font_layout_text.java

本光盘是《J2ME无线移动游戏开发》一书的配套光盘

package ch10;

import javax.microedition.lcdui.*;

//该类实现字体布局的绘制
public class Font_Layout_Text
    extends Canvas {

  //声明一个代表基点水平取值的int型属性变量
  int H;

  //声明一个代表基点垂直取值的int型属性变量
  int V;

  //显示文本内容
  String text = "Example Text";

  /*
   5.构造器
   */
  public Font_Layout_Text() {
    H = Graphics.LEFT;
    V = Graphics.TOP;
  }

  //设置基点水平取值属性值
  public void setH(int H) {
    this.H = H;
  }

  //获取基点水平取值属性值
  public int getH() {
    return H;
  }

  //设置基点垂直取值属性值
  public void setV(int V) {
    this.V = V;
  }

  //获取基点垂直取值属性值
  public int getV() {
    return V;
  }

  /*
   6.绘制字体布局
   */
  protected void paint(Graphics g) {
    //获取屏幕宽度和高度
    int w = getWidth();
    int h = getHeight();

    //填充背景
    g.setColor(0xffffff);
    g.fillRect(0, 0, w, h);

    //创建字体
    g.setColor(0x000000);
    Font font = Font.getFont(Font.FACE_SYSTEM, Font.STYLE_PLAIN,
                             Font.SIZE_LARGE);
    g.setFont(font);

    //获取字符串宽度和高度
    int SWidth = font.stringWidth(text);
    int SHeight = font.getHeight();

    //绘制左上角基点文本布局
    g.setStrokeStyle(Graphics.DOTTED);
    g.drawRect( (w - SWidth) / 2, (h - SHeight) / 2, SWidth, SHeight);
    g.setColor(0x0000ff);
    g.drawString(text, (w - SWidth) / 2, (h - SHeight) / 2, H | V);

    g.setColor(0x000000);
    g.setStrokeStyle(Graphics.SOLID);

    //联合基点水平和垂直取值
    int f = H | V;

    //绘制各基点文本布局
    switch (f) {
      case 20:
        g.drawString("基点－左上", 0, 0, Graphics.LEFT | Graphics.TOP);
        break;
      case 68:
        g.drawString("基点－左基线", 0, 0, Graphics.LEFT | Graphics.TOP);
        g.setColor(0x00ff00);
        g.drawRect( (w - SWidth) / 2,
                   (h - SHeight) / 2 - font.getBaselinePosition(), SWidth,
                   SHeight);
        break;
      case 36:
        g.drawString("基点－左下", 0, 0, Graphics.LEFT | Graphics.TOP);
        g.setColor(0x00ff00);
        g.drawRect( (w - SWidth) / 2, (h - SHeight) / 2 - SHeight, SWidth,
                   SHeight);
        break;
      case 17:
        g.drawString("基点－中上", 0, 0, Graphics.LEFT | Graphics.TOP);
        g.setColor(0x00ff00);
        g.drawRect( (w - SWidth) / 2 - SWidth / 2, (h - SHeight) / 2, SWidth,
                   SHeight);
        break;
      case 65:
        g.drawString("基点－中基线", 0, 0, Graphics.LEFT | Graphics.TOP);
        g.setColor(0x00ff00);
        g.drawRect( (w - SWidth) / 2 - SWidth / 2,
                   (h - SHeight) / 2 - font.getBaselinePosition(), SWidth,
                   SHeight);
        break;
      case 33:
        g.drawString("基点－中下", 0, 0, Graphics.LEFT | Graphics.TOP);
        g.setColor(0x00ff00);
        g.drawRect( (w - SWidth) / 2 - SWidth / 2, (h - SHeight) / 2 - SHeight,
                   SWidth, SHeight);
        break;
      case 24:
        g.drawString("基点－右上", 0, 0, Graphics.LEFT | Graphics.TOP);
        g.setColor(0x00ff00);
        g.drawRect( (w - SWidth) / 2 - SWidth, (h - SHeight) / 2, SWidth,
                   SHeight);
        break;
      case 72:
        g.drawString("基点－右基线", 0, 0, Graphics.LEFT | Graphics.TOP);
        g.setColor(0x00ff00);
        g.drawRect( (w - SWidth) / 2 - SWidth,
                   (h - SHeight) / 2 - font.getBaselinePosition(), SWidth,
                   SHeight);
        break;
      case 40:
        g.drawString("基点－右下", 0, 0, Graphics.LEFT | Graphics.TOP);
        g.setColor(0x00ff00);
        g.drawRect( (w - SWidth) / 2 - SWidth, (h - SHeight) / 2 - SHeight,
                   SWidth, SHeight);
        break;
    }
    //绘制基点坐标点
    g.setColor(0xff0000);
    g.fillArc( (w - SWidth) / 2 - 2, (h - SHeight) / 2 - 2, 4, 4, 0, 360);
  }
}