RayLab/ui.h at main · jibstack64/RayLab · GitHub

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/* Just helper functions for relative positioning of UI elements. */

#ifndef UI_H
#define UI_H

#include "window.h"

/* Offset+relative -> `Vector2`. */
static Vector2 ui_rel(Window window, Vector4 rel) {
    return (Vector2) {
        .x = rel.x + rel.y * window.length,
        .y = rel.z + rel.w * window.length
    };
}

/* Offset+relative positioning and scaling as `Rectangle`. */
static Rectangle ui_rect(Window window, Vector4 rel_pos, Vector4 rel_scale, bool center) {
    Vector2 pos = ui_rel(window, rel_pos);
    Vector2 scale = ui_rel(window, rel_scale);
    return (Rectangle) {
        .x = center
            ? pos.x - scale.x / 2
            : pos.x,
        .y = center
            ? pos.y - scale.y / 2
            : pos.y,
        .width = scale.x,
        .height = scale.y
    };
}

/* Scaling for text. */
typedef struct UIText {
    const char  *text;
    Font        font;
    Vector2     position,
                origin;
    int         scale,
                spacing;
} UIText;
static UIText ui_text(Window window, Font font, const char *text, int spacing,
        Vector4 rel_pos, Vector4 rel_scale) {
    Vector2 pos = ui_rel(window, rel_pos);
    Vector2 scale = ui_rel(window, rel_scale);

    // Boom bam bosh
    UIText template = {
        .text = text,
        .font = font,
        .position = pos,
        .origin = (Vector2) { scale.x / 2, scale.y / 2 },
        .scale = 1,
        .spacing = spacing
    };

    // Adjust scale to fit
    while (MeasureTextEx(font, text, template.scale, spacing).x < scale.x)
        template.scale += 1;

    return template;
}

#endif