So I am wondering how the hotbar works as I have an overlay, that has been made, that I want to be connected to my GUI's slot.

Here's my code for that Overlay I was talking about:

[spoiler=Gui Overlay]

public class GuiWeaponSlots extends Gui
{
private static final ResourceLocation texture = new ResourceLocation(Reference.MOD_ID + ":textures/gui/weaponSlots.png");

@SubscribeEvent(priority=EventPriority.NORMAL)
public void onRenderGameOverlay(RenderGameOverlayEvent.Post event)
{
	if (event.isCancelable() || event.type != ElementType.EXPERIENCE)
	{
		Minecraft mc = Minecraft.getMinecraft();

		ScaledResolution sr = new ScaledResolution(mc);
            int i = sr.getScaledWidth() / 2;
            ItemStack stack = mc.thePlayer.inventory.getItemStack();
            
            GlStateManager.color(1.0F, 1.0F, 1.0F, 1.0F);
            mc.getTextureManager().bindTexture(texture);
		this.drawTexturedModalRect(i - 121, sr.getScaledHeight() - 22, 0, 0, 22, 22);
		this.drawTexturedModalRect(i + 101, sr.getScaledHeight() - 22, 0, 0, 22, 22);
	}
}
}

 

 

 

[spoiler=GUI (slots)]

public class GuiWeapons extends GuiContainer
{
private float xSize_lo;
private float ySize_lo;
private static ResourceLocation slot = new ResourceLocation(Reference.MOD_ID + ":textures/gui/gui_heroesWeapons.png");

public GuiWeapons(EntityPlayer player, InventoryPlayer invPlayer, InventoryWeapons invWeapons)
{
	super(new ContainerWeapons(player, invPlayer, invWeapons));
	this.xSize = 256;
	this.ySize = 146;
}

@Override
public void drawScreen(int mouseX, int mouseY, float partialTicks)
{
	super.drawScreen(mouseX, mouseY, partialTicks);
	this.xSize_lo = mouseX;
	this.ySize_lo = mouseY;
}

@Override
protected void drawGuiContainerBackgroundLayer(float partialTicks, int mouseX, int mouseY)
{
    int i = (this.width - this.xSize) / 2;
    int j = (this.height - this.ySize) / 2;
    int x = i + this.xSize / 2;
    int y = j + this.ySize / 2 + 25;
    this.mc.getTextureManager().bindTexture(slot);
        this.drawTexturedModalRect(i, j, 0, 0, xSize, ySize);
        drawEntityOnScreen(x, y, 40, (float)(i + 51) - this.xSize_lo, (float)(j + 75 - 50) - this.ySize_lo, mc.thePlayer);
}

public static void drawEntityOnScreen(int posX, int posY, int scale, float mouseX, float mouseY, EntityLivingBase ent)
    {
        GlStateManager.enableColorMaterial();
        GlStateManager.pushMatrix();
        GlStateManager.translate((float)posX, (float)posY, 50.0F);
        GlStateManager.scale((float)(-scale), (float)scale, (float)scale);
        GlStateManager.rotate(180.0F, 0.0F, 0.0F, 1.0F);
        float f = ent.renderYawOffset;
        float f1 = ent.rotationYaw;
        float f2 = ent.rotationPitch;
        float f3 = ent.prevRotationYawHead;
        float f4 = ent.rotationYawHead;
        GlStateManager.rotate(135.0F, 0.0F, 1.0F, 0.0F);
        RenderHelper.enableStandardItemLighting();
        GlStateManager.rotate(-135.0F, 0.0F, 1.0F, 0.0F);
        GlStateManager.rotate(-((float)Math.atan((double)(mouseY / 40.0F))) * 20.0F, 1.0F, 0.0F, 0.0F);
        ent.renderYawOffset = (float)Math.atan((double)(mouseX / 40.0F)) * 20.0F;
        ent.rotationYaw = (float)Math.atan((double)(mouseX / 40.0F)) * 40.0F;
        ent.rotationPitch = -((float)Math.atan((double)(mouseY / 40.0F))) * 20.0F;
        ent.rotationYawHead = ent.rotationYaw;
        ent.prevRotationYawHead = ent.rotationYaw;
        GlStateManager.translate(0.0F, 0.0F, 0.0F);
        RenderManager rendermanager = Minecraft.getMinecraft().getRenderManager();
        rendermanager.setPlayerViewY(180.0F);
        rendermanager.setRenderShadow(false);
        rendermanager.renderEntityWithPosYaw(ent, 0.0D, 0.0D, 0.0D, 0.0F, 1.0F);
        rendermanager.setRenderShadow(true);
        ent.renderYawOffset = f;
        ent.rotationYaw = f1;
        ent.rotationPitch = f2;
        ent.prevRotationYawHead = f3;
        ent.rotationYawHead = f4;
        GlStateManager.popMatrix();
        RenderHelper.disableStandardItemLighting();
        GlStateManager.disableRescaleNormal();
        GlStateManager.setActiveTexture(OpenGlHelper.lightmapTexUnit);
        GlStateManager.disableTexture2D();
        GlStateManager.setActiveTexture(OpenGlHelper.defaultTexUnit);
    }
}

