TinkersConstruct/mods/tinker/tconstruct/client/CustomFont.java

package mods.tinker.tconstruct.client;

import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.InputStream;

import net.minecraft.client.Minecraft;
import net.minecraft.client.gui.Gui;
import net.minecraft.client.renderer.Tessellator;

import org.lwjgl.opengl.GL11;

/**
 * 
 * @author TheObliterator
 *
 * A class to create and draw true type
 * fonts onto the Minecraft game engine.
 */
public class CustomFont
{
	private int texID;
	private int[] xPos;
	private int[] yPos;
	private int startChar;
	private int endChar;
	private FontMetrics metrics;

	/**
	 * Instantiates the font, filling in default start
	 * and end character parameters.
	 * 
	 * 'new CustomFont(ModLoader.getMinecraftInstance(),
	 *                              "Arial", 12);
	 * 
	 * @param mc The Minecraft instance for the font to be bound to.
	 * @param fontName The name of the font to be drawn.
	 * @param size The size of the font to be drawn.
	 */
	public CustomFont(Minecraft mc, Object font, int size)
	{
		this(mc, font, size, 0, 4000);
	}

	/**
	 * Instantiates the font, pre-rendering a sprite
	 * font image by using a true type font on a
	 * bitmap. Then allocating that bitmap to the
	 * Minecraft rendering engine for later use.
	 * 
	 * 'new CustomFont(ModLoader.getMinecraftInstance(),
	 *                              "Arial", 12, 32, 126);'
	 * 
	 * @param mc The Minecraft instance for the font to be bound to.
	 * @param fontName The name of the font to be drawn.
	 * @param size The size of the font to be drawn.
	 * @param startChar The starting ASCII character id to be drawable. (Default 32)
	 * @param endChar The ending ASCII character id to be drawable. (Default 126)
	 */
	public CustomFont(Minecraft mc, Object font, int size, int startChar, int endChar)
	{
		this.startChar = startChar;
		this.endChar = endChar;
		xPos = new int[endChar - startChar];
		yPos = new int[endChar - startChar];

		// Create a bitmap and fill it with a transparent color as well
		// as obtain a Graphics instance which can be drawn on.
		// NOTE: It is CRUICIAL that the size of the image is 256x256, if
		// it is not the Minecraft engine will not draw it properly.
		BufferedImage img = new BufferedImage(256, 256, BufferedImage.TYPE_INT_ARGB);
		Graphics g = img.getGraphics();
		try
		{
			if (font instanceof String)
			{
				String fontName = (String) font;
				if (fontName.contains("/"))
					g.setFont(Font.createFont(Font.TRUETYPE_FONT, new File(fontName)).deriveFont((float) size));
				else
					g.setFont(new Font(fontName, 0, size));
			}
			else if (font instanceof InputStream)
			{
				g.setFont(Font.createFont(Font.TRUETYPE_FONT, (InputStream) font).deriveFont((float) size));
			}
			else if (font instanceof File)
			{
				g.setFont(Font.createFont(Font.TRUETYPE_FONT, (File) font).deriveFont((float) size));
			}
		}
		catch (Exception e)
		{
			e.printStackTrace();
		}

		g.setColor(new Color(255, 255, 255, 0));
		g.fillRect(0, 0, 256, 256);
		g.setColor(Color.white);
		metrics = g.getFontMetrics();

		// Draw the specified range of characters onto
		// the new bitmap, spacing according to the font
		// widths. Also allocating positions of characters
		// on the bitmap to two arrays which will be used
		// later when drawing.
		int x = 2;
		int y = 2;
		for (int i = startChar; i < endChar; i++)
		{
			g.drawString("" + ((char) i), x, y + g.getFontMetrics().getAscent());
			xPos[i - startChar] = x;
			yPos[i - startChar] = y - metrics.getMaxDescent();
			x += metrics.stringWidth("" + (char) i) + 2;
			if (x >= 250 - metrics.getMaxAdvance())
			{
				x = 2;
				y += metrics.getMaxAscent() + metrics.getMaxDescent() + size / 2;
			}
		}

		// Render the finished bitmap into the Minecraft
		// graphics engine.
		texID = mc.renderEngine.allocateAndSetupTexture(img);
	}

	/**
	 * Draws a given string with an automatically
	 * calculated shadow below it.
	 * @param gui The gui/subclass to be drawn on
	 * @param text The string to be drawn
	 * @param x The x position to start drawing
	 * @param y The y position to start drawing
	 * @param color The color of the non-shadowed text (Hex)
	 */
	public void drawStringS (Gui gui, String text, int x, int y, int color)
	{
		int l = color & 0xff000000;
		int shade = (color & 0xfcfcfc) >> 2;
		shade += l;
		drawString(gui, text, x + 1, y + 1, shade);
		drawString(gui, text, x, y, color);
	}

