MID GRAFIKA KOMPUTER
PERGESERAN
A (50,150)
B (150,100)
C (150,200)
Delta x = 150-150-50
= -50
Delta y = 200-100-50
= 50
Inc_x = delta x/step
= -50/50=-1
Inc_y = delta y/step
= 50/50 = 1
Digeser sumbu x = -50 = delta X
Digeser sumbu y = -75 = delta y
-50 = x’-150
-75 = y’-50
X’= 100
Y’ = 25
Refleksika :
Int x = -50
Data pergeseran
Int y = -75
Listning;
package rotasi;
import java.awt.*;
import java.awt.event.*;
public class Rotasi extends Frame implements ActionListener{
int x = 200;
int y = 200;
public static void main(String[] args) {
Frame frame = new Rotasi();
frame.setSize(240, 360);
frame.setVisible(true);
}
public Rotasi() {
setTitle("AWT Demo");
// create menu
MenuBar mb = new MenuBar();
setMenuBar(mb);
Menu menu = new Menu("File");
mb.add(menu);
MenuItem mi = new MenuItem("Exit");
mi.addActionListener(this);
menu.add(mi);
// end program when window is closed
WindowListener l = new WindowAdapter() {
public void windowClosing(WindowEvent ev) {
System.exit(0);
}
};
this.addWindowListener(l);
// mouse event handler
MouseListener mouseListener = new MouseAdapter() {
public void mouseClicked(MouseEvent ev) {
x = 200;
y = 200;
repaint();
}
};
addMouseListener(mouseListener);
}
public void paint(Graphics g) {
int xasalA = 50; int yasalA = 150;
int xasalB = 150; int yasalB = 100;
int xasalC = 150; int yasalC = 200;
int sudut = -40;
g.setColor(Color.blue);
g.drawLine(xasalA,yasalA, xasalB,yasalB);
g.drawLine(xasalB,yasalB,xasalC,yasalC);
long xA = Math.round(x+(xasalA-x)*Math.cos(sudut-40)-(yasalA-y)*Math.sin(sudut-40));
long yA = Math.round(x+(xasalA-x)*Math.sin(sudut-40)-(yasalA-y)*Math.cos(sudut-40));
long xB = Math.round(x+(xasalB-x)*Math.cos(sudut-40)-(yasalB-y)*Math.sin(sudut-40));
long yB = Math.round(x+(xasalB-x)*Math.sin(sudut-40)-(yasalB-y)*Math.cos(sudut-40));
long xC = Math.round(x+(xasalC-x)*Math.cos(sudut-40)-(yasalC-y)*Math.sin(sudut-40));
long yC = Math.round(x+(xasalC-x)*Math.sin(sudut-40)-(yasalC-y)*Math.cos(sudut-40));
int xA1 = (int)xA; int yA1 = (int)yA;
int xB1 = (int)xB; int yB1 = (int)yB;
int xC1 = (int)xC; int yC1 = (int)yC;
g.drawLine(xA1,yA1, xB1,yB1);
g.drawLine(xB1,yB1, xC1,yC1);
}
public void actionPerformed(ActionEvent ev) {
String command = ev.getActionCommand();
if ("Exit".equals(command)) {
System.exit(0);
}
}
}
Output ;
