baseobject.java

用java编写的画图面板程序（有源代码）

/**
 * @(#)G2d.java
 */
package project.paint;

import java.awt.*;
import java.awt.geom.*;
import java.util.*;

public class BaseObject  implements Cloneable{

	public static final int PENCIL=0;
	public static final int LINE=1;
	public static final int RECTANGLE=2;
	public static final int ROUNDRECT=3;
	public static final int OVAL=4;
	public static final int POLYGON=5;	
	public static final int FILL=6;
	public static final int ERASE=7;
	public static final int ROTATE=8;

	public int type; //对象类型
	public float stroke;//画笔粗细
	public Color color;//渐变色
	public Color color2;
	public int gradientPaint;//渐变类型
	public Point p1,p2;//渐变端点
	protected Paint ptInterface;
	protected Shape shape;
	protected Shape shape2;
	public boolean filled;
	public boolean isSquare;
	public double rotateNum;
	protected LinkedList<Integer> X,Y;
	public BaseObject() {
		X=new LinkedList<Integer>();
		Y=new LinkedList<Integer>();
		stroke=1.0f;
		color=Color.BLACK;
		color2=Color.WHITE;
		gradientPaint=0;
		filled=false;
		isSquare=false;
		rotateNum=0;
		type=99;
	}
	//判断是否在对象内
	public boolean isCursorIn(int x,int y) {
		try {
			if (shape.contains(x,y))
				return true;
			else
				return false;
		} catch (NullPointerException npe) {	
			return false;
		}
	}
	//判断对象是否可以旋转
	public boolean canRotate(int x,int y) {
		int x2=getPointX(1);
		int y2=getPointY(1);
		int x1=getPointX(0);
		int y1=getPointY(0);
		if ((x>x2-6) && (y>y2-6) && (x<x2+6) && (y<y2+6))
			return true;
		else if((x>x1-6) && (y>y1-6) && (x<x1+6) && (y<y1+6))
			return true;
		else if((x>x2-6) && (y>y1-6) && (x<x2+6) && (y<y1+6))
			return true;
		else if((x>x1-6) && (y>y2-6) && (x<x1+6) && (y<y2+6))
			return true;
		else
			return false;
	}
	//判断对象是否可以改变大小
	public boolean canResizeObject(int x,int y) {
		int buff=(int)(stroke/2);
		//int x2=getMaxX()+buff;
		//int y2=getMaxY()+buff;
		int x2=getPointX(1);
		int y2=getPointY(1);
		if ((x>x2-4) && (y>y2-4) && (x<x2+4) && (y<y2+4))
			return true;
		else
			return false;
	}
	
	public void draw(Graphics2D g) {}
	
	public void fill(){}
	
	public void drawLastLine(Graphics2D g) {}
	
	public void addPoint(int x,int y) {}
	
	public void setPoint(int i,int x,int y) {
		X.set(i,x);
		Y.set(i,y);
	}
	
	public int getPointX(int i) {
		return (int)(X.get(i));
	}
	
	public int getPointY(int i) {
		return (int)(Y.get(i));
	}
	
	public int getLength() {
		return X.size();
	}
	
	public int getWidth() {
		return Math.abs(getPointX(0)-getPointX(1));
	}
	
	public int getHeight() {
		return Math.abs(getPointY(0)-getPointY(1));
	}
	
	public int getMinX() {
		return Math.min(getPointX(0),getPointX(1));
	}
	
	public int getMinY() {
		return Math.min(getPointY(0),getPointY(1));
	}
	
	public int getMaxX() {
		return Math.max(getPointX(0),getPointX(1));
	}
	
	public int getMaxY() {
		return Math.max(getPointY(0),getPointY(1));
	}
	
	public String toString() {
		return "未知二维图形";
	}
	//设置对象的渐变色
	public void setGradientPaint(Point p1,Point p2) {
		try {
			this.p1=p1;
			this.p2=p2;
			ptInterface=new GradientPaint(p1,color,p2,color2);
		} catch (Exception e) {
			System.out.println ("==============================");
			System.out.println ("setGradientPaint(Point,Point)方法中出现异常: ");
	
		}
	}
	//改变对象的大小
	public void changeSize(int x,int y) {
		//判断二维图形
		if (isSquare) {
			int w=x-getPointX(0);
			int h=y-getPointY(0);
			int s=Math.min(Math.abs(w),Math.abs(h));
			if (w>0 && h>0)
				addPoint(getPointX(0)+s,getPointY(0)+s);
			else if (w>0 && h<0)
				addPoint(getPointX(0)+s,getPointY(0)-s);
			else if (w<0 && h>0)
				addPoint(getPointX(0)-s,getPointY(0)+s);
			else if (w<0 && h<0)
				addPoint(getPointX(0)-s,getPointY(0)-s);
				