	/**
	 * Draws a given string onto a gui/subclass.
	 * @param gui The gui/subclass to be drawn on
	 * @param text The string to be drawn
	 * @param x The x position to start drawing
	 * @param y The y position to start drawing
	 * @param color The color of the non-shadowed text (Hex)
	 */
	public void drawString (Gui gui, String text, int x, int y, int color)
	{
		GL11.glColor4f(1.0F, 1.0F, 1.0F, 1.0F);
		GL11.glEnable(3553 /*GL_TEXTURE_2D*/);
		GL11.glBindTexture(3553 /*GL_TEXTURE_2D*/, texID);
		float red = (float) (color >> 16 & 0xff) / 255F;
		float green = (float) (color >> 8 & 0xff) / 255F;
		float blue = (float) (color & 0xff) / 255F;
		float alpha = (float) (color >> 24 & 0xff) / 255F;
		GL11.glColor4f(red, green, blue, alpha);
		int startX = x;
		for (int i = 0; i < text.length(); i++)
		{
			char c = text.charAt(i);
			if (c == '\\')
			{
				char type = text.charAt(i + 1);
				if (type == 'n')
				{
					y += metrics.getAscent() + 2;
					x = startX;
				}
				i++;
				continue;
			}
			drawChar(gui, c, x, y);
			x += metrics.getStringBounds("" + c, null).getWidth();
		}
	}

	/**
	 * Returns the created FontMetrics
	 * which is used to retrive various
	 * information about the True Type Font
	 * @return FontMetrics of the created font.
	 */
	public FontMetrics getMetrics ()
	{
		return metrics;
	}

	/**
	 * Gets the drawing width of a given
	 * string of string.
	 * @param text The string to be measured
	 * @return The width of the given string.
	 */
	public int getStringWidth (String text)
	{
		return (int) getBounds(text).getWidth();
	}

	/**
	 * Gets the drawing height of a given
	 * string of string.
	 * @param text The string to be measured
	 * @return The height of the given string.
	 */
	public int getStringHeight (String text)
	{
		return (int) getBounds(text).getHeight();
	}

	/**
	 * A method that returns a Rectangle that
	 * contains the width and height demensions
	 * of the given string.
	 * @param text The string to be measured
	 * @return Rectangle containing width and height that
	 * the text will consume when drawn.
	 */
	private Rectangle getBounds (String text)
	{
		int w = 0;
		int h = 0;
		int tw = 0;
		for (int i = 0; i < text.length(); i++)
		{
			char c = text.charAt(i);
			if (c == '\\')
			{
				char type = text.charAt(i + 1);

				if (type == 'n')
				{
					h += metrics.getAscent() + 2;
					if (tw > w)
						w = tw;
					tw = 0;
				}
				i++;
				continue;
			}
			tw += metrics.stringWidth("" + c);
		}
		if (tw > w)
			w = tw;
		h += metrics.getAscent();
		return new Rectangle(0, 0, w, h);
	}

	/**
	 * Private drawing method used within other
	 * drawing methods.
	 */
	private void drawChar (Gui gui, char c, int x, int y)
	{
		Rectangle2D bounds = metrics.getStringBounds("" + c, null);
		drawTexturedModalRect(x, y, xPos[(byte) c - startChar], yPos[(byte) c - startChar], (int) bounds.getWidth(), (int) bounds.getHeight() + metrics.getMaxDescent());
	}

    public void drawTexturedModalRect(int x, int y, int u, int v, int width, int height)
    {
        float offsetWidth = 0.00390625F;
        float offsetHeight = 0.00390625F;
        Tessellator tessellator = Tessellator.instance;
        tessellator.startDrawingQuads();
        tessellator.addVertexWithUV((x + 0), (y + height), 0, ((u + 0) * offsetWidth), ((v + height) * offsetHeight));
        tessellator.addVertexWithUV((x + width), (y + height), 0, ((u + width) * offsetWidth), ((v + height) * offsetHeight));
        tessellator.addVertexWithUV((x + width), (y + 0), 0, ((u + width) * offsetWidth), ((v + 0) * offsetHeight));
        tessellator.addVertexWithUV((x + 0), (y + 0), 0, ((u + 0) * offsetWidth), ((v + 0) * offsetHeight));
        tessellator.draw();
    }
}