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Graduately/unitmap.c

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#include "maturita.h"
/* ------------------------------------------------------------------ */
/* Unit 1 exercise path (roadmap-style serpentine) */
/* ------------------------------------------------------------------ */
/* Compute the serpentine exercise layout for the given available width. */
void ex_layout_geometry(UnitCtx *u, double avail) {
const int n = u->n_ex;
const double phase = 2.0 * G_PI * 1.7 / (double)(n > 1 ? n - 1 : 1);
const double lift = u->has_branch ? EX_BRANCH_LIFT : 0.0;
int rows;
int r, c, i;
if (n < 1)
return;
for (rows = 1; rows <= n; rows++) {
int cols = (n + rows - 1) / rows;
if (2.0 * EX_MX + (cols - 1) * EX_SPAC <= avail + 1.0)
break;
}
if (rows > n)
rows = n;
u->ex_rows = rows;
u->ex_cols = (n + rows - 1) / rows;
if (u->ex_cols < 1)
u->ex_cols = 1;
u->ex_cw = (int)(2.0 * EX_MX + (u->ex_cols - 1) * EX_SPAC);
u->ex_ch = (int)(2.0 * EX_MY + (rows - 1) * EX_GAP + lift);
for (r = 0; r < rows; r++) {
int base = r * u->ex_cols;
int len = MIN(u->ex_cols, n - base);
int fwd = (r % 2) == 0;
for (c = 0; c < len; c++) {
i = base + c;
int cc = fwd ? c : (u->ex_cols - 1 - c);
u->ex_cx[i] = EX_MX + cc * EX_SPAC;
u->ex_cy[i] = EX_MY + lift + r * EX_GAP
+ EX_WAVE * sin((double)i * phase);
}
}
/* The branch hangs above exercise 2 (index 1), nudged sideways so its
* connector is a slanted link rather than a dead-straight vertical line. */
if (u->has_branch && n > 1) {
u->branch_cx = u->ex_cx[1] + EX_BRANCH_DX;
u->branch_cy = u->ex_cy[1] - EX_BRANCH_LIFT;
}
}
void ex_point(UnitCtx *u, double t, double *ox, double *oy) {
const int n = u->n_ex;
int k = (int)t;
double uu = t - (double)k;
double u2, u3;
double p0x, p0y, p1x, p1y, p2x, p2y, p3x, p3y;
if (n < 2) { *ox = u->ex_cx[0]; *oy = u->ex_cy[0]; return; }
if (k < 0) { k = 0; uu = 0.0; }
if (k >= n - 1) { k = n - 2; uu = 1.0; }
p1x = u->ex_cx[k]; p1y = u->ex_cy[k];
p2x = u->ex_cx[k + 1]; p2y = u->ex_cy[k + 1];
if (k - 1 >= 0) { p0x = u->ex_cx[k - 1]; p0y = u->ex_cy[k - 1]; }
else { p0x = p1x - (p2x - p1x); p0y = p1y - (p2y - p1y); }
if (k + 2 < n) { p3x = u->ex_cx[k + 2]; p3y = u->ex_cy[k + 2]; }
else { p3x = p2x + (p2x - p1x); p3y = p2y + (p2y - p1y); }
u2 = uu * uu;
u3 = u2 * uu;
*ox = 0.5 * (2.0 * p1x + (-p0x + p2x) * uu
+ (2.0 * p0x - 5.0 * p1x + 4.0 * p2x - p3x) * u2
+ (-p0x + 3.0 * p1x - 3.0 * p2x + p3x) * u3);
*oy = 0.5 * (2.0 * p1y + (-p0y + p2y) * uu
+ (2.0 * p0y - 5.0 * p1y + 4.0 * p2y - p3y) * u2
+ (-p0y + 3.0 * p1y - 3.0 * p2y + p3y) * u3);
}
void ex_path(UnitCtx *u, cairo_t *cr, double t0, double t1) {
const double steps_per_unit = 48.0;
int n = (int)((t1 - t0) * steps_per_unit);
double x, y;
int s;
if (n < 1)
n = 1;
ex_point(u, t0, &x, &y);
cairo_move_to(cr, x, y);
for (s = 1; s <= n; s++) {
ex_point(u, t0 + (t1 - t0) * (double)s / (double)n, &x, &y);
cairo_line_to(cr, x, y);
}
}
