可以用Java Media APIs,它里面有一个Java 2D API,这个函数包可以实现绘制平面图形,我给你写个例子吧,:)import java.awt.*;
import java.awt.geom.*;
import java.awt.event.*;
import java.awt.font.TextLayout;
import java.awt.font.FontRenderContext;
import javax.swing.*;
public class Dash extends JApplet { public void init() {
setBackground(Color.white);
}
public void drawDemo(int w, int h, Graphics2D g2) { FontRenderContext frc = g2.getFontRenderContext();
Font font = g2.getFont();
TextLayout tl = new TextLayout("Dashes", font, frc);
float sw = (float) tl.getBounds().getWidth();
float sh = (float) tl.getAscent() + tl.getDescent();
g2.setColor(Color.black);
tl.draw(g2, (float) (w/2-sw/2), sh+5);
BasicStroke dotted = new BasicStroke(3, BasicStroke.CAP_ROUND,
BasicStroke.JOIN_ROUND, 0, new float[]{0,6,0,6}, 0);
g2.setStroke(dotted);
g2.drawRect(3,3,w-6,h-6); int x = 0; int y = h-34;
BasicStroke bs[] = new BasicStroke[6]; float j = 1.1f;
for (int i = 0; i < bs.length; i++, j += 1.0f) {
float dash[] = { j };
BasicStroke b = new BasicStroke(1.0f, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_MITER, 10.0f, dash, 0.0f);
g2.setStroke(b);
g2.drawLine(20, y, w-20, y);
bs[i] = new BasicStroke(3.0f, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_MITER, 10.0f, dash, 0.0f);
y += 5;
} Shape shape = null;
y = 0;
for (int i = 0; i < 6; i++) {
x = (i == 0 || i == 3) ? (w/3-w/5)/2 : x + w/3;
y = (i <= 2) ? (int) sh+h/12 : h/2; g2.setStroke(bs[i]);
g2.translate(x, y);
switch (i) {
case 0 : shape = new Arc2D.Float(0.0f, 0.0f, w/5, h/4, 45, 270, Arc2D.PIE);
break;
case 1 : shape = new Ellipse2D.Float(0.0f, 0.0f, w/5, h/4);
break;
case 2 : shape = new RoundRectangle2D.Float(0.0f, 0.0f, w/5, h/4, 10.0f, 10.0f);
break;
case 3 : shape = new Rectangle2D.Float(0.0f, 0.0f, w/5, h/4);
break;
case 4 : shape = new QuadCurve2D.Float(0.0f,0.0f,w/10, h/2,w/5,0.0f);
break;
case 5 : shape = new CubicCurve2D.Float(0.0f,0.0f,w/15,h/2, w/10,h/4,w/5,0.0f);
break;
} g2.draw(shape);
g2.translate(-x, -y);
}
}
public void paint(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
Dimension d = getSize();
g2.setBackground(getBackground());
g2.clearRect(0, 0, d.width, d.height);
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
drawDemo(d.width, d.height, g2);
}
public static void main(String argv[]) {
final Dash demo = new Dash();
demo.init();
JFrame f = new JFrame("Java 2D(TM) Demo - Dash");
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {System.exit(0);}
});
f.getContentPane().add("Center", demo);
f.pack();
f.setSize(new Dimension(400,300));
f.show();
}
}
import java.awt.geom.*;
import java.awt.event.*;
import java.awt.font.TextLayout;
import java.awt.font.FontRenderContext;
import javax.swing.*;
public class Dash extends JApplet { public void init() {
setBackground(Color.white);
}
public void drawDemo(int w, int h, Graphics2D g2) { FontRenderContext frc = g2.getFontRenderContext();
Font font = g2.getFont();
TextLayout tl = new TextLayout("Dashes", font, frc);
float sw = (float) tl.getBounds().getWidth();
float sh = (float) tl.getAscent() + tl.getDescent();
g2.setColor(Color.black);
tl.draw(g2, (float) (w/2-sw/2), sh+5);
BasicStroke dotted = new BasicStroke(3, BasicStroke.CAP_ROUND,
BasicStroke.JOIN_ROUND, 0, new float[]{0,6,0,6}, 0);
g2.setStroke(dotted);
g2.drawRect(3,3,w-6,h-6); int x = 0; int y = h-34;
BasicStroke bs[] = new BasicStroke[6]; float j = 1.1f;
for (int i = 0; i < bs.length; i++, j += 1.0f) {
float dash[] = { j };
BasicStroke b = new BasicStroke(1.0f, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_MITER, 10.0f, dash, 0.0f);
g2.setStroke(b);
g2.drawLine(20, y, w-20, y);
bs[i] = new BasicStroke(3.0f, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_MITER, 10.0f, dash, 0.0f);
