How to draw a string on title screen?

[legoraft]

I'm currently trying to draw a string on the minecraft title screen, just like the copyright text, but I get alot of errors when trying to run my code.

Code (This is a mixin at the TitleScreen.class):

@Inject(at = @At("RETURN"), method = "render")
    private void titleText(CallbackInfo ci, MatrixStack matrices, String string) {
        drawStringWithShadow(matrices, this.textRenderer, "Some text", 2, this.height - 10, 16777215);
    }

[warjort]

but I get alot of errors

The old "it does not work" report.
You don't think actually posting those errors, or the full mixin class, or the mixin config would be useful?

Anyway, here's some working code with comments.

package net.fabricmc.example.mixin;

import org.spongepowered.asm.mixin.Final;
import org.spongepowered.asm.mixin.Mixin;
import org.spongepowered.asm.mixin.Shadow;
import org.spongepowered.asm.mixin.injection.At;
import org.spongepowered.asm.mixin.injection.Inject;
import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;

import net.minecraft.client.gui.DrawableHelper;
import net.minecraft.client.gui.screen.Screen;
import net.minecraft.client.gui.screen.TitleScreen;
import net.minecraft.client.util.math.MatrixStack;
import net.minecraft.util.Util;
import net.minecraft.util.math.MathHelper;

@Mixin(TitleScreen.class)
public abstract class ExampleMixin extends Screen { // we want visibility on the screen fields (the parent of TitleScreen)

    // Private fields in TitleScreen we want visibility on
    @Shadow
    @Final
    private boolean doBackgroundFade;

    @Shadow
    @Final
    private long backgroundFadeStart;

    public ExampleMixin() {
        super(null);
        throw new AssertionError("Not actually used: just to make it compile");
    }

    // Method signature must match injected method with callback on the end
    // and always try to give your mixin methods a name that helps to identity your mod in stacktraces

    @Inject(at = @At("TAIL"), method = "render")
    private void exampleMod_after_render(MatrixStack matrices, int mouseX, int mouseY, float delta, CallbackInfo info) {

        String message = "This line is printed by an example mod mixin!";

        // This could use fields initialised "once" in an injection of the init() method instead of every render tick
        int textWidth = this.textRenderer.getWidth(message);
        int textX = this.width - textWidth - 2;

        // Do the fade like the copyright
        float f = this.doBackgroundFade ? (Util.getMeasuringTimeMs() - this.backgroundFadeStart) / 1000.0F : 1.0F;
        float g = this.doBackgroundFade ? MathHelper.clamp(f - 1.0F, 0.0F, 1.0F) : 1.0F;
        int l = MathHelper.ceil(g * 255.0F) << 24;

        // The actual text (same as copyright but at height-20, i.e. just above it)
        DrawableHelper.drawStringWithShadow(matrices, this.textRenderer, message, textX, this.height - 20, 16777215 | l);
    }
}

NOTE: This mixin should be configured in the "client" part of the mixin config, unless you want crashes on dedicated servers.

[legoraft]

Awh thanks! Sorry, I forgot to give the error in the report, but I think I was just missing the DrawableHelper.