Gui.java

package net.minecraft.client.gui;

import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;
import net.minecraft.client.renderer.Tessellator;
import net.minecraft.util.Icon;
import org.lwjgl.opengl.GL11;

@SideOnly(Side.CLIENT)
public class Gui
{
    protected float zLevel = 0.0F;

    protected void drawHorizontalLine(int par1, int par2, int par3, int par4)
    {
        if (par2 < par1)
        {
            int i1 = par1;
            par1 = par2;
            par2 = i1;
        }

        drawRect(par1, par3, par2 + 1, par3 + 1, par4);
    }

    protected void drawVerticalLine(int par1, int par2, int par3, int par4)
    {
        if (par3 < par2)
        {
            int i1 = par2;
            par2 = par3;
            par3 = i1;
        }

        drawRect(par1, par2 + 1, par1 + 1, par3, par4);
    }

    /**
     * Draws a solid color rectangle with the specified coordinates and color. Args: x1, y1, x2, y2, color
     */
    public static void drawRect(int par0, int par1, int par2, int par3, int par4)
    {
        int j1;

        if (par0 < par2)
        {
            j1 = par0;
            par0 = par2;
            par2 = j1;
        }

        if (par1 < par3)
        {
            j1 = par1;
            par1 = par3;
            par3 = j1;
        }

        float f = (float)(par4 >> 24 & 255) / 255.0F;
        float f1 = (float)(par4 >> 16 & 255) / 255.0F;
        float f2 = (float)(par4 >> 8 & 255) / 255.0F;
        float f3 = (float)(par4 & 255) / 255.0F;
        Tessellator tessellator = Tessellator.instance;
        GL11.glEnable(GL11.GL_BLEND);
        GL11.glDisable(GL11.GL_TEXTURE_2D);
        GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
        GL11.glColor4f(f1, f2, f3, f);
        tessellator.startDrawingQuads();
        tessellator.addVertex((double)par0, (double)par3, 0.0D);
        tessellator.addVertex((double)par2, (double)par3, 0.0D);
        tessellator.addVertex((double)par2, (double)par1, 0.0D);
        tessellator.addVertex((double)par0, (double)par1, 0.0D);
        tessellator.draw();
        GL11.glEnable(GL11.GL_TEXTURE_2D);
        GL11.glDisable(GL11.GL_BLEND);
    }

    /**
     * Draws a rectangle with a vertical gradient between the specified colors.
     */
    protected void drawGradientRect(int par1, int par2, int par3, int par4, int par5, int par6)
    {
        float f = (float)(par5 >> 24 & 255) / 255.0F;
        float f1 = (float)(par5 >> 16 & 255) / 255.0F;
        float f2 = (float)(par5 >> 8 & 255) / 255.0F;
        float f3 = (float)(par5 & 255) / 255.0F;
        float f4 = (float)(par6 >> 24 & 255) / 255.0F;
        float f5 = (float)(par6 >> 16 & 255) / 255.0F;
        float f6 = (float)(par6 >> 8 & 255) / 255.0F;
        float f7 = (float)(par6 & 255) / 255.0F;
        GL11.glDisable(GL11.GL_TEXTURE_2D);
        GL11.glEnable(GL11.GL_BLEND);
        GL11.glDisable(GL11.GL_ALPHA_TEST);
        GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
        GL11.glShadeModel(GL11.GL_SMOOTH);
        Tessellator tessellator = Tessellator.instance;
        tessellator.startDrawingQuads();
        tessellator.setColorRGBA_F(f1, f2, f3, f);
        tessellator.addVertex((double)par3, (double)par2, (double)this.zLevel);
        tessellator.addVertex((double)par1, (double)par2, (double)this.zLevel);
        tessellator.setColorRGBA_F(f5, f6, f7, f4);
        tessellator.addVertex((double)par1, (double)par4, (double)this.zLevel);
        tessellator.addVertex((double)par3, (double)par4, (double)this.zLevel);
        tessellator.draw();
        GL11.glShadeModel(GL11.GL_FLAT);
        GL11.glDisable(GL11.GL_BLEND);
        GL11.glEnable(GL11.GL_ALPHA_TEST);
        GL11.glEnable(GL11.GL_TEXTURE_2D);
    }

    /**
     * Renders the specified text to the screen, center-aligned.
     */
    public void drawCenteredString(FontRenderer par1FontRenderer, String par2Str, int par3, int par4, int par5)
    {
        par1FontRenderer.drawStringWithShadow(par2Str, par3 - par1FontRenderer.getStringWidth(par2Str) / 2, par4, par5);
    }

    /**
     * Renders the specified text to the screen.
     */
    public void drawString(FontRenderer par1FontRenderer, String par2Str, int par3, int par4, int par5)
    {
        par1FontRenderer.drawStringWithShadow(par2Str, par3, par4, par5);
    }

    /**
     * Draws a textured rectangle at the stored z-value. Args: x, y, u, v, width, height
     */
    public void drawTexturedModalRect(int par1, int par2, int par3, int par4, int par5, int par6)
    {
        float f = 0.00390625F;
        float f1 = 0.00390625F;
        Tessellator tessellator = Tessellator.instance;
        tessellator.startDrawingQuads();
        tessellator.addVertexWithUV((double)(par1 + 0), (double)(par2 + par6), (double)this.zLevel, (double)((float)(par3 + 0) * f), (double)((float)(par4 + par6) * f1));
        tessellator.addVertexWithUV((double)(par1 + par5), (double)(par2 + par6), (double)this.zLevel, (double)((float)(par3 + par5) * f), (double)((float)(par4 + par6) * f1));
        tessellator.addVertexWithUV((double)(par1 + par5), (double)(par2 + 0), (double)this.zLevel, (double)((float)(par3 + par5) * f), (double)((float)(par4 + 0) * f1));
        tessellator.addVertexWithUV((double)(par1 + 0), (double)(par2 + 0), (double)this.zLevel, (double)((float)(par3 + 0) * f), (double)((float)(par4 + 0) * f1));
        tessellator.draw();
    }

    public void drawTexturedModelRectFromIcon(int par1, int par2, Icon par3Icon, int par4, int par5)
    {
        Tessellator tessellator = Tessellator.instance;
        tessellator.startDrawingQuads();
        tessellator.addVertexWithUV((double)(par1 + 0), (double)(par2 + par5), (double)this.zLevel, (double)par3Icon.getMinU(), (double)par3Icon.getMaxV());
        tessellator.addVertexWithUV((double)(par1 + par4), (double)(par2 + par5), (double)this.zLevel, (double)par3Icon.getMaxU(), (double)par3Icon.getMaxV());
        tessellator.addVertexWithUV((double)(par1 + par4), (double)(par2 + 0), (double)this.zLevel, (double)par3Icon.getMaxU(), (double)par3Icon.getMinV());
        tessellator.addVertexWithUV((double)(par1 + 0), (double)(par2 + 0), (double)this.zLevel, (double)par3Icon.getMinU(), (double)par3Icon.getMinV());
        tessellator.draw();
    }
}