Sample of graphics, commands, and event handling.

November 20, 2011 — Azka Alifiandra

/*
 * @(#)Sample.java 1.9 01/06/08
 * Copyright (c) 1999-2001 Sun Microsystems, Inc. All Rights Reserved.
 */

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

/*
 * A quick sample of graphics, commands, and event handling.
 */
public class SampleCanvasMIDlet extends MIDlet implements CommandListener {
 Display display;
 Command exitCommand;
 Command backCommand;
 Command okCommand;
 SampleCanvas sample; // Instance of sample canvas

List itemMenu;
 List exclusiveList;
 List multipleList;
 TextBox textbox;
 Ticker ticker;
 Alert alert;
 Form form;
 StringItem stringItem;
 ImageItem imageItem;
 Image image;
 TextField textItem;
 ChoiceGroup choiceItem;
 DateField dateItem;
 Gauge gaugeItem;

public SampleCanvasMIDlet() {
 display = Display.getDisplay(this);
 exitCommand = new Command(”Exit”, Command.EXIT, 1);
 backCommand = new Command(”Back”, Command.BACK, 2);
 okCommand = new Command(”OK”, Command.OK, 3);

ticker = new Ticker(”Select an item to display”);
 itemMenu = new List(null, Choice.IMPLICIT);
 itemMenu.append(”Canvas”, null);
 itemMenu.append(”Form”, null);
 itemMenu.append(”Alert”, null);
 itemMenu.append(”TextBox”, null);
 itemMenu.append(”Exclusive List”, null);
 itemMenu.append(”Multiple Choice”, null);

itemMenu.setCommandListener(this);
 itemMenu.addCommand(exitCommand);
 itemMenu.setTicker(ticker);
 display.setCurrent(itemMenu);
 }

public void startApp () {
 }

public void destroyApp (boolean unconditional) {
 }

public void pauseApp () {
 }

public void commandAction(Command c, Displayable s) {
 if (c == backCommand) {
 display.setCurrent(itemMenu);
 } else if (s == itemMenu) {
 if (c == List.SELECT_COMMAND) {
 // Handle the item sected to be displayed
 int i = itemMenu.getSelectedIndex();
 switch (i) {
 case 0: // Show Sample canvas
 display.setCurrent(getCanvas());
 break;
 case 1: // Show the form
 display.setCurrent(getForm());
 break;
 case 2: // Show an alert
 display.setCurrent(getAlert(”Warning”, 
 “This window will dismiss in two seconds.”));
 break;
 case 3: // Show TextBox
 display.setCurrent(getTextBox());
 break;
 case 4: // Show Exclusive list
 display.setCurrent(getExclusiveList());
 break;
 case 5: // Show Multiple List
 display.setCurrent(getMultipleList());
 break;
 }
 } else if (c == exitCommand) {
 notifyDestroyed();
 }
 } else if (s == exclusiveList) {
 int i = exclusiveList.getSelectedIndex();
 String value = exclusiveList.getString(i);
 alert = getAlert(”Border selected:”, value);
 display.setCurrent(alert, itemMenu);
 } else if (s == multipleList) {
 StringBuffer b = new StringBuffer();
 for (int i = 0; i <= 2; i++) {
 if (multipleList.isSelected(i)) {
 b.append(multipleList.getString(i));
 b.append(”n”);
 }
 }
 alert = getAlert(”Colors selected:”, b.toString());
 display.setCurrent(alert, itemMenu);
 } else if (s == textbox) {
 String value = textbox.getString();
 alert = getAlert(”Text Entered:”, value);
 display.setCurrent(alert, itemMenu);
 } else if (s == form) {
 alert = getAlert(”Image options saved”, “”);
 display.setCurrent(alert, itemMenu);
 }
 }

SampleCanvas getCanvas() {
 if (sample == null) {
 sample = new SampleCanvas();
 sample.addCommand(backCommand);
 sample.setCommandListener(this);
 }
 return sample;
 }

List getExclusiveList() {
 if (exclusiveList == null) {
 exclusiveList = new List(”Border Style”, Choice.EXCLUSIVE);
 exclusiveList.append(”None”, null);
 exclusiveList.append(”Plain”, null);
 exclusiveList.append(”Fancy”, null);
 exclusiveList.addCommand(backCommand);
 exclusiveList.addCommand(okCommand);
 exclusiveList.setCommandListener(this);
 }
 return exclusiveList;
 }

List getMultipleList() {
 if (multipleList == null) {
 multipleList = new List(”Colors to mix”, Choice.MULTIPLE);
 multipleList.append(”Red”, null);
 multipleList.append(”Green”, null);
 multipleList.append(”Blue”, null);
 multipleList.addCommand(backCommand);
 multipleList.addCommand(okCommand);
 multipleList.setCommandListener(this);
 }
 return multipleList;
 }

