Java Graphics怎么实现界面显示文字并换行(graphics,java,开发技术)

实现效果

问题是没有很好的换行

在调用时显示想处理的字符

实现代码

Main.java

publicclassMain{
publicstaticvoidmain(String[]strings)
{
Stringpoem="破阵子·为陈同甫赋壮词以寄之\r\n"
+"作者：辛弃疾\r\n"
+"\r\n"
+"醉里挑灯看剑，梦回吹角连营。八百里分麾下炙，五十弦翻塞外声，沙场秋点兵。\r\n"
+"马作的卢飞快，弓如霹雳弦惊。了却君王天下事，赢得生前身后名。可怜白发生！";
AlgoFrameframe=newAlgoFrame("Java",poem,600,600);
System.out.print("行路难，行路难，多歧路，今安在？\n"
+"醉里挑灯看剑，梦回吹角连营");
}
}

AlgoFrame.java

importjava.awt.BasicStroke;
importjava.awt.Color;
importjava.awt.Dimension;
importjava.awt.Font;
importjava.awt.Graphics;
importjava.awt.Graphics2D;
importjava.awt.geom.Ellipse2D;
importjava.awt.geom.Rectangle2D;
importjavax.swing.*;
publicclassAlgoFrameextendsJFrame{
privateintcanvasWidth;
privateintcanvasHeight;
publicAlgoFrame(Stringtitle,Stringpoem,intcanvasWidth,intcanvasHeight){
super(title);
this.canvasHeight=canvasHeight;
this.canvasWidth=canvasWidth;
//AlgoCanvascanvas=newAlgoCanvas();
AlgoCanvascanvas=newAlgoCanvas(poem);
setContentPane(canvas);
pack();
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
publicAlgoFrame(Stringtitle){
this(title,"",1024,768);
}
publicintgetCanvasWidth(){returncanvasWidth;}
publicintsetCanvasHeight(){returncanvasHeight;}
privateclassAlgoCanvasextendsJPanel{
Fontpf=newFont("Helvetica",Font.BOLD,20);
Stringpoem="";
//Stringpoem="破阵子·为陈同甫赋壮词以寄之\r\n"
//+"作者：辛弃疾\r\n"
//+"\r\n"
//+"醉里挑灯看剑，梦回吹角连营。八百里分麾下炙，五十弦翻塞外声，沙场秋点兵。\r\n"
//+"马作的卢飞快，弓如霹雳弦惊。了却君王天下事，赢得生前身后名。可怜白发生！";
publicAlgoCanvas(Stringstrs){
this.poem=strs;
}
@Override
publicvoidpaintComponent(Graphicsgra){
Graphics2Dgraphics2d=(Graphics2D)gra;
intstrokeWidth=5;
graphics2d.setStroke(newBasicStroke(strokeWidth));
graphics2d.setColor(Color.RED);
Ellipse2Dcircle=newEllipse2D.Double(60,60,300,300);
graphics2d.draw(circle);
graphics2d.setColor(Color.BLACK);
Rectangle2Drect=newRectangle2D.Double(50,50,320,320);
graphics2d.draw(rect);
graphics2d.setColor(Color.blue);
Ellipse2Dcircle2=newEllipse2D.Float(80,80,260,260);
//graphics2d.draw(circle2);
graphics2d.fill(circle2);
//显示辛弃疾的词
graphics2d.setColor(Color.black);
//graphics2d.setFont(pf);
//graphics2d.drawString(poem,10,canvasHeight-100);
drawStringWithFontStyleLineFeed(graphics2d,poem,10,canvasHeight-100,pf);
}
@Override
publicDimensiongetPreferredSize(){
//System.out.println("running");
returnnewDimension(canvasWidth,canvasHeight);
}
//字符串总宽度
privateintgetStringLength(Graphicsg,Stringstr){
char[]strcha=str.toCharArray();
intstrWidth=g.getFontMetrics().charsWidth(strcha,0,str.length());
System.out.println("字符总宽度:"+strWidth);
returnstrWidth;
}
////每一行字符串宽度自定义也就是画布中一行的宽度
//introwWidth=1110;
////字符串字符的个数
//intstrnum=str.length();
////每一行字符的个数
privateintgetRowStrNum(intstrnum,introwWidth,intstrWidth)
{
introwstrnum=0;
rowstrnum=(rowWidth*strnum)/strWidth;
System.out.println("每行的字符数:"+rowstrnum);
returnrowstrnum;
}
//字符行数
privateintgetRows(intstrWidth,introwWidth){
introws=0;
if(strWidth%rowWidth>0){
rows=strWidth/rowWidth+1;
}else{
rows=strWidth/rowWidth;
}
System.out.println("行数:"+rows);
returnrows;
}
//字符高度
privateintgetStringHeight(Graphicsg){
intheight=g.getFontMetrics().getHeight();
System.out.println("字符高度:"+height);
returnheight;
}
//注意设置font才能计算宽度和高度
//开始绘制
privatevoiddrawStringWithFontStyleLineFeed(Graphicsg,StringstrContent,intloc_X,intloc_Y,Fontfont)
{
g.setFont(font);
//获取字符串字符的总宽度
intstrWidth=getStringLength(g,strContent);
//每一行字符串宽度
introwWidth=500;
System.out.println("每行字符宽度:"+rowWidth);
//获取字符高度
intstrHeight=getStringHeight(g);
//字符串总个数
System.out.println("字符串总个数:"+strContent.length());
if(strWidth>rowWidth){
introwstrnum=getRowStrNum(strContent.length(),rowWidth,strWidth);
introws=getRows(strWidth,rowWidth);
Stringtemp="";
for(inti=0;i<rows;i++){
//获取各行的String
if(i==rows-1){
//最后一行
temp=strContent.substring(irowstrnum,strContent.length());
}else{
temp=strContent.substring(irowstrnum,i*rowstrnum+rowstrnum);
}
if(i>0){
//第一行不需要增加字符高度，以后的每一行在换行的时候都需要增加字符高度
loc_Y=loc_Y+strHeight;
}
g.drawString(temp,loc_X,loc_Y);
}
}else{
//直接绘制
g.drawString(strContent,loc_X,loc_Y);
}
}
}
}