I've just added a gui to the game, which is drawn on the screen (RenderGameOverlayEvent). Now there's the problem:

If you resize the game window, the gui is always drawn relative to the upper left corner. But I want to draw it on s specific position (In my case, it should be near the health bar). Is there a possibility to get the current position of the health bar?

You want to get the X position relative to the centre of the screen, and the Y position relative to the bottom. That way it doesn't mess up when you resize the window. You can do this using event.resolution.getScaledHeight() and event.resolution.getScaledWidth().

 

The Y position of the top-left corner of the health bar region is 91 pixels to the left of the centre of the screen, the X position is around 40 pixels up from the bottom.

Doesn't work...

Can you give an example?

Can you show some code first? :L

Here's my gui class.

 

package XX.XXX.XXX;


import java.util.Collection;
import java.util.Iterator;

import net.minecraft.client.Minecraft;
import net.minecraft.client.gui.Gui;
import net.minecraft.client.shader.ShaderGroup;
import net.minecraft.potion.Potion;
import net.minecraft.potion.PotionEffect;
import net.minecraft.util.ResourceLocation;
import net.minecraftforge.client.event.RenderGameOverlayEvent;
import net.minecraftforge.client.event.RenderGameOverlayEvent.ElementType;

import org.lwjgl.opengl.GL11;

import cpw.mods.fml.common.eventhandler.EventPriority;
import cpw.mods.fml.common.eventhandler.SubscribeEvent;

public class GuiTest extends Gui
{
  private Minecraft mc;

  public GuiMana(Minecraft mc)
  {
    super();
    
    this.mc = mc;
  }

  @SubscribeEvent(priority = EventPriority.NORMAL)
  public void renderGameOverlayEvent(RenderGameOverlayEvent event)
  {

    if(event.isCancelable() || event.type != ElementType.EXPERIENCE)
    {      
      return;
    }

      GL11.glColor4f(1.0F, 1.0F, 1.0F, 1.0F);
      GL11.glDisable(GL11.GL_LIGHTING);      
      this.mc.renderEngine.bindTexture(new ResourceLocation("XXX:textures/gui/ingame_gui.png"));
      /*
       *Here is the problem; What must be insert to draw the gui over the health bar?
       *
      this.drawTexturedModalRect(/*xpos*/, /*ypos*/, 0, 49, 102, 14); 

  }
}

The fields I posted in my first reply return integer values for the bottom and right edges.