TextBox getTextBox() {
 if (textbox == null) {
 textbox = new TextBox(”Enter a phone number”,””, 40,
 TextField.PHONENUMBER);
 textbox.addCommand(backCommand);
 textbox.addCommand(okCommand);
 textbox.setCommandListener(this);
 }
 return textbox;
 }

Alert getAlert(String title, String contents) {
 if (alert == null) {
 alert = new Alert(title);
 alert.setType(AlertType.WARNING);
 alert.setTimeout(2000);
 alert.setString(contents); 
 } else {
 alert.setTitle(title);
 alert.setString(contents);
 }
 return alert;
 }

Form getForm() {
 if (form == null) {
 form = new Form(”Options”);

try {
 image = Image.createImage(”/images/PhotoAlbum.png”);
 imageItem = new ImageItem(”Preview:”, image, 
 ImageItem.LAYOUT_NEWLINE_BEFORE, “Mountain”);
 form.append(imageItem);
 } catch (java.io.IOException ex) {
 }

textItem = new TextField(”Title:”, “Mountain”, 32,
 TextField.ANY);
 form.append(textItem);

dateItem = new DateField(”Date:”, DateField.DATE);
 dateItem.setDate(new java.util.Date());
 form.append(dateItem);

choiceItem = new ChoiceGroup(”Size:”, Choice.EXCLUSIVE);
 choiceItem.append(”Small”, null);
 choiceItem.append(”Large”, null);
 form.append(choiceItem);

gaugeItem = new Gauge(”Speed:”, true, 10, 5);
 form.append(gaugeItem);

form.addCommand(backCommand);
 form.addCommand(okCommand);
 form.setCommandListener(this);
 }
 return form;
 }
}

class SampleCanvas extends Canvas {
 int x, y; // Location of cross hairs
 String event = “”; // Last key event type
 int keyCode; // Last keyCode pressed
 Font font; // Font used for drawing text
 int fh; // height of the font
 int w, h; // width and height of the canvas
 int titleHeight; // Height of the title
 int pieSize; // Size of the Pie chart used for width and height
 int barSize; // Size of the Bar chart used for width and height
 int eventHeight; // Size of the event region
 int pad; // Padding used between items

SampleCanvas() {
 w = getWidth();
 h = getHeight();
 font = Font.getFont(Font.FACE_SYSTEM,
 Font.STYLE_PLAIN, Font.SIZE_SMALL);
 fh = font.getHeight();

/* Compute the sizes of the bar and pie charts
 * It should use all the space except for the title
 * and event regions.
 * Don’t let the charts get too small
 */
 pad = 2;
 titleHeight = fh + pad * 2;
 eventHeight = fh * 3;
 barSize = h – (titleHeight + pad) – (eventHeight + pad);
 if (barSize < 20) // Don’t let them get too small
 barSize = 20;
 if (barSize > (w – pad) / 2) // Shrink to 1/2 width
 barSize = (w – pad) / 2;
 pieSize = barSize;
 }

protected void keyPressed(int key) {
 keyCode = key;
 event = “Pressed”;
 handleActions(key);
 repaint();
 }

protected void keyRepeated(int key) {
 keyCode = key;
 event = “Repeated”;
 handleActions(key);
 repaint();
 }

protected void keyReleased(int key) {
 keyCode = key;
 event = “Released”;
 repaint();
 }

protected void pointerPressed(int x, int y) {
 this.x = x;
 this.y = y;
 keyCode = 0;
 event = “Pressed”;
 repaint();
 }
 protected void pointerReleased(int x, int y) {
 this.x = x;
 this.y = y;
 keyCode = 0;
 event = “Released”;
 repaint();
 }

protected void pointerDragged(int x, int y) {
 this.x = x;
 this.y = y;
 keyCode = 0;
 event = “Dragged”;
 }

void handleActions(int keyCode) {
 int action = getGameAction(keyCode);
 switch (action) {
 case LEFT:
 x -= 1;
 break;
 case RIGHT:
 x += 1;
 break;
 case UP:
 y -= 1;
 break;
 case DOWN:
 y += 1;
 break;
 }
 }

protected void paint(Graphics g) {

g.setFont(font);
 g.setGrayScale(255);
 g.fillRect(0, 0, w, h);

x = (x < 0) ? w – 1 : x;
 y = (y < 0) ? h – 1 : y;
 x = x % w;
 y = y % h;