 

 

 

Thanks in advance.

Since the players inventory is synced between client and server the client has the most updated data most of the time. It accesses the players inventory and displays the ItemStacks from that.

Since the players inventory is synced between client and server the client has the most updated data most of the time. It accesses the players inventory and displays the ItemStacks from that.

 

I see, but how do will my overlay know what item is in the gui slot so as to render my item in either slot 1 or slot 2?

The overlay needs to have access to the itemstacks, from the inventory not the gui.

The overlay needs to have access to the itemstacks, from the inventory not the gui.

 

IInventory#getStackInSlot? What method do I call to render the Item in the slot?

Like this

Minecraft.getMinecraft().getRenderItem().renderItemAndEffectIntoGUI(getStackInSlot(), xPosition, yPosition);

Like this

Minecraft.getMinecraft().getRenderItem().renderItemAndEffectIntoGUI(getStackInSlot(), xPosition, yPosition);

For some reason, it ain't showing on the slots.

 

 

public class GuiWeaponSlots extends Gui
{
private static final ResourceLocation texture = new ResourceLocation(Reference.MOD_ID + ":textures/gui/weaponSlots.png");

@SubscribeEvent(priority=EventPriority.NORMAL)
public void onRenderGameOverlay(RenderGameOverlayEvent.Post event)
{
	if (event.isCancelable() || event.type != ElementType.EXPERIENCE)
	{
		Minecraft mc = Minecraft.getMinecraft();
		Item item = new Item();

		ScaledResolution sr = new ScaledResolution(mc);
            int i = sr.getScaledWidth() / 2;
            InventoryWeapons invWeapons = new InventoryWeapons();
            ItemStack stack1 = invWeapons.getStackInSlot(0);
            
            GlStateManager.color(1.0F, 1.0F, 1.0F, 1.0F);
            mc.getTextureManager().bindTexture(texture);
		this.drawTexturedModalRect(i - 121, sr.getScaledHeight() - 22, 0, 0, 22, 22);
		mc.getRenderItem().renderItemAndEffectIntoGUI(stack1, i - 120, sr.getScaledHeight() - 23);
		this.drawTexturedModalRect(i + 101, sr.getScaledHeight() - 22, 0, 0, 22, 22);
	}
}
}

 

 

Q: why are you creating a new Item here?

Q: why are you creating a new Item here?

 

It used to be part of the code last time. Thanks for the reminder, I'm removing it.

I'm wondering, are the ElementTypes arranged in a particular order? If so, which is the starting and what order are they arranged in?

@Cancelable
public class RenderGameOverlayEvent extends Event
{
    public static enum ElementType
    {
        ALL,
        HELMET,
        PORTAL,
        CROSSHAIRS,
        BOSSHEALTH,
        ARMOR,
        HEALTH,
        FOOD,
        AIR,
        HOTBAR,
        EXPERIENCE,
        TEXT,
        HEALTHMOUNT,
        JUMPBAR,
        CHAT,
        PLAYER_LIST,
        DEBUG
    }

I'm wondering, are the ElementTypes arranged in a particular order? If so, which is the starting and what order are they arranged in?

 

Look for usages of one in your IDE, then look for usages of the method you find. This will lead you to

GuiIngameForge#renderGameOverlay

, which calls the methods that fire

RenderGameOverlayEvent

.