以及字符串的宽度
FontMetrics fmSong = gd.getFontMetrics(fontSong);
Stroke oldStroke = gd.getStroke();
//设置颜色
//设置线宽为5.0
gd.setStroke(new BasicStroke(5.0f));
//画边框
// gd.drawRect(0, 0, width - 1 , height - fontHeightSpecial -8);
// 画一个矩形
gd.fillRect(0, 0, newWidth, newHeight);
// 去除锯齿(当设置的字体过大的时候,会出现锯齿)
gd.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
gd.setColor(Color.black);
gd.fillRect(0, 0, frameLineSize, height);
gd.fillRect(0, 0, width , frameLineSize);
gd.fillRect(0, height , width, frameLineSize);
gd.fillRect(width - frameLineSize, 0, width, height);
int songFontwidthFirst = 0;
int songFontwidthSecond = 0;
int arialFontheightFirst = 0;
int arialFontheightSecond = 0;
boolean largeFlag = length >3;
if(largeFlag){
int subStartLength = length % 2;
if(subStartLength ==1){
subStartLength = (length -1)/2;
}else{
subStartLength = length / 2;
}
drawStrFirstLine = drawStrName.substring(0,subStartLength);
drawStrSecondLine = drawStrName.substring(subStartLength,length);
songFontwidthFirst = fmSong.stringWidth(drawStrFirstLine);
songFontwidthSecond = fmSong.stringWidth(drawStrSecondLine);
arialFontheightFirst = fmSong.getHeight();
arialFontheightSecond = fmSong.getHeight();
}else{
drawStrFirstLine = drawStrName;
songFontwidthFirst = fmSong.stringWidth(drawStrFirstLine);
arialFontheightFirst = fmSong.getHeight();
}
if(largeFlag){
//先画第一行,输出文字（中文横向居中）
gd.drawString(drawStrFirstLine, (width - songFontwidthFirst) /2,
(newHeight - arialFontheightFirst *2 -frameLineSize)/2 + 10);
//画第二行,输出文字（中文横向居中）
gd.drawString(drawStrSecondLine, (width - songFontwidthSecond) /2,
(newHeight - arialFontheightFirst *2 - frameLineSize )/2 + arialFontheightFirst + 20);
}else{
gd.drawString(drawStrFirstLine, (width - songFontwidthFirst) /2, newHeight /2 );
}
Font arialFont = new Font("Arial", 2, fontHeightSpecial);
gd.setFont(arialFont);
//类对象,可以获得某个字体的高度,以及字符串的宽度
FontMetrics fm = gd.getFontMetrics(arialFont);
int arialFontwidth = fm.stringWidth(drawStrSpecial);
gd.setColor(Color.BLACK);
gd.drawString(drawStrSpecial, (width - arialFontwidth) /2, newHeight);
// 透明度设置结束
gd.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));
gd.dispose();
try {
ImageIO.write(buffImg, "png", new File(filePathAndFileName));
} catch (IOException e) {
e.printStackTrace();
}
buffImg.flush();
}
public static Map<Integer,SignImage.Params> getWeidthHeight(int length){
int width =0;
int height = 0;
switch (length){
case 1:
width = 93;
height = 44 ;
break;
case 2:
width = 93;
height = 44 ;
break;
case 3:
width = 93;
height = 44 ;
break;
case 4:
width = 93;
height = 44 ;
break;
case 5:
width = 93;
height = 44 ;
break;
case 6:
width = 93;
height = 44 ;
break;
case 7:
width = 107;
height = 50;
break;
case 8:
width = 107;
height = 50;
break;
case 9:
width = 119;
height = 50;
break;
case 10:
width = 119;
height = 50;
break;
case 11:
width = 136;
height = 58;
break;
case 12:
width = 136;
height = 58;
break;
case 13:
width = 136;
height = 58;
break;
case 14:
width = 136;
height = 58;
break;
case 15:
width = 136;
height = 58;
break;
case 16:
width = 136;
height = 58;
break;
case 17:
width = 136;
height = 58;
break;
case 18:
width = 136;
height = 58;
break;
default: throw new RuntimeException("姓名字数不符合要求");
}
Map<Integer,SignImage.Params> reParentMap = com.google.common.collect.Maps.newHashMap();
SignImage.Params returnParams = new SignImage.Params();
returnParams.setHeight(height);
returnParams.setWidth(width);
reParentMap.put(length,returnParams);
return reParentMap;
}
@Data
@NoArgsConstructor
@AllArgsConstructor
@ToString
@Builder
@Accessors(chain = true)
@EqualsAndHashCode
static class Params {
int width;
int height;
}
public static void main(String[] args) {
SignImage.createPersonalSeal("张大牛","E:\\test2\\grp.png","CN310110HAJ403CFD383");
}一下为参考的资源;
private static void transparent() throws IOException {
int width = 400;
int height = 300;
// 创建BufferedImage对象
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
// 获取Graphics2D
Graphics2D g2d = image.createGraphics();
// ---------- 增加下面的代码使得背景透明 -----------------
// image = g2d.getDeviceConfiguration().createCompatibleImage(width, height, Transparency.TRANSLUCENT);
// g2d.dispose();
// g2d = image.createGraphics();
// ---------- 背景透明代码结束 -----------------
// g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,0.5f));
// 画一个矩形
g2d.fillRect(0, 0, width, height);
// 去除锯齿(当设置的字体过大的时候,会出现锯齿)
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
Color color = new Color(255, 0, 0);
g2d.setColor(color);
g2d.fillRect(0, 0, 8, height);
g2d.fillRect(0, 0, width, 8);
g2d.fillRect(0, height - 8, width, height);
g2d.fillRect(width - 8, 0, width, height);
// 画图
g2d.setColor(new Color(255, 0, 0));
g2d.setStroke(new BasicStroke(10));
g2d.drawString("name", 100, 100);
//释放对象
g2d.dispose();
BufferedImage bufferedImage = alphaProcess(image);
// 保存文件
ImageIO.write(bufferedImage, "png", new File("d:/test/test.png"));
bufferedImage.flush();
}