// Draw Fill and outline for background of title Text
 int swidth = pad * 2 + font.stringWidth(”Pie and Bar Samples”);
 int title_x = (w – swidth)/2;

g.setGrayScale(128);
 g.fillRoundRect(title_x, 0, swidth, fh, 5, 5);
 g.setGrayScale(0);
 g.drawRoundRect(title_x, 0, swidth, fh, 5, 5);

// Sample Text
 g.setColor(0, 0, 0);
 g.drawString(”Pie and Bar Samples”, 
 title_x + pad, pad, Graphics.TOP|Graphics.LEFT);

// Translate to below title text
 g.translate(0, titleHeight + pad);

/*
 * Draw pie chart on the left side
 * using the barSize for width and height
 */
 g.setColor(255, 0, 0);
 g.fillArc(0, 0, pieSize, pieSize, 45, 270);
 g.setColor(0, 255, 0);
 g.fillArc(0, 0, pieSize, pieSize, 0, 45);
 g.setColor(0, 0, 255);
 g.fillArc(0, 0, pieSize, pieSize, 0, -45);
 g.setColor(0);
 g.drawArc(0, 0, pieSize, pieSize, 0, 360);

// Draw Bar chart on right side of the display
 // scale the values to the pieSize maximum value
 int yorig = barSize;
 int h1 = barSize / 3, h2 = barSize / 2, h3 = barSize;
 int avg = (h1 + h2 + h3) / 3;

// Move over to draw Bar chart
 g.translate((w + pad) / 2, 0);

int bw = pieSize / 7;
 if (bw < 2)
 bw = 2;
 g.setColor(255, 0, 0);
 g.fillRect(bw*1, yorig-h1, bw+1, h1);
 g.setColor(0, 255, 0);
 g.fillRect(bw*3, yorig-h2, bw+1, h2);
 g.setColor(0, 0, 255);
 g.fillRect(bw*5, yorig-h3, bw+1, h3);
 g.setColor(0);
 g.drawRect(bw*1, yorig-h1, bw, h1);
 g.drawRect(bw*3, yorig-h2, bw, h2);
 g.drawRect(bw*5, yorig-h3, bw, h3);

// Draw axis for bar chart.
 g.setGrayScale(0);
 g.drawLine(0, 0, 0, yorig);
 g.drawLine(0, yorig, barSize, yorig);
 g.setStrokeStyle(Graphics.DOTTED);
 g.drawLine(0, yorig – avg, barSize, yorig-avg);
 g.setStrokeStyle(Graphics.SOLID);

// Restore to left and move down
 g.translate(-(w + pad) / 2, pieSize + pad);

// Draw the key and pointer status
 g.setColor(128, 128, 128);
 int col1 = font.stringWidth(”Action:”);
 g.drawString(”Key: “, col1, 0,
 Graphics.TOP|Graphics.RIGHT);
 g.drawString(keyString(keyCode), col1, 0,
 Graphics.TOP|Graphics.LEFT);
 g.drawString(”Action:”, col1, fh,
 Graphics.TOP|Graphics.RIGHT);
 g.drawString(actionString(keyCode), col1, fh,
 Graphics.TOP|Graphics.LEFT);
 g.drawString(”Event:”, col1, fh*2,
 Graphics.TOP|Graphics.RIGHT);
 g.drawString(event, col1, fh*2,
 Graphics.TOP|Graphics.LEFT);
 int col2 = 80;
 g.drawString(”x:”, col2, 0,
 Graphics.TOP|Graphics.RIGHT);
 g.drawString(Integer.toString(x), col2, 0,
 Graphics.TOP|Graphics.LEFT);
 g.drawString(”y:”, col2, fh,
 Graphics.TOP|Graphics.RIGHT);
 g.drawString(Integer.toString(y), col2, fh,
 Graphics.TOP|Graphics.LEFT);

// Restore the origin and draw the crosshairs on top
 g.translate(-g.getTranslateX(), -g.getTranslateY());

g.setColor(0, 0, 0);
 g.drawLine(x, y – 5, x, y + 5);
 g.drawLine(x – 5, y, x + 5, y);
 }

String keyString(int keyCode) {
 if (keyCode == 0) {
 return “”;
 }
 return Integer.toString(keyCode);
 }

String actionString(int keyCode) {
 if (keyCode == 0) {
 return “”;
 }

int action = getGameAction(keyCode);
 switch (action) {
 case FIRE:
 return “Fire”;
 case LEFT:
 return “Left”;
 case RIGHT:
 return “Right”;
 case DOWN:
 return “Down”;
 case UP:
 return “Up”;
 case GAME_A:
 return “Game A”;
 case GAME_B:
 return “Game B”;
 case GAME_C:
 return “Game C”;
 case GAME_D:
 return “Game D”;
 case 0:
 return “”;
 default:
 return Integer.toString(action);
 }
 }
}

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