FontUtils.java

package codechicken.lib.render;

import net.minecraft.client.Minecraft;
import net.minecraft.client.gui.FontRenderer;
import net.minecraft.client.renderer.GlStateManager;
import net.minecraft.item.ItemStack;

public class FontUtils {
    public static FontRenderer fontRenderer = Minecraft.getMinecraft().fontRendererObj;

    public static void drawCenteredString(String s, int xCenter, int y, int colour) {
        fontRenderer.drawString(s, xCenter - fontRenderer.getStringWidth(s) / 2, y, colour);
    }

    public static void drawRightString(String s, int xRight, int y, int colour) {
        fontRenderer.drawString(s, xRight - fontRenderer.getStringWidth(s), y, colour);
    }

    public static final String[] prefixes = new String[] { "K", "M", "G" };

    public static void drawItemQuantity(int x, int y, ItemStack item, String quantity, int mode) {
        if (item == null || (quantity == null && item.stackSize <= 1)) {
            return;
        }

        if (quantity == null) {
            switch (mode) {
            case 2:
                int q = item.stackSize;
                String postfix = "";
                for (int p = 0; p < 3 && q > 1000; p++) {
                    q /= 1000;
                    postfix = prefixes[p];
                }
                quantity = Integer.toString(q) + postfix;
                break;
            case 1:
                quantity = "";
                if (item.stackSize / 64 > 0) {
                    quantity += item.stackSize / 64 + "s";
                }
                if (item.stackSize % 64 > 0) {
                    quantity += item.stackSize % 64;
                }
                break;
            default:
                quantity = Integer.toString(item.stackSize);
                break;
            }
        }

        double scale = quantity.length() > 2 ? 0.5 : 1;
        double sheight = 8 * scale;
        double swidth = fontRenderer.getStringWidth(quantity) * scale;

        GlStateManager.disableLighting();
        GlStateManager.disableDepth();
        GlStateManager.pushMatrix();
        GlStateManager.translate(x + 16 - swidth, y + 16 - sheight, 0);
        GlStateManager.scale(scale, scale, 1);
        fontRenderer.drawStringWithShadow(quantity, 0, 0, 0xFFFFFF);
        GlStateManager.popMatrix();
        GlStateManager.enableLighting();
        GlStateManager.enableDepth();
    }
}