Initial commit.

1 files changed, 152 insertions, 0 deletions

diff --git a/ui.c b/ui.c
new file mode 100644
index 0000000..a7d1070
--- /dev/null
+++ b/ui.c
@@ -0,0 +1,152 @@
+#include "config.h"
+#include "render.h"
+#include "plat.h"
+#include "rcache.h"
+#include "ui.h"
+
+Rectangle rectcut_left(Rectangle* l, int a) {
+	Rectangle r;
+	r.x = l->x;
+	r.y = l->y;
+	r.w = a;
+	r.h = l->h;
+	l->x += a;
+	l->w -= a;
+	return r;
+}
+
+Rectangle rectcut_right(Rectangle* l, int a) {
+	Rectangle r;
+	r.x = l->x + l->w - a;
+	r.y = l->y;
+	r.w = a;
+	r.h = l->h;
+	l->w -= a;
+	return r;
+}
+
+Rectangle rectcut_top(Rectangle* l, int a) {
+	Rectangle r;
+	r.x = l->x;
+	r.y = l->y;
+	r.w = l->w;
+	r.h = a;
+	l->y += a;
+	l->h -= a;
+	return r;
+}
+
+Rectangle rectcut_bottom(Rectangle* l, int a) {
+	Rectangle r;
+	r.x = l->x;
+	r.y = l->y + l->h - a;
+	r.w = l->w;
+	r.h = a;
+	l->h -= a;
+	return r;
+}
+
+Rectangle shrink_rect(const Rectangle* l, int a) {
+	Rectangle r;
+	int a2 = a * 2;
+	r.x = l->x + a;
+	r.y = l->y + a;
+	r.w = l->w - a2;
+	r.h = l->h - a2;
+	return r;
+}
+
+Rectangle centre_rect(
+	const Rectangle* l,
+	const Rectangle* t
+) {
+	Rectangle r;
+	r.x = l->x + l->w / 2 - t->w / 2;
+	r.y = l->y + l->h / 2 - t->h / 2;
+	r.w = t->w;
+	r.h = t->h;
+	return r;
+}
+
+void init_ui(UI* u, Font* f) {
+	u->font = f;
+}
+
+void ui_begin(UI* u, Rectangle* l) {
+	(void)u;
+	l->x = 0;
+	l->y = 0;
+	l->w = get_render_w();
+	l->h = get_render_h();
+}
+
+void ui_end(UI* u) {
+	(void)u;
+}
+
+void ui_label(
+	UI* u,
+	const Rectangle* l,
+	const char* text
+) {
+	rc_add_cmd_rfont_text_col(
+		u->font,
+		l->x,
+		l->y,
+		text,
+		theme_text_colour
+	);
+}
+
+int ui_button(
+	UI* u,
+	const Rectangle* r,
+	const char* label
+) {
+	Rectangle o, t;
+	Colour c;
+	int h;
+	o = shrink_rect(r, theme_outline_width);
+	h = point_rect_overlap(
+		&o,
+		get_mouse_x(),
+		get_mouse_y()
+	);
+	if (h) {
+		if (mbtn_pressed(mbtn_left))
+			c = theme_active_colour;
+		else
+			c = theme_hovered_colour;
+	} else
+		c = theme_background_colour;
+	rc_add_cmd_rect(r, theme_outline_colour);
+	rc_add_cmd_rect(&o, c);
+	t = text_rect(u->font, label);
+	o = centre_rect(&o, &t);
+	rc_add_cmd_rfont_text_col(
+		u->font,
+		o.x,
+		o.y,
+		label,
+		theme_text_colour
+	);
+	return h && mbtn_just_released(mbtn_left);
+}
+
+void ui_container(
+	UI* u,
+	const Rectangle* l,
+	Rectangle* r,
+	const Rectangle* c
+) {
+	Rectangle o, cl;
+	(void)u;
+	rc_add_cmd_rect(l, theme_outline_colour);
+	o = shrink_rect(l, theme_outline_width);
+	rc_add_cmd_rect(&o, theme_background_colour);
+	cl = o;
+	cl.w += cl.x;
+	cl.h += cl.y;
+	rc_add_cmd_clip(&cl);
+	*r = shrink_rect(&o, theme_padding);
+}