一、問答題
1．2個參數(shù)。
2．6個參數(shù)。
3．7個參數(shù)。
4．（1）創(chuàng)建AffineTransform對象，（2）進行旋轉操作，（3）繪制旋轉的圖形。
二、編寫程序
1.??import java.awt.*;
import javax.swing.*;
class MyCanvas extends Canvas {
??static int pointX[]=new int[5],
???????pointY[]=new int[5];
???public void paint(Graphics g) {
??????g.translate(200,200) ; ???//進行坐標變換,將新的坐標原點設置為(200,200)。
??????pointX[0]=0;
??????pointY[0]=-120;
??????double arcAngle=(72*Math.PI)/180;
??????for(int i=1;i<5;i++) {
?????????pointX[i]=(int)(pointX[i-1]*Math.cos(arcAngle)-pointY[i-1]*Math.sin(arcAngle));
?????????pointY[i]=(int)(pointY[i-1]*Math.cos(arcAngle)+pointX[i-1]*Math.sin(arcAngle));
??????}
??????g.setColor(Color.red);
??????int starX[]={pointX[0],pointX[2],pointX[4],pointX[1],pointX[3],pointX[0]};
??????int starY[]={pointY[0],pointY[2],pointY[4],pointY[1],pointY[3],pointY[0]};
??????g.drawPolygon(starX,starY,6);
???}
}
public class E {
???public static void main(String args[]) {
??????JFrame f=new JFrame();
??????f.setSize(500,450);
??????f.setVisible(true);
??????MyCanvas canvas=new MyCanvas();
??????f.add(canvas,"Center");
??????f.validate();
??????f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
??}
}
2.???import java.awt.*;
import javax.swing.*;
import java.awt.geom.*;
class MyCanvas extends Canvas {
???public void paint(Graphics g) {
?????g.setColor(Color.red) ;
??????Graphics2D g_2d=(Graphics2D)g;
??????QuadCurve2D quadCurve=
??????new ?QuadCurve2D.Double(2,10,51,90,100,10);
??????g_2d.draw(quadCurve);
??????quadCurve.setCurve(2,100,51,10,100,100);
??????g_2d.draw(quadCurve);
???}
}
public class E {
???public static void main(String args[]) {
??????JFrame f=new JFrame();
??????f.setSize(500,450);
??????f.setVisible(true);
??????MyCanvas canvas=new MyCanvas();
??????f.add(canvas,"Center");
??????f.validate();
??????f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
??}
}
3.???import java.awt.*;
import javax.swing.*;
import java.awt.geom.*;
class MyCanvas extends Canvas {
???public void paint(Graphics g) {
??????g.setColor(Color.red) ;
??????Graphics2D g_2d=(Graphics2D)g;
??????CubicCurve2D cubicCurve=
??????new CubicCurve2D.Double(0,70,70,140,140,0,210,70);
??????g_2d.draw(cubicCurve);
???}
}
public class E {
???public static void main(String args[]) {
??????JFrame f=new JFrame();
??????f.setSize(500,450);
??????f.setVisible(true);
??????MyCanvas canvas=new MyCanvas();
??????f.add(canvas,"Center");
??????f.validate();
??????f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
??}
}
4.???import java.awt.*;
import javax.swing.*;
import java.awt.geom.*;
class Flower extends Canvas
{ ?public void paint(Graphics g)
???{ ?Graphics2D ?g_2d=(Graphics2D)g;
??????//花葉兩邊的曲線: ?
??????QuadCurve2D
??????curve_1=new ?QuadCurve2D.Double(200,200,150,160,200,100);
??????CubicCurve2D curve_2=
??????new ?CubicCurve2D.Double(200,200,260,145,190,120,200,100);
??????//花葉中的紋線:
??????Line2D line=new Line2D.Double(200,200,200,110); ?
??????QuadCurve2D leaf_line1=
??????new ?QuadCurve2D.Double(200,180,195,175,190,170);
??????QuadCurve2D leaf_line2=
??????new ?QuadCurve2D.Double(200,180,210,175,220,170);
??????QuadCurve2D leaf_line3=
??????new ?QuadCurve2D.Double(200,160,195,155,190,150);
??????QuadCurve2D leaf_line4=
??????new ?QuadCurve2D.Double(200,160,214,155,220,150); ??
??????//利用旋轉來繪制花朵: ?
??????AffineTransform trans=new AffineTransform();
??????for(int i=0;i<6;i++)
??????{ ??trans.rotate(60*Math.PI/180,200,200);
??????????g_2d.setTransform(trans);
??????????GradientPaint gradient_1=
??????????new GradientPaint(200,200,Color.green,200,100,Color.yellow);
??????????g_2d.setPaint(gradient_1);
??????????g_2d.fill(curve_1);
??????????GradientPaint gradient_2=new
??????????GradientPaint(200,145,Color.green,260,145,Color.red,true);
??????????g_2d.setPaint(gradient_2);
??????????g_2d.fill(curve_2);
??????????Color c3=new Color(0,200,0); g_2d.setColor(c3);
??????????g_2d.draw(line);
??????????g_2d.draw(leaf_line1); g_2d.draw(leaf_line2); ?
??????????g_2d.draw(leaf_line3); g_2d.draw(leaf_line4);
??????}
??????//花瓣中間的花蕾曲線:
??????QuadCurve2D center_curve_1=
??????new QuadCurve2D.Double(200,200,190,185,200,180);
??????AffineTransform trans_1=new AffineTransform();
??????for(int i=0;i<12;i++)
??????{ ?trans_1.rotate(30*Math.PI/180,200,200);
?????????g_2d.setTransform(trans_1);
?????????GradientPaint gradient_3=
?????????new GradientPaint(200,200,Color.red,200,180,Color.yellow);
?????????g_2d.setPaint(gradient_3);
?????????g_2d.fill(center_curve_1);
??????}
???}
}
public class E {
???public static void main(String args[]) {
??????JFrame f=new JFrame();
??????f.setSize(500,450);
??????f.setVisible(true);
??????Flower canvas=new Flower();
??????f.add(canvas,"Center");
??????f.validate();
??????f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
??}
}
5．?import java.awt.*;
import javax.swing.*;
import java.awt.geom.*;
class Moon extends Canvas
{ ?public void paint(Graphics g)
???{ ?Graphics2D g_2d=(Graphics2D)g;
??????Ellipse2D ellipse1=
??????new Ellipse2D. Double (20,80,60,60),
??????ellipse2=
??????new Ellipse2D. Double (40,80,80,80);
??????g_2d.setColor(Color.white);
??????Area a1=new Area(ellipse1),
???????????a2=new Area(ellipse2);
??????a1.subtract(a2); ????????????//"差"
??????g_2d.fill(a1);
???}
}
public class E {
???public static void main(String args[]) {
??????JFrame f=new JFrame();
??????f.setSize(500,450);
??????f.setVisible(true);
??????Moon moon=new Moon();
??????moon.setBackground(Color.black);
??????f.add(moon,"Center");
??????f.validate();
??????f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
??}
}