		} else {
			addPoint(x,y);
		}
	}
	public void rotate(){
		
	}
	//移动对象
	public void moveObject(int xBuff,int yBuff) {
		for (int i=getLength()-1; i>=0; i--) {
			setPoint(i,getPointX(i)+xBuff,getPointY(i)+yBuff);
		}
		if (gradientPaint>0) {	//渐变填充处理
			try {
				p1=new Point(p1.x+xBuff,p1.y+yBuff);
				p2=new Point(p2.x+xBuff,p2.y+yBuff);
				setGradientPaint(p1,p2);
			} catch (Exception e) {		//没有两个点
				System.out.println ("==============================");
				System.out.println ("moveObject(int,int)方法出现异常:");
				
			}
		}
	}
	//画对象获取焦点的8个点
	public void drawMoveFocus(Graphics2D g,Color backColor) {
		AffineTransform af=g.getTransform();
		if(rotateNum!=0)
		{
		    g.translate(getMinX(),getMinY());
		}
		g.rotate(rotateNum);
		int x1=getMinX();
		int y1=getMinY();
		int x2=getMaxX();
		int y2=getMaxY();
		int buff=0;
		if(rotateNum!=0)
		{
			x2=x2-x1;
		    y2=y2-y1;
		    x1=0;y1=0;  
		}
		if (!filled) {
			buff=(int)(stroke/2)+1;
		}
		g.setStroke(new BasicStroke(1.0f));
		g.setXORMode(backColor);
		g.drawRect(x1-6-buff,y1-6-buff,5,5);
		g.drawRect(x1-6-buff,y2+buff,5,5);
		g.drawRect(x2+buff,y1-6-buff,5,5);
		g.drawRect(x2+buff,y2+buff,5,5);
		
		g.drawRect((x1+x2)/2-2-buff,y1-6-buff,5,5);
		g.drawRect(x1-6-buff,(y1+y2)/2-2-buff,5,5);
		g.drawRect((x1+x2)/2-2-buff,y2+buff,5,5);
		g.drawRect(x2+buff,(y1+y2)/2-2-buff,5,5);

		if (isChangablePoint(x1,y1))
			g.fillRect(x1-5-buff,y1-5-buff,5,5);
		else if (isChangablePoint(x1,y2))
			g.fillRect(x1-5-buff,y2+buff,5,5);
		else if (isChangablePoint(x2,y1))
			g.fillRect(x2+buff,y1-5-buff,5,5);
		else if (isChangablePoint(x2,y2))
			g.fillRect(x2+buff,y2+buff,5,5);
		
		// 绘制旋转点 
	/*	g.drawLine((x1+x2)/2-buff,y1-14-buff,(x1+x2)/2-buff,y1-7-buff);
		g.setColor(new Color(0x22,0xB1,0x4C));
		g.fillRect((x1+x2)/2-2-buff,y1-20-buff,6,6);*/
		
		
		g.setXORMode(backColor);
		if(rotateNum!=0)
			g.setTransform(af);
	}
    //画对象旋转焦点的4个点
	public void drawRotateFocus(Graphics2D g){
		AffineTransform af=g.getTransform();
		if(rotateNum!=0)
		{
		    g.translate(getMinX(),getMinY());
		}
		g.rotate(rotateNum);
		
		int x1=getMinX();
		int y1=getMinY();
		int x2=getMaxX();
		int y2=getMaxY();
		int buff=0;
		if (!filled) {
			buff=(int)(stroke/2)+1;
		}
		if(rotateNum!=0)
		{
			x2=x2-x1;
		    y2=y2-y1;
		    x1=0;
		    y1=0;	    
		}
		g.setColor(new Color(0x22,0xB1,0x4C));
		g.fillRect(x1-6-buff,y1-6-buff,8,8);
		g.drawRect(x1-6-buff,y2+buff,5,5);
		g.drawRect(x2+buff,y1-6-buff,5,5);
		g.drawRect(x2+buff,y2+buff,5,5);
		
		if(rotateNum!=0)
			g.setTransform(af);
	//	g.fillRect((x1+x2)/2-2-buff,y1-6-buff,5,5);
	//	g.fillRect(x1-6-buff,(y1+y2)/2-2-buff,5,5);
	//	g.fillRect((x1+x2)/2-2-buff,y2+buff,5,5);
	//	g.fillRect(x2+buff,(y1+y2)/2-2-buff,5,5);
	}
	