/* Wavy link from an exercise bubble up to the off-path branch. */
static void branch_path(cairo_t *cr, double x0, double y0,
double x1, double y1) {
double dy = y0 - y1;
double c1x = x0 + EX_WAVE * 1.3;
double c1y = y0 - dy * 0.45;
double c2x = x1 - EX_WAVE * 1.3;
double c2y = y1 + dy * 0.45;
cairo_move_to(cr, x0, y0);
cairo_curve_to(cr, c1x, c1y, c2x, c2y, x1, y1);
}
void draw_ex_rail(GtkDrawingArea *area, cairo_t *cr,
int width, int height, gpointer user_data) {
UnitCtx *u = user_data;
const double t_end = (double)(u->n_ex - 1);
const Rgb slate = color_from_hex(app_theme.surface1);
const Rgb green = color_from_hex(app_theme.success);
const Rgb rail = color_from_hex(app_theme.rail);
(void)area;
(void)width;
(void)height;
cairo_set_operator(cr, CAIRO_OPERATOR_CLEAR);
cairo_paint(cr);
cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
cairo_set_line_cap(cr, CAIRO_LINE_CAP_ROUND);
cairo_set_line_join(cr, CAIRO_LINE_JOIN_ROUND);
cairo_new_path(cr);
ex_path(u, cr, 0.0, t_end);
cairo_set_line_width(cr, 14);
cairo_set_source_rgb(cr, rail.r, rail.g, rail.b);
cairo_stroke(cr);
cairo_new_path(cr);
ex_path(u, cr, 0.0, t_end);
cairo_set_line_width(cr, 9);
cairo_set_source_rgb(cr, slate.r, slate.g, slate.b);
cairo_stroke(cr);
for (int k = 0; k < u->n_ex - 1; k++) {
if (!(u->done[k + 1] || u->done[k + 2]))
continue;
cairo_new_path(cr);
ex_path(u, cr, (double)k, (double)(k + 1));
cairo_set_source_rgba(cr, green.r, green.g, green.b, 0.85);
cairo_set_line_width(cr, 9);
cairo_stroke(cr);
}
/* Off-path branch connector up from exercise 2. */
if (u->has_branch && u->n_ex > 1) {
gboolean bdone = u->done[u->branch_ex];
cairo_new_path(cr);
branch_path(cr, u->ex_cx[1], u->ex_cy[1], u->branch_cx, u->branch_cy);
cairo_set_line_width(cr, 14);
cairo_set_source_rgb(cr, rail.r, rail.g, rail.b);
cairo_stroke(cr);
cairo_new_path(cr);
branch_path(cr, u->ex_cx[1], u->ex_cy[1], u->branch_cx, u->branch_cy);
cairo_set_line_width(cr, 9);
if (bdone)
cairo_set_source_rgba(cr, green.r, green.g, green.b, 0.85);
else
cairo_set_source_rgb(cr, slate.r, slate.g, slate.b);
cairo_stroke(cr);
}
}
void ex_apply_layout(UnitCtx *u) {
int i;
if (!u->ex_fixed)
return;
for (i = 0; i < u->n_ex; i++) {
if (u->ex_cells[i])
gtk_fixed_move(GTK_FIXED(u->ex_fixed), u->ex_cells[i],
(int)(u->ex_cx[i] - EX_BUBBLE / 2.0),
(int)(u->ex_cy[i] - EX_BUBBLE / 2.0));
if (u->ex_labels[i])
gtk_fixed_move(GTK_FIXED(u->ex_fixed), u->ex_labels[i],
(int)(u->ex_cx[i] - (EX_SPAC - 20.0) / 2.0),
(int)(u->ex_cy[i] + EX_BUBBLE / 2.0 + 8.0));
}
if (u->has_branch && u->branch_cell) {
gtk_fixed_move(GTK_FIXED(u->ex_fixed), u->branch_cell,
(int)(u->branch_cx - EX_BUBBLE / 2.0),
(int)(u->branch_cy - EX_BUBBLE / 2.0));
if (u->branch_label)
gtk_fixed_move(GTK_FIXED(u->ex_fixed), u->branch_label,
(int)(u->branch_cx + EX_BUBBLE / 2.0 + 10.0),
(int)(u->branch_cy - 14.0));
}
gtk_widget_set_size_request(u->ex_fixed, u->ex_cw, u->ex_ch);
gtk_widget_set_size_request(u->ex_rail, u->ex_cw, u->ex_ch);
