0927 java Awt.Graphics2D畫圖

 終於用java畫出數據圖了!!
我先定義一個物件讓幫我讀檔 把數據存到矩陣中，
在用awt套件的Graphics2D畫圖，
畫數據圖的時候是以每一個點去畫一個1x1的矩形，
因為他沒有point的圖形可以用 所以用矩形代替，
畫的時候要呼叫物件讀取數據，
然後會用到try{__}catch (IOException e) {__}，
我目前還不太懂這東西。。。因為eclipse幫忙除錯就用了它 哈哈哈

用java畫數據圖好麻煩。。。。。。。。
附上程式碼
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package factorial;

import java.awt.*;

import java.awt.event.*;

import java.io.BufferedReader;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.IOException;

import java.util.ArrayList;

import java.awt.geom.*;

public class Awt01 extends Frame {

static Awt01 frm = new Awt01();

static Graphics2D g2;

public static void main(String[] args) throws IOException {

Awt01 aa = new Awt01();

aa.bbb();

}

public double[] bbb() throws IOException {

frm.setTitle("Awt01");

frm.setSize(500, 600);

frm.setVisible(true);

FileReader fr = new FileReader("test.txt");

BufferedReader br = new BufferedReader(fr);

String line, tempstring;

String[] tempArray = new String[2];

ArrayList<String> myList = new ArrayList<String>();

int i = 0;

while ((line = br.readLine()) != null) {

// br.readLine()是讀取txt檔的每一行資料,把讀到的資料存到line

// 再將line丟給tempstring去儲存

tempstring = line;

// tempstring.split("\\s") 會依照空白鍵來切割,有幾個空白就切幾次

tempArray = tempstring.split("\\s");

// 按照順序.一行一行的儲存到動態陣列裡面

for (i = 0; i < tempArray.length; i++) {

myList.add(tempArray[i]);

}

}

// tempArray[]是String,一維矩陣

/*

* 轉換成double的二維矩陣 int k = myList.size() / 2; int count = 0; double[][]

* trans_array = new double[k][2]; for (int x = 0; x < myList.size() /

* 2; x++) { for (int y = 0; y < 2; y++) { trans_array[x][y] =

* Double.parseDouble((String) myList.get(count)); count++; //

* 一個index來決定myList讀取值的位置 } }

**/

// 轉換成double的一維矩陣

int k = myList.size();

int count = 0;

double[] trans_array = new double[k];

for (int x = 0; x < myList.size(); x++) {

trans_array[x] = Double.parseDouble((String) myList.get(count));

count++;

}

System.out.println(trans_array[3]);

return trans_array;

}

public void paint(Graphics g) {

Awt01 aa = new Awt01();

Graphics2D g2 = (Graphics2D) g;

Line2D linex = new Line2D.Double(0, frm.getHeight() * 5 / 6, frm.getWidth(), frm.getHeight() * 5 / 6);

Line2D liney = new Line2D.Double(frm.getWidth() / 6, 0, frm.getWidth() / 6, frm.getHeight());

g2.draw(linex);

g2.draw(liney);

try {

double[] wtf = aa.bbb();

int x1, y1;

double[] wtf2 = new double[3200];

System.out.println(wtf[50]+frm.getWidth() / 6);

for (int t = 0; t <= 1599; t++) {

y1 = t * 2;

x1 = t * 2 + 1;

wtf2[x1] = wtf[x1]* 24+frm.getWidth() / 6;

wtf2[y1] = wtf[y1]* -180+frm.getHeight() * 5 / 6;

Rectangle2D.Double r1 = new Rectangle2D.Double(wtf2[x1], wtf2[y1], 1, 1);

g2.draw(r1);

}

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}