package org.newdawn.slick;
import java.io.UnsupportedEncodingException;
import org.newdawn.slick.util.Log;
/**
* A font implementation that will use the graphics inside a SpriteSheet for its data.
* This is useful when your font has a fixed width and height for each character as
* opposed to the more complex AngelCodeFont that allows different sizes and kerning
* for each character.
*
* @author Onno Scheffers
*/
public class SpriteSheetFont implements Font {
/** The SpriteSheet containing the bitmap font */
private SpriteSheet font;
/** First character in the SpriteSheet */
private char startingCharacter;
/** Width of each character in pixels */
private int charWidth;
/** Height of each character in pixels */
private int charHeight;
/** Number of characters in SpriteSheet horizontally */
private int horizontalCount;
/** Total number of characters in SpriteSheet */
private int numChars;
/**
* Create a new font based on a SpriteSheet. The SpriteSheet should hold your
* fixed-width character set in ASCII order. To only get upper-case characters
* working you would usually set up a SpriteSheet with characters for these values:
*
* !"#$%&'()*+,-./
* 0123456789:;<=>?
* @ABCDEFGHIJKLMNO
* PQRSTUVWXYZ[\]^_
* In this set, ' ' (SPACE) would be the startingCharacter of your characterSet.
*
* @param font The SpriteSheet holding the font data.
* @param startingCharacter The first character that is defined in the SpriteSheet.
*/
public SpriteSheetFont(SpriteSheet font, char startingCharacter) {
this.font = font;
this.startingCharacter = startingCharacter;
horizontalCount = font.getHorizontalCount();
int verticalCount = font.getVerticalCount();
charWidth = font.getWidth() / horizontalCount;
charHeight = font.getHeight() / verticalCount;
numChars = horizontalCount * verticalCount;
}
/**
* @see org.newdawn.slick.Font#drawString(float, float, java.lang.String)
*/
public void drawString(float x, float y, String text) {
drawString(x, y, text, Color.white);
}
/**
* @see org.newdawn.slick.Font#drawString(float, float, java.lang.String, org.newdawn.slick.Color)
*/
public void drawString(float x, float y, String text, Color col) {
drawString(x,y,text,col,0,text.length()-1);
}
/**
* @see Font#drawString(float, float, String, Color, int, int)
*/
public void drawString(float x, float y, String text, Color col, int startIndex, int endIndex) {
try {
byte[] data = text.getBytes("US-ASCII");
for (int i = 0; i < data.length; i++) {
int index = data[i] - startingCharacter;
if (index < numChars) {
int xPos = (index % horizontalCount);
int yPos = (index / horizontalCount);
if ((i >= startIndex) && (i <= endIndex)) {
font.getSprite(xPos, yPos)
.draw(x + (i * charWidth), y, col);
}
}
}
} catch (UnsupportedEncodingException e) {
// Should never happen, ASCII is supported pretty much anywhere
Log.error(e);
}
}
/**
* @see org.newdawn.slick.Font#getHeight(java.lang.String)
*/
public int getHeight(String text) {
return charHeight;
}
/**
* @see org.newdawn.slick.Font#getWidth(java.lang.String)
*/
public int getWidth(String text) {
return charWidth * text.length();
}
/**
* @see org.newdawn.slick.Font#getLineHeight()
*/
public int getLineHeight() {
return charHeight;
}
}