gtk_fixed_move(GTK_FIXED(u->ex_fixed), u->ex_rail, 0, 0);
gtk_widget_queue_draw(u->ex_rail);
}
void ex_relayout(UnitCtx *u) {
GtkAdjustment *hadj;
double avail;
if (!u->ex_scroll)
return;
hadj = gtk_scrolled_window_get_hadjustment(
GTK_SCROLLED_WINDOW(u->ex_scroll));
avail = gtk_adjustment_get_page_size(hadj);
if (avail < 1.0)
return;
ex_layout_geometry(u, avail);
ex_apply_layout(u);
}
gboolean ex_relayout_idle(gpointer data) {
UnitCtx *u = data;
u->ex_idle = 0;
ex_relayout(u);
return G_SOURCE_REMOVE;
}
void ex_relayout_later(UnitCtx *u) {
if (u->ex_idle == 0)
u->ex_idle = g_idle_add(ex_relayout_idle, u);
}
void ex_adjust_notify(GtkAdjustment *adj, GParamSpec *ps,
gpointer data) {
(void)adj;
(void)ps;
ex_relayout_later(data);
}
GtkWidget *make_bubble(UnitCtx *u, int n) {
GtkWidget *btn;
GtkWidget *vbox;
GtkWidget *num_label;
GtkWidget *icon;
char *num;
char *target;
btn = gtk_button_new();
gtk_widget_add_css_class(btn, "ex-bubble");
gtk_widget_set_size_request(btn, (int)EX_BUBBLE, (int)EX_BUBBLE);
gtk_widget_set_can_focus(btn, FALSE);
if (u->done[n])
gtk_widget_add_css_class(btn, "done");
vbox = gtk_box_new(GTK_ORIENTATION_VERTICAL, 2);
gtk_widget_set_halign(vbox, GTK_ALIGN_CENTER);
gtk_widget_set_valign(vbox, GTK_ALIGN_CENTER);
gtk_button_set_child(GTK_BUTTON(btn), vbox);
num = g_strdup_printf("%d", n);
num_label = gtk_label_new(num);
g_free(num);
gtk_widget_set_halign(num_label, GTK_ALIGN_CENTER);
gtk_widget_add_css_class(num_label, "bubble-number");
gtk_box_append(GTK_BOX(vbox), num_label);
icon = icon_area_new(draw_check_icon, 0.1176, 0.1176, 0.1804, 16);
gtk_widget_set_visible(icon, u->done[n]);
gtk_box_append(GTK_BOX(vbox), icon);
u->ex_cells[n - 1] = btn;
u->ex_icons[n] = icon;
target = g_strdup_printf("%se%d", u->ex_tag, n);
g_object_set_data_full(G_OBJECT(btn), "target", target, g_free);
g_signal_connect(btn, "clicked", G_CALLBACK(on_nav_clicked), NULL);
return btn;
}
static GtkWidget *make_branch_bubble(UnitCtx *u) {
GtkWidget *btn;
GtkWidget *vbox;
GtkWidget *star;
GtkWidget *icon;
btn = gtk_button_new();
gtk_widget_add_css_class(btn, "ex-bubble");
gtk_widget_add_css_class(btn, "ex-branch");
gtk_widget_set_size_request(btn, (int)EX_BUBBLE, (int)EX_BUBBLE);
gtk_widget_set_can_focus(btn, FALSE);
if (u->done[u->branch_ex])
gtk_widget_add_css_class(btn, "done");
vbox = gtk_box_new(GTK_ORIENTATION_VERTICAL, 2);
gtk_widget_set_halign(vbox, GTK_ALIGN_CENTER);
gtk_widget_set_valign(vbox, GTK_ALIGN_CENTER);
gtk_button_set_child(GTK_BUTTON(btn), vbox);
star = gtk_label_new("★");
gtk_widget_set_halign(star, GTK_ALIGN_CENTER);
gtk_widget_add_css_class(star, "bubble-number");
gtk_widget_add_css_class(star, "branch-star");
gtk_box_append(GTK_BOX(vbox), star);
icon = icon_area_new(draw_check_icon, 0.1176, 0.1176, 0.1804, 16);
gtk_widget_set_visible(icon, u->done[u->branch_ex]);
gtk_box_append(GTK_BOX(vbox), icon);
u->branch_cell = btn;
u->branch_icon = icon;