y += 5;
} Shape shape = null;
y = 0;
for (int i = 0; i < 6; i++) {
x = (i == 0 || i == 3) ? (w/3-w/5)/2 : x + w/3;
y = (i <= 2) ? (int) sh+h/12 : h/2; g2.setStroke(bs[i]);
g2.translate(x, y);
switch (i) {
case 0 : shape = new Arc2D.Float(0.0f, 0.0f, w/5, h/4, 45, 270, Arc2D.PIE);
break;
case 1 : shape = new Ellipse2D.Float(0.0f, 0.0f, w/5, h/4);
break;
case 2 : shape = new RoundRectangle2D.Float(0.0f, 0.0f, w/5, h/4, 10.0f, 10.0f);
break;
case 3 : shape = new Rectangle2D.Float(0.0f, 0.0f, w/5, h/4);
break;
case 4 : shape = new QuadCurve2D.Float(0.0f,0.0f,w/10, h/2,w/5,0.0f);
break;
case 5 : shape = new CubicCurve2D.Float(0.0f,0.0f,w/15,h/2, w/10,h/4,w/5,0.0f);
break;
} g2.draw(shape);
g2.translate(-x, -y);
}
}
public void paint(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
Dimension d = getSize();
g2.setBackground(getBackground());
g2.clearRect(0, 0, d.width, d.height);
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
drawDemo(d.width, d.height, g2);
}
public static void main(String argv[]) {
final Dash demo = new Dash();
demo.init();
JFrame f = new JFrame("Java 2D(TM) Demo - Dash");
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {System.exit(0);}
});
f.getContentPane().add("Center", demo);
f.pack();
f.setSize(new Dimension(400,300));
f.show();
}
}
Polygon p;
public Arrow3(Point start, Point end, Color color,float lineWidth)
{
super(color,lineWidth);
position = new Point(Math.min(start.x, end.x), Math.min(start.y, end.y));
createPath(position,end); }
public java.awt.Rectangle getBounds()
{
return getBounds(arrow3.getBounds()); } Point RotatePoint( Point srcPoint, Point basePoint,
double dAngle)
{// 求得源点srcPoint绕basePoint旋转dAngle角度后的点
Point p=new Point();
double cosv = Math.cos(dAngle) ; // cos value
double sinv = Math.sin(dAngle) ;
p.x =(int)(srcPoint.x * cosv - srcPoint.y * sinv +
(1.- cosv) * basePoint.x + basePoint.y * sinv);
p.y =(int)(sinv * srcPoint.x + cosv * srcPoint.y +
(1.- cosv) * basePoint.y - sinv * basePoint.x);
return p;
}
public void createPath(Point start,Point end) {
Point PointRotate=new Point(); double dDist=Math.sqrt((end.x-start.x)*
(end.x-start.x)+
(end.y-start.y)*
(end.y-start.y));
if (dDist<1.0) dDist=1.0;
double dRatio=14/dDist;
PointRotate.x=(int)((end.x-start.x)*dRatio+end.x);
PointRotate.y=(int)((end.y-start.y)*dRatio+end.y);
UpEnd=RotatePoint(PointRotate,end,-Math.PI*7/8);
DownEnd=RotatePoint(PointRotate,end,Math.PI*7/8); Point2D.Float point=new Point2D.Float();
arrow3=new GeneralPath();
arrow3.moveTo(0,0) ;
arrow3.lineTo(end.x-position.x,end.y-position.y) ;
point=(Point2D.Float)arrow3.getCurrentPoint();
arrow3.lineTo(UpEnd.x-position.x,UpEnd.y-position.y);
arrow3.moveTo(point.x,point.y) ;
arrow3.lineTo(DownEnd.x-position.x,DownEnd.y-position.y);
int[] xPoints=new int[3];
int[] yPoints=new int[3];
xPoints[0]=UpEnd.x-position.x;
yPoints[0]=UpEnd.y-position.y;
xPoints[1]=DownEnd.x-position.x;
yPoints[1]=DownEnd.y-position.y;
xPoints[2]=end.x-position.x;
yPoints[2]=end.y-position.y;
p=new Polygon(xPoints,yPoints,3);
arrow3.append(p,false); } public void modify(Point start, Point end)
{
createPath(position,end);
}
public void draw(Graphics2D g2D)
{
AffineTransform old = g2D.getTransform(); // Save the current transform g2D.translate(position.x, position.y); // Translate to position
g2D.scale(zoomX,zoomY);
g2D.rotate(angle); // Rotate about position
g2D.setPaint(highlighted ? Color.magenta : color); // Set the element color
g2D.setStroke(new BasicStroke(lineWidth)) ;
g2D.fillPolygon(p) ;
g2D.draw(arrow3);
// Draw the element
g2D.setTransform(old); // Restore original transform }
private void writeObject(ObjectOutputStream out) throws IOException
