Class Scene

examples/scenes/src/Scene.java:7–77

import io.github.humbleui.types.*;

public abstract class Scene {
    public static final Typeface inter = FontMgr.getDefault().makeFromFile(file("fonts/InterHinted-Regular.ttf"));
    public static final Typeface jbMono = FontMgr.getDefault().makeFromFile(file("fonts/JetBrainsMono-Regular.ttf"));
    public static final Font     inter13 = new Font(inter, 13).setSubpixel(true);
    public static final Paint    blackFill = new Paint().setColor(0xFF000000);

    public String[] _variants = new String[] { "Default" };
    public int _variantIdx = 0;
    
    public boolean scale() {
        return true;
    }

    public String variantTitle() {
        return _variants[_variantIdx];
    }

    public void changeVariant(int delta) {
        _variantIdx = (_variantIdx + _variants.length + delta) % _variants.length;
    }

    public abstract void draw(Canvas canvas, int width, int height, float dpi, int xpos, int ypos);

    public void onScroll(float dx, float dy) {}

    public static String file(String path) {
        return "../scenes/" + path;
    }

    public static void drawStringCentered(Canvas canvas, String text, float x, float y, Font font, Paint paint) {
        Rect bounds = font.measureText(text, paint);
        float lineHeight = font.getMetrics().getCapHeight();
        canvas.drawString(text,
            x - bounds.getRight() / 2,
            y + lineHeight / 2,
            font, paint);
    }

    public static void drawStringLeft(Canvas canvas, String text, Rect outer, Font font, Paint paint) {
        Rect inner = font.measureText(text, paint);
        FontMetrics metrics = font.getMetrics();
        float innerHeight = metrics.getDescent() - metrics.getAscent();

        canvas.drawString(text,
            outer.getLeft(), 
            outer.getTop() + (outer.getHeight() - innerHeight) / 2f - metrics.getAscent(),
            font, paint);
    }

    public static float phase() {
        var angle = (System.currentTimeMillis() % 5000) / 5000.0 * Math.PI * 2.0;
        var phase = Math.sin(angle) * 1.2;
        phase = Math.min(1.0, Math.max(-1.0, phase));
        return (float) (phase + 1) / 2f;
    }

    public static String formatFloat(float f) {
        return String.format(Locale.ENGLISH, "%.02f", f).replaceAll("\\.?0+$", "");