g_object_set_data_full(G_OBJECT(btn), "target",
g_strdup(u->branch_target), g_free);
g_signal_connect(btn, "clicked", G_CALLBACK(on_nav_clicked), NULL);
return btn;
}
GtkWidget *build_unit_page(UnitCtx *u) {
GtkWidget *page;
GtkWidget *scroll;
GtkWidget *wrap;
GtkWidget *fixed;
GtkWidget *rail;
GtkAdjustment *ha;
GtkAdjustment *va;
int i;
if (u->n_ex < 1)
return NULL;
ex_layout_geometry(u, 1000.0);
page = gtk_box_new(GTK_ORIENTATION_VERTICAL, 0);
gtk_widget_set_hexpand(page, TRUE);
gtk_widget_set_vexpand(page, TRUE);
gtk_widget_set_margin_start(page, 32);
gtk_widget_set_margin_end(page, 32);
gtk_widget_set_margin_top(page, 24);
gtk_widget_set_margin_bottom(page, 24);
gtk_box_append(GTK_BOX(page),
top_bar("roadmap", u->title, u->sub_key));
scroll = gtk_scrolled_window_new();
gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(scroll),
GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
gtk_widget_set_vexpand(scroll, TRUE);
gtk_widget_set_margin_top(scroll, 14);
gtk_box_append(GTK_BOX(page), scroll);
u->ex_scroll = scroll;
wrap = gtk_center_box_new();
gtk_widget_set_vexpand(wrap, TRUE);
gtk_widget_set_hexpand(wrap, TRUE);
gtk_scrolled_window_set_child(GTK_SCROLLED_WINDOW(scroll), wrap);
fixed = gtk_fixed_new();
gtk_widget_set_halign(fixed, GTK_ALIGN_CENTER);
gtk_widget_set_valign(fixed, GTK_ALIGN_CENTER);
gtk_widget_set_size_request(fixed, u->ex_cw, u->ex_ch);
gtk_center_box_set_center_widget(GTK_CENTER_BOX(wrap), fixed);
u->ex_fixed = fixed;
rail = gtk_drawing_area_new();
gtk_widget_set_size_request(rail, u->ex_cw, u->ex_ch);
gtk_drawing_area_set_draw_func(GTK_DRAWING_AREA(rail), draw_ex_rail,
u, NULL);
gtk_fixed_put(GTK_FIXED(fixed), rail, 0, 0);
u->ex_rail = rail;
for (i = 0; i < u->n_ex; i++) {
GtkWidget *btn = make_bubble(u, i + 1);
GtkWidget *lbl = gtk_label_new(u->ex_names[i + 1]);
u->ex_labels[i] = lbl;
gtk_widget_set_size_request(lbl, (int)(EX_SPAC - 20.0), -1);
gtk_widget_set_halign(lbl, GTK_ALIGN_CENTER);
gtk_label_set_justify(GTK_LABEL(lbl), GTK_JUSTIFY_CENTER);
gtk_label_set_wrap(GTK_LABEL(lbl), TRUE);
gtk_widget_add_css_class(lbl, "ex-label");
gtk_fixed_put(GTK_FIXED(fixed), btn, 0, 0);
gtk_fixed_put(GTK_FIXED(fixed), lbl, 0, 0);
}
if (u->has_branch && u->branch_target) {
GtkWidget *btn = make_branch_bubble(u);
GtkWidget *lbl = gtk_label_new(u->branch_name);
u->branch_label = lbl;
gtk_widget_set_halign(lbl, GTK_ALIGN_START);
gtk_widget_add_css_class(lbl, "ex-label");
gtk_widget_set_visible(lbl, TRUE);
gtk_fixed_put(GTK_FIXED(fixed), btn, 0, 0);
gtk_fixed_put(GTK_FIXED(fixed), lbl, 0, 0);
}
ha = gtk_scrolled_window_get_hadjustment(GTK_SCROLLED_WINDOW(scroll));
va = gtk_scrolled_window_get_vadjustment(GTK_SCROLLED_WINDOW(scroll));
g_signal_connect(ha, "notify::page-size",
G_CALLBACK(ex_adjust_notify), u);
g_signal_connect(va, "notify::page-size",
G_CALLBACK(ex_adjust_notify), u);
ex_apply_layout(u);
ex_relayout_later(u);
return page;
}
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