Show various anchor points : 2D « J2ME « Java
Show various anchor points
/*--------------------------------------------------
* Text.java
*
* Show various anchor points
*
* Example from the book: Core J2ME Technology
* Copyright John W. Muchow http://www.CoreJ2ME.com
* You may use/modify for any non-commercial purpose
*-------------------------------------------------*/
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class Text extends MIDlet
{
private Display display; // The display
private TextCanvas canvas; // Canvas to display text
private AnchorPtList anchorPt; // List to query for anchor point
private int anchorPoint = Graphics.BASELINE | Graphics.HCENTER;
public Text()
{
display = Display.getDisplay(this);
canvas = new TextCanvas(this);
anchorPt = new AnchorPtList("Anchor point", List.IMPLICIT, this);
}
protected void startApp()
{
showCanvas();
}
protected void pauseApp()
{ }
protected void destroyApp( boolean unconditional )
{ }
public void showCanvas()
{
display.setCurrent(canvas);
}
public void showList()
{
display.setCurrent(anchorPt);
}
public int getAnchorPoint()
{
return anchorPoint;
}
public void setAnchorPoint(int anchorPoint)
{
this.anchorPoint = anchorPoint;
}
public void exitMIDlet()
{
destroyApp(true);
notifyDestroyed();
}
}
/*--------------------------------------------------
* Class TextCanvas
*
* Draw text at specified anchor point
*-------------------------------------------------*/
class TextCanvas extends Canvas implements CommandListener
{
private Command cmExit; // Exit midlet
private Command cmGetAnchorPt;
private Text midlet;
public TextCanvas(Text midlet)
{
this.midlet = midlet;
// Create commands & listen for events
cmExit = new Command("Exit", Command.EXIT, 1);
cmGetAnchorPt = new Command("Anchor", Command.SCREEN, 2);
addCommand(cmExit);
addCommand(cmGetAnchorPt);
setCommandListener(this);
}
/*--------------------------------------------------
* Draw text
*-------------------------------------------------*/
protected void paint(Graphics g)
{
int xcenter = getWidth() / 2,
ycenter = getHeight() / 2;
// Due to a bug in MIDP 1.0.3 we need to
// force a clear of the display
g.setColor(255, 255, 255); // White pen
g.fillRect(0, 0, getWidth(), getHeight());
g.setColor(0, 0, 0); // Black pen
// Choose a font
g.setFont(Font.getFont(Font.FACE_SYSTEM, Font.STYLE_PLAIN, Font.SIZE_MEDIUM));
// Draw a dot at the center of the display
g.drawLine(xcenter, ycenter, xcenter, ycenter);
// x and y are always at the center of the display
// Move the text around x and y based on the anchor point
g.drawString("go j2me!", xcenter, ycenter, midlet.getAnchorPoint());
}
/*--------------------------------------------------
* Exit midlet or show anchor point selection list
*-------------------------------------------------*/
public void commandAction(Command c, Displayable d)
{
if (c == cmExit)
midlet.exitMIDlet();
else if (c == cmGetAnchorPt)
{
midlet.showList();
}
}
}
/*--------------------------------------------------
* Class AnchorPtList
*
* List to query for an anchor point
*-------------------------------------------------*/
class AnchorPtList extends List implements CommandListener
{
private Text midlet;
public AnchorPtList(String title, int listType, Text midlet)
{
// Call list constructor
super(title, listType);
this.midlet = midlet;
append("Top/Left", null);
append("Top/HCenter", null);
append("Top/Right", null);
append("Baseline/Left", null);
append("Baseline/HCenter", null);
append("Baseline/Right", null);
append("Bottom/Left", null);
append("Bottom/HCenter", null);
append("Bottom/Right", null);
setCommandListener(this);
}
/*--------------------------------------------------
* Commands to set anchor point
*-------------------------------------------------*/
public void commandAction(Command c, Displayable s)
{
switch (getSelectedIndex())
{
case 0:
midlet.setAnchorPoint(Graphics.TOP | Graphics.LEFT);
break;
case 1:
midlet.setAnchorPoint(Graphics.TOP | Graphics.HCENTER);
break;
case 2:
midlet.setAnchorPoint(Graphics.TOP | Graphics.RIGHT);
break;
case 3:
midlet.setAnchorPoint(Graphics.BASELINE | Graphics.LEFT);
break;
case 4:
midlet.setAnchorPoint(Graphics.BASELINE | Graphics.HCENTER);
break;
case 5:
midlet.setAnchorPoint(Graphics.BASELINE | Graphics.RIGHT);
break;
case 6:
midlet.setAnchorPoint(Graphics.BOTTOM | Graphics.LEFT);
break;
case 7:
midlet.setAnchorPoint(Graphics.BOTTOM | Graphics.HCENTER);
break;
case 8:
midlet.setAnchorPoint(Graphics.BOTTOM | Graphics.RIGHT);
break;
default:
midlet.setAnchorPoint(Graphics.BASELINE | Graphics.HCENTER);
}
midlet.showCanvas();
}
}