	protected boolean isChangablePoint(int x,int y) {
		if (x==getPointX(1) && y==getPointY(1))
			return true;
		else
			return false;
	}
	
	public void doDraw(Graphics2D g2d,Shape shape) {
		AffineTransform af=g2d.getTransform();
		Shape temp;
		temp=shape;
		if(rotateNum!=0)
		{
			g2d.translate(getMinX(),getMinY());

			shape=shape2;	    
		}
		g2d.rotate(rotateNum);
		if (filled) {
			if (gradientPaint>0) {
				g2d.setTransform(new AffineTransform());
				g2d.setPaint(ptInterface);
			} else {
				g2d.setPaint(color);
			}
			//g2d.translate(this.getWidth() / 2, this.getHeight() / 2);
			//g2d.rotate(0);
			g2d.fill(shape);
		} else {
			g2d.setPaint(color);
			g2d.setStroke(new BasicStroke(stroke));
			g2d.draw(shape);
		}
		if(rotateNum!=0)
		{
			g2d.setTransform(af);
			shape=temp;
		}
	}
	public Object clone() throws CloneNotSupportedException { 
		BaseObject bo = (BaseObject)super.clone();
		//sheep = (Sheep)fold.sheep.clone();
		X=(LinkedList<Integer>) bo.X.clone();
		Y=(LinkedList<Integer>) bo.Y.clone();
		return bo;
    }
}









//星星类
class ObjPolygon extends BaseObject {
	private int x1,y1,x2,y2;
	private int xBase,yBase;
	private int radians;
	private int[] size={0,0};
	private double increase;
	public ObjPolygon() {
		this(5);
	}
	public ObjPolygon(int rad) {
		super();
		radians=rad;
		increase=Math.toRadians(360.0/(rad*2));
		for (int i=0; i<radians*2; i++) {
			X.add(0);
			Y.add(0);
		}
		type=BaseObject.POLYGON;
	}
	public String toString() {
		return "星星 "+String.valueOf(getLength()/2)+" 个角";
	}
	public void addPoint(int x,int y) {
		xBase=x;
		yBase=y;
	}
	public void moveObject(int xBuff,int yBuff) {
		super.moveObject(xBuff,yBuff);
		xBase+=xBuff;
		yBase+=yBuff;
	}
	public void draw(Graphics2D g2d) {
		int len=getLength();
		int[] x=new int[len];
		int[] y=new int[len];
		for (int i=0; i<len; i++) {
			x[i]=(Integer)(X.get(i));
			y[i]=(Integer)(Y.get(i));
		}
//		g2d.drawPolyline(x,y,len);
		shape=new Polygon(x,y,len);
		/* */

		doDraw(g2d,shape);
		getXYs();
	}
	public void changeSize(int x,int y) {
		size[1]=Math.max(Math.abs(x-xBase),Math.abs(y-yBase));
		size[0]=size[1]/2;
		double rad=0.0;
		for (int i=0; i<radians*2; i++) {
			X.set(i,(int)(size[i%2]*Math.cos(rad))+xBase);
			Y.set(i,(int)(size[i%2]*Math.sin(rad))+yBase);
			rad+=increase;
		}
		getXYs();
		if (gradientPaint>0) {
			setGradientPaint(new Point(getMinX(),getMinY()),new Point(getMaxX(),getMaxY()));
		}
	}
	public int getMinX() {
		return x1;
	}
	public int getMinY() {
		return y1;
	}
	public int getMaxX() {
		return x2;
	}
	public int getMaxY() {
		return y2;
	}
	public boolean canResizeObject(int x,int y) {
		int x2=getMaxX();
		int y2=getMaxY();
		if ((x>x2-4) && (y>y2-4) && (x<x2+4) && (y<y2+4))
			return true;
		else
			return false;
	}
	private void getXYs() {
		x1=getPointX(0);
		y1=getPointY(0);
		x2=x1;
		y2=y1;
		for (int i=0; i<getLength(); i++) {
			int xx=getPointX(i);
			int yy=getPointY(i);
			if (xx<x1)
				x1=xx;
			if (yy<y1)
				y1=yy;
			if (xx>x2)
				x2=xx;
			if (yy>y2)
				y2=yy;
		}
	}
	protected boolean isChangablePoint(int x,int y) {
		if (x==getMaxX() && y==getMaxY())
			return true;
		else
			return false;
	}
}