package choiceupdate; import java.awt.*; import java.awt.event.*; import java.applet.*; import com.borland.jbcl.layout.*; public class develop extends Applet { boolean isStandalone = false; String str1,str2,str3; XYLayout xYLayout1 = new XYLayout(); Choice choice1 = new Choice(); TextField text1 = new TextField(); TextField text2 = new TextField(); TextField text3 = new TextField(); Label label1 = new Label(); Label label2 = new Label(); Label label3 = new Label(); Label label4 = new Label(); /**Get a parameter value*/ public String getParameter(String key, String def) { return isStandalone ? System.getProperty(key, def) : (getParameter(key) != null ? getParameter(key) : def); } /**Construct the applet*/ public develop() { } /**Initialize the applet*/ public void init() { try { jbInit(); } catch(Exception e) { e.printStackTrace(); } } /**Component initialization*/ private void jbInit() throws Exception { this.setLayout(xYLayout1); choice1.setFont(new java.awt.Font("Dialog", 0, 16)); choice1.addItemListener(new java.awt.event.ItemListener() { public void itemStateChanged(ItemEvent e) { choice1_itemStateChanged(e); } }); label1.setFont(new java.awt.Font("Dialog", 0, 16)); label1.setText("图形"); label2.setFont(new java.awt.Font("Dialog", 0, 16)); label2.setText("高度（半径）"); label3.setFont(new java.awt.Font("Dialog", 0, 16)); label3.setText("长度"); label4.setFont(new java.awt.Font("Dialog", 0, 16)); label4.setText("角度"); text1.setText("10"); text1.addFocusListener(new java.awt.event.FocusAdapter() { public void focusLost(FocusEvent e) { text1_focusLost(e); } }); text2.setText("10"); text2.addFocusListener(new java.awt.event.FocusAdapter() { public void focusLost(FocusEvent e) { text2_focusLost(e); } }); text3.setText("10"); text3.addFocusListener(new java.awt.event.FocusAdapter() { public void focusLost(FocusEvent e) { text3_focusLost(e); } }); this.add(choice1, new XYConstraints(137, 12, 81, 21)); choice1.addItem("圆形"); choice1.addItem("方形"); choice1.addItem("弧形"); this.add(text1, new XYConstraints(137, 40, 60, -1)); this.add(text2, new XYConstraints(137, 70, 60, -1)); this.add(text3, new XYConstraints(137, 100, 60, -1)); this.add(label1, new XYConstraints(76, 12, 54, -1)); this.add(label2, new XYConstraints(28, 40, 102, -1)); this.add(label3, new XYConstraints(76, 70, 54, -1)); this.add(label4, new XYConstraints(76, 100, 54, -1)); } /**Get Applet information*/ public String getAppletInfo() { return "Applet Information"; } /**Get parameter info*/ public String[][] getParameterInfo() { return null; } void choice1_itemStateChanged(ItemEvent e) { repaint(); } public void paint(Graphics g){ g.clearRect(100,150,200,150); g.setColor(Color.red); switch(choice1.getSelectedIndex() ){ case 0: str1=text1.getText() ; str2=text2.getText() ; if (str1==null) str1="1"; if (str2==null) str2="1"; try{ int h=Integer.parseInt(str1); int w=Integer.parseInt(str2); g.drawOval(100,150,w,h); } catch(Exception e) { e.printStackTrace(); } case 1: str1=text1.getText() ; str2=text2.getText() ; if (str1==null) str1="1"; if (str2==null) str2="1"; try{ int h=Integer.parseInt(str1); int w=Integer.parseInt(str2); g.drawRect(100,150,w,h); } catch(Exception e) { e.printStackTrace(); } case 2: str1=text1.getText() ; str2=text2.getText() ; str3=text3.getText() ; if (str1==null) str1="1"; if (str2==null) str2="1"; if (str3==null) str3="1"; try{ int h=Integer.parseInt(str1); int w=Integer.parseInt(str2); int a=Integer.parseInt(str3); g.drawArc(100,150,w,h,0,a); } catch(Exception e) { e.printStackTrace(); } } } void text1_focusLost(FocusEvent e) { repaint(); } void text3_focusLost(FocusEvent e) { repaint(); } void text2_focusLost(FocusEvent e) { repaint(); } }
