swing 画平滑曲线

package zhipu.trial.graph;

import zhipu.main.Entrance;

import javax.swing.*;

import java.awt.*;
import java.awt.geom.GeneralPath;
import java.util.ArrayList;
import java.util.List;

public class DrawChartDemo extends JPanel { private Float[] values =  new Float[]{0.00476401629000442f ,
 0.0063234711479510904f,
 0.021695992320743099f,
 0.0087923714104826394f,
 0.016055573626994599f,
 0.013452284007208701f,
 0.0055611602146519801f,
 0.0069146150381687596f,
 0.0036230541986219198f,
 0.0061674043426179301f,
 0.00434440023492552f,
 0.035138205238166999f,
 0.0143897055961933f,
 0.016811934089353098f,
 0.0178861993959042f,
 0.0087641654315109407f,
 0.0102057457561573f,
 0.0073624585142180602f,
 0.272971583614874f,
 0.0548574538534378f,
 0.016955049412583498f,
 0.0051184965677307202f,
 0.0033135295393096199f,
 0.0059344633867462002f,
 0.0039347395484018001f,
 0.00348367923743807f,
 0.026377286849230099f,
 0.036832070301518f,
 0.0056683752431168398f,
 0.0047084728862943504f,
 0.0050807108798568996f,
 0.0105448869266738f,
 0.0056977138353234702f,
 0.085602792538286607f,
 0.0043054151148011997f,
 0.0061197850778468496f,
 0.0144032602561065f,
 0.0098497881084309603f,
 0.0065389022201078504f,
 0.0079793910312075996f,
 0.15023645197019f,
 0.0068558337838472202f,
 0.00388789967772707f,
 0.0019588905560046599f,
 0.00813157867268848f,
 0.0181800097326743f,
 0.0179981531868081f,
 0.120687865774082f,
 0.031901241417862901f,
 0.0059096372433688803f,
 0.039816888009691f,
 0.0022180602796087298f,
 0.0020421521163729701f,
 0.0029398192573330999f,
 0.0090383331308239393f,
 0.069211309213069394f,
 0.111332699808443f,
 0.044655161421859497f,
 0.0057869308391771297f,
 0.0041646558052810603f,
 0.0019861723474547599f,
 0.0038429991850212901f,
 0.0064167275578309001f,
 0.0583319986899676f,
 0.029744027162729499f,
 0.0120586137993033f,
 0.13488486713846501f,
 0.046035790422276901f,
 0.015785314062179999f,
 0.0039932783490598603f,
 0.0081173362329025698f,
 0.101646122607811f,
 0.27943278350252698f,
 0.0150728510109874f,
 0.013116721411450901f,
 0.0092261367320127692f,
 0.026218708859473899f,
 0.00282953555265384f,
 0.0044117373389137102f,
 0.00260404985014934f,
 0.0019293731880499201f,
 0.00190464973226343f,
 0.0038443276152136602f,
 0.034056811633866202f,
 1f,
 0.094481973471835803f,
 0.056033417554237797f,
 0.018825637176542499f,
 0.012730403947311f,
 0.0065964488004084604f,
 0.0126633133100138f,
 0.0080601022249829398f,
 0.0089431644768543598f,
 0.025988444047573799f,
 0.025109531649443f,
 0.113067555237683f,
 0.026435961558734799f,
 0.070132172326724307f,
 0.0044758225616537703f,
 0.0059336269122534204f,
 0.0036456993373522898f,
 0.0118958563883495f,
 0.0575133588137191f,
 0.015350604576100499f,
 0.0040318661392891499f,
 0.0032193573469880901f,
 0.0088850481743988092f,
 0.023877330732745498f,
 0.011155327017979f,
 0.0083402368409935708f,
 0.0573569045895874f,
 0.69517440147232901f,
 0.094371184910862896f,
 0.071074104420728201f,
 0.036956650045186501f,
 0.0173215382293214f,
 0.0082548025110114592f,
 0.00575279184699701f,
 0.0212456696437636f,
 0.0090010269608339806f,
 0.016338080136423599f,
 0.102902209055831f,
 0.0078924297946662402f,
 0.0074607529655075604f,
 0.0091213387724318404f,
 0.0021516241375805099f,
 0.043235898066084501f,
 0.0025994439364933199f,
 0.020705025675201501f,
 0.0032286088255712199f,
 0.0050739272892518896f,
 0.0077606155122827997f,
 0.24031502163576099f,
 0.0361153446322387f,
 0.010647914836661301f,
 0.0034358292189724002f,
 0.0034736207897978801f,
 0.00342349287658111f,
 0.0027815949551543298f,
 0.21694338263132201f,
 0.026700254130092999f,
 0.0247184156591739f,
 0.019277156255502199f,
 0.061541706635920297f,
 0.014204979551463199f,
 0.098758600131271204f,
 0.0109810452672438f,
 0.011093174362075801f,
 0.0035773478807027402f,
 0.024341837124427598f,
 0.095577421992731795f,
 0.068092147724430493f,
 0.025021579201069202f,
 0.126686929940758f,
 0.0274313458782336f,
 0.0021874701261044402f,
 0.0018053147965141801f,
 0.0047045163060877001f,
 0.060906978228009202f,
 0.013506145600343401f,
 0.057883280380810802f,
 0.0135282913118019f,
 0.133110570121451f,
 0.0196209073352617f,
 0.0081105463525148799f,
 0.0166649644250235f,
 0.119949170146833f,
 0.35597758971746102f,
 0.086355513768921199f,
 0.020482876765933199f,
 0.014151643764207401f,
 0.0080725779012815208f,
 0.0038027676021578499f,
 0.015995267888023499f,
 0.0024399349293019101f,
 0.0065235374981799004f,
 0.0051175119611385602f,
 0.051700471945563202f,
 0.0116097754442507f,
 0.024850592780722301f,
 0.0073334465479829398f,
 0.0282795436228921f,
 0.0071780000763853003f,
 0.0047777663463222002f,
 0.0073803493784771702f,
 0.0043306186181200097f,
 0.0064184788227479601f};

