package minidrawpad;

import java.awt.BasicStroke;

import

java.awt.Color;

import java.awt.Font;

import java.awt.Graphics2D;

import java.io.Serializable;

//圖形繪制類 用于繪制各種圖形

//父類，基本圖形單元，用到串行的接口，保存使用到

//公共的屬性放到超類中，子類可以避免重復定義

/*類通過實現

java.io.Serializable 接口以啟用其序列化功能。

未實現此接口的類將無法使其任何狀態序列化或反序列化。

可序列化類的所有子類型本身都是可序列化的。序列化接口沒有方法或字段，

僅用于標識可序列化的語義。*/

public class

Drawing implements Serializable {

int x1,x2,y1,y2; //定義坐標屬性

int R,G,B; //定義色彩屬性

float stroke ; //定義線條粗細的屬性

int type; //定義字體屬性

String s1; //定義字體的風格

String s2; //定義字體的風格

void draw(Graphics2D g2d ){}//定義繪圖函數

}

class Line extends Drawing//直線類

{

void draw(Graphics2D

g2d) {

g2d.setPaint(new Color(R, G, B));// 為 Graphics2D 上下文設置 Paint

屬性。

// 使用為 null 的 Paint 對象調用此方法對此 Graphics2D 的當前 Paint 屬性沒有任何影響。

g2d.setStroke(new BasicStroke(stroke, BasicStroke.CAP_ROUND,

BasicStroke.JOIN_BEVEL));

// setStroke(Stroke s)為 Graphics2D

上下文設置 Stroke

// BasicStroke 類定義針對圖形圖元輪廓呈現屬性的一個基本集合

//

BasicStroke.CAP_ROUND使用半徑等于畫筆寬度一半的圓形裝飾結束未封閉的子路徑和虛線線段

//

BasicStroke.JOIN_BEVEL通過直線連接寬體輪廓的外角，將路徑線段連接在一起。

g2d.drawLine(x1, y1, x2,

y2);// 畫直線

}

}

class Rect extends Drawing{//矩形類

void

draw(Graphics2D g2d ){

g2d.setPaint(new Color(R,G,B));

g2d.setStroke(new BasicStroke(stroke));

g2d.drawRect(Math.min(x1,

x2), Math.min(y1, y2), Math.abs(x1-x2), Math.abs(y1-y2));

}

}

class fillRect extends Drawing{//實心矩形類

void draw(Graphics2D g2d ){

g2d.setPaint(new Color(R,G,B));

g2d.setStroke(new

BasicStroke(stroke));

g2d.fillRect(Math.min(x1, x2), Math.min(y1,

y2), Math.abs(x1-x2), Math.abs(y1-y2));

}

}

class Oval

extends Drawing{//橢圓類

void draw(Graphics2D g2d ){

g2d.setPaint(new Color(R,G,B));

g2d.setStroke(new

BasicStroke(stroke));

g2d.drawOval(Math.min(x1, x2), Math.min(y1,

y2), Math.abs(x1-x2), Math.abs(y1-y2));

}

}

class fillOval

extends Drawing{//實心橢圓類

void draw(Graphics2D g2d ){

g2d.setPaint(new Color(R,G,B));

g2d.setStroke(new

BasicStroke(stroke));

g2d.fillOval(Math.min(x1, x2), Math.min(y1,

y2), Math.abs(x1-x2), Math.abs(y1-y2));

}

}

class Circle

extends Drawing{//圓類

void draw(Graphics2D g2d ){

g2d.setPaint(new Color(R,G,B));

g2d.setStroke(new

BasicStroke(stroke));

g2d.drawOval(Math.min(x1, x2), Math.min(y1,

y2), Math.max(Math.abs(x1-x2),

Math.abs(y1-y2)),

Math.max(Math.abs(x1-x2), Math.abs(y1-y2)));

}

}

class

fillCircle extends Drawing{//實心圓類

void draw(Graphics2D g2d ){

g2d.setPaint(new Color(R,G,B));

g2d.setStroke(new

BasicStroke(stroke));

g2d.fillOval(Math.min(x1, x2), Math.min(y1,

y2), Math.max(Math.abs(x1-x2),

Math.abs(y1-y2)),

Math.max(Math.abs(x1-x2), Math.abs(y1-y2)));

}

}

class

RoundRect extends Drawing{//圓角矩形類

void draw(Graphics2D g2d ){

g2d.setPaint(new Color(R,G,B));

g2d.setStroke(new

BasicStroke(stroke));

g2d.drawRoundRect(Math.min(x1, x2),

Math.min(y1, y2),Math.abs(x1-x2), Math.abs(y1-y2),50,35);

}

}

class fillRoundRect extends Drawing{//實心圓角矩形類

void draw(Graphics2D g2d

){

g2d.setPaint(new Color(R,G,B));

g2d.setStroke(new

BasicStroke(stroke));

g2d.fillRoundRect(Math.min(x1, x2),

Math.min(y1, y2),Math.abs(x1-x2), Math.abs(y1-y2),50,35);

}

}

class Pencil extends Drawing{//隨筆畫類

void draw(Graphics2D g2d ){

g2d.setPaint(new Color(R,G,B));

g2d.setStroke(new

BasicStroke(stroke,BasicStroke.CAP_ROUND,BasicStroke.JOIN_BEVEL));

g2d.drawLine(x1, y1,x2, y2);

}

}

class Rubber extends

Drawing{//橡皮擦類

void draw(Graphics2D g2d ){

g2d.setPaint(new

Color(255,255,255));//白色

g2d.setStroke(new

BasicStroke(stroke+4,BasicStroke.CAP_ROUND,BasicStroke.JOIN_BEVEL));

g2d.drawLine(x1, y1,x2, y2);

}

}

class Word extends

Drawing{//輸入文字類

void draw(Graphics2D g2d ){

g2d.setPaint(new

Color(R,G,B));

g2d.setFont(new

Font(s2,x2+y2,((int)stroke)*18));//設置字體

if(s1 != null)

g2d.drawString( s1, x1,y1);

}

}

原文：http://www.cnblogs.com/NetPig/p/3641992.html

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