Circle.java

package exonihility.client.gui.hud;

import com.mojang.blaze3d.systems.RenderSystem;
import net.fabricmc.fabric.api.client.rendering.v1.HudRenderCallback;
import net.minecraft.client.gui.DrawContext;
import net.minecraft.client.render.*;
import org.joml.Matrix4f;

public class Circle implements HudRenderCallback {
    @Override
    public void onHudRender(DrawContext drawContext, RenderTickCounter tickDelta) {
        // Example: Draw a red circle at (100, 100) with radius 50
        drawCircle(drawContext, 100, 100, 50, 1.0f, 0.0f, 0.0f, 1.0f);
    }

    public void drawCircle(DrawContext context, int x, int y, int radius, float r, float g, float b, float a) {
        RenderSystem.setShaderColor(r, g, b, a);
        RenderSystem.enableBlend();
        RenderSystem.defaultBlendFunc();

        Matrix4f matrix = context.getMatrices().peek().getPositionMatrix();
        BufferBuilder bufferBuilder = Tessellator.getInstance().begin(VertexFormat.DrawMode.TRIANGLE_FAN, VertexFormats.POSITION_COLOR);
        bufferBuilder.vertex(x, y, 0).color(r, g, b, a);

        int segments = 100;
        for (int i = 0; i <= segments; i++) {
            float angle = 2 * (float) Math.PI * ((float) i / segments);
            float cx = (float) Math.cos(-angle) * radius;
            float cy = (float) Math.sin(-angle) * radius;

            bufferBuilder.vertex(matrix, x + cx, y + cy, 0).color(r, g, b, a);
        }

        BuiltBuffer builtBuffer = bufferBuilder.end();
        BufferRenderer.drawWithGlobalProgram(builtBuffer);
        RenderSystem.disableBlend();
    }
}