 List<GeneralPath> paths =new ArrayList<GeneralPath>();
 int maxindex=0;
 float maxvalue=-1;
 int heith=100;
 public DrawChartDemo() { int startY=0;
 int endY=0;
 for (int j = 0; j <5; j++) { Float[] points=values.clone();
 startY=j*heith;
 endY=(j+1)*heith;

 GeneralPath path = new GeneralPath();
// path.lineTo(0,100);
// path.lineTo(0, heith-points[0]);
 int index = 0;
 int indexnext = 0;
 for (int i = 0; i < points.length - 1; ++i) { points[i] *= heith;
 if (points[i] > maxvalue) { maxvalue = points[i];
 maxindex = i;
 } } path.moveTo(0, endY - points[0]);
 for (int i = 0; i < points.length - 1; ++i) { index = i * 5;
 indexnext = (i + 1) * 5;
 float sp = points[i];
 float ep = points[i + 1];
// Point c1 = new Point((i + i+1)/2, sp);
// Point c2 = new Point((i + i+1)/2, ep);
 path.curveTo((index + indexnext) / 2, endY - sp, (index + indexnext) / 2, endY - ep, (index + 5), endY - ep);
 if (maxindex == i) {

// path.lineTo((index+indexnext)/2,100);
// path.lineTo((index+indexnext)/2, heith-ep);
 } } paths.add(path);
 } } @Override
 protected void paintComponent(Graphics g) { super.paintComponent(g);
 Graphics2D g2d = (Graphics2D) g;
 g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
 g2d.setStroke(new BasicStroke(1));
 g2d.translate(40, 40);
 int gsize = paths.size();
 for (int j = 0; j < gsize; j++) { g2d.setColor(Color.blue);
 g2d.draw(paths.get(j));
 g2d.setColor(Color.red);
 g2d.drawLine(maxindex*5,heith,maxindex*5,0);
 }

// for (int i = 0; i < points.length; ++i) {
// g2d.setColor(Color.GRAY);
// g2d.fillOval(points[i].x-4, points[i].y-4, 8, 8);
// g2d.setColor(Color.BLACK);
// g2d.drawOval(points[i].x-4, points[i].y-4, 8, 8);
// }
 } private static void createAndShowGui() { JFrame frame = new JFrame("Smooth Curve");
 frame.setContentPane(new DrawChartDemo());
 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 frame.setSize(820, 280);
 frame.setLocationRelativeTo(null);
 frame.setVisible(true);
 } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { Entrance.startTime=System.currentTimeMillis();   //获取开始时间
 createAndShowGui();

 Entrance.endTime=System.currentTimeMillis();   //获取开始时间
 System.out.println("程序启动时间： " + (Entrance.endTime - Entrance.startTime) + "ms");
 } });
 }
}

文章来源: blog.csdn.net，作者：网奇，版权归原作者所有，如需转载，请联系作者。

原文链接：blog.csdn.net/jacke121/article/details/75212815