{ } private void readObject(java.io.ObjectInputStream in) throws IOException, ClassNotFoundException
{ }
GeneralPath arrow3;
}
org\w3c\dom
从新贴一下改后的代码:
public class Arrow3 extends Entity{ Point UpEnd,DownEnd;
Polygon p;
public Arrow3(Point start, Point end, Color color,float lineWidth)
{
super(color,lineWidth);
position = new Point(Math.min(start.x, end.x), Math.min(start.y, end.y));
createPath(position,end); }
public java.awt.Rectangle getBounds()
{
return getBounds(arrow3.getBounds()); } Point RotatePoint( Point srcPoint, Point basePoint,
double dAngle)
{// 求得源点srcPoint绕basePoint旋转dAngle角度后的点
Point p=new Point();
double cosv = Math.cos(dAngle) ; // cos value
double sinv = Math.sin(dAngle) ;
p.x =(int)(srcPoint.x * cosv - srcPoint.y * sinv +
(1.- cosv) * basePoint.x + basePoint.y * sinv);
p.y =(int)(sinv * srcPoint.x + cosv * srcPoint.y +
(1.- cosv) * basePoint.y - sinv * basePoint.x);
return p;
}
public void createPath(Point start,Point end) {
Point PointRotate=new Point();
double dDist=Math.sqrt((end.x-start.x)*(end.x-start.x)+(end.y-start.y)*(end.y-start.y));
if (dDist<1.0) dDist=1.0;
double dRatio=14/dDist;
PointRotate.x=(int)((end.x-start.x)*dRatio+end.x);
PointRotate.y=(int)((end.y-start.y)*dRatio+end.y);
UpEnd=RotatePoint(PointRotate,end,-Math.PI*7/8);
DownEnd=RotatePoint(PointRotate,end,Math.PI*7/8);
Point2D.Float point=new Point2D.Float();
arrow3=new GeneralPath();
arrow3.moveTo(0,0) ;
arrow3.lineTo(end.x-position.x,end.y-position.y) ;
int[] xPoints=new int[3];
int[] yPoints=new int[3];
xPoints[0]=UpEnd.x-position.x;
yPoints[0]=UpEnd.y-position.y;
xPoints[1]=DownEnd.x-position.x;
yPoints[1]=DownEnd.y-position.y;
xPoints[2]=end.x-position.x;
yPoints[2]=end.y-position.y;
p=new Polygon(xPoints,yPoints,3);
arrow3.append(p,false); }
public void modify(Point start, Point end)
{
createPath(position,end);
}
public void draw(Graphics2D g2D)
{
AffineTransform old = g2D.getTransform(); // Save the current transform
g2D.translate(position.x, position.y); // Translate to position
g2D.scale(zoomX,zoomY);
g2D.rotate(angle); // Rotate about position
g2D.setPaint(highlighted ? Color.magenta : color); // Set the element color
g2D.setStroke(new BasicStroke(lineWidth)) ;
g2D.fillPolygon(p) ;
g2D.draw(arrow3);
// Draw the element
g2D.setTransform(old); // Restore original transform }
private void writeObject(ObjectOutputStream out) throws IOException
{
PathIterator iterator = arrow3.getPathIterator(new AffineTransform());
Vector coords = new Vector(); // Stores coordinate objects
int maxCoordCount = 6; // Maximum coordinates for a segment
float[] temp = new float[maxCoordCount]; // Stores segment data
int result = iterator.currentSegment(temp); // Get first segment
if(!(result == iterator.SEG_MOVETO)) // ... should be moveTo
throw new IOException("No starting moveTo for curve");
iterator.next();
result=iterator.currentSegment(temp) ;
coords.add(new Float(temp[0])); ///////////////line to End
coords.add(new Float(temp[1]));
iterator.next() ;
/////需要添加Polygon段,请帮忙
}
private void readObject(java.io.ObjectInputStream in) throws IOException, ClassNotFoundException
{
Vector coords=(Vector)in.readObject() ;
arrow3=new GeneralPath();
arrow3.moveTo(0,0) ;
arrow3.lineTo(((Float)coords.get(0)).floatValue(),((Float)coords.get(1)).floatValue() ) ;//line to End
int[] xPoints=new int[3];
int[] yPoints=new int[3];
xPoints[0]=((Float)coords.get(0)).intValue() ;
yPoints[0]=((Float)coords.get(1)).intValue() ;
xPoints[1]=((Float)coords.get(2)).intValue() ;
yPoints[1]=((Float)coords.get(3)).intValue() ;
xPoints[2]=((Float)coords.get(4)).intValue() ;
yPoints[2]=((Float)coords.get(5)).intValue() ;
p=new Polygon(xPoints,yPoints,3);
arrow3.append(p,false); }
GeneralPath arrow3;
}