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* Copyright © 2012 Keith Packard <keithp@keithp.com>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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autoload Client::Draw;
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autoload Nichrome::Timer;
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extend namespace Nichrome {
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public namespace RRboard {
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public int board_width = RR::Width * Draw::cell_width;
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public int board_height = RR::Height * Draw::cell_height;
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public typedef widget_t + struct {
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RR::RobotOrNone active_robot;
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*Timer::timer_t timer;
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void (RR::Color color,
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RR::Direction direction) move_callback;
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int button_x, button_y;
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real dimension(&rrboard_widget_t widget) = min (widget.geometry.width, widget.geometry.height);
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Draw::transform_t transform(&rrboard_widget_t widget) {
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real dim = dimension(&widget);
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return (Draw::transform_t) {
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.xscale = dim / board_width,
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.yscale = dim / board_height,
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.xoff = (widget.geometry.width - dim) // 2,
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.yoff = (widget.geometry.height - dim) // 2
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void draw (cairo_t cr, &rrboard_widget_t widget) {
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Draw::transform_t t = transform(&widget);
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for (int y = 0; y < RR::Height; y++)
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for (int x = 0; x < RR::Width; x++) {
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Draw::background(cr, x, y, widget.board[x,y], &t);
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Draw::walls(cr, x, y, widget.board[x,y], &t);
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Draw::contents(cr, x, y, widget.board[x,y], widget.active_robot, &t);
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for (int y = RR::Height / 2 - 1; y < RR::Height/2 + 1; y++)
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for (int x = RR::Width / 2 - 1; x < RR::Width/2 + 1; x++) {
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Draw::background(cr, x, y, widget.board[x,y], &t);
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Draw::walls(cr, x, y, widget.board[x,y], &t);
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Draw::target(cr, RR::Width / 2 - 1, RR::Height / 2 - 1,
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RR::active_target(&widget.board), &t);
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void outline (cairo_t cr, &rrboard_widget_t widget) {
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rectangle(cr, 0, 0, widget.geometry.width, widget.geometry.height);
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void natural (cairo_t cr, &rrboard_widget_t widget) {
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rectangle(cr, 0, 0, board_width, board_height);
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/* Override default widget configure function to also reposition
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void configure (&rrboard_widget_t widget, rect_t geometry) {
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Widget::configure(&widget, geometry);
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/* Configure timer to sit over the central
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real board_dim = dimension(&widget);
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real timer_dim = board_dim * 2 / RR::Width;
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real timer_pos = board_dim / RR::Width * 7;
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widget.timer->configure (widget.timer,
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.x = geometry.x + timer_pos,
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.y = geometry.y + timer_pos,
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void set_active_robot(&rrboard_widget_t widget, RR::Robot robot) {
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widget.active_robot = (RR::RobotOrNone.robot) robot;
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Widget::redraw(&widget);
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void set_active (&rrboard_widget_t widget, string color) {
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set_active_robot(&widget, (RR::Robot) { .color = RR::color(color) });
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} catch RR::rr_error(RR::Error error) {
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void move_active (&rrboard_widget_t widget, string dir) {
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RR::Direction direction = RR::direction(dir);
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union switch (widget.active_robot) {
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widget.move_callback(r.color, direction);
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} catch RR::rr_error(RR::Error error) {
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protected void key (&rrboard_widget_t widget, &key_event_t event) {
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if (event.type != key_type_t.press)
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set_active (&widget, event.key);
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set_active (&widget, "whirl");
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case "Left": case "w": case "W":
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move_active(&widget, "west");
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case "Right": case "e": case "E":
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move_active(&widget, "east");
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case "Up": case "n": case "N":
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move_active(&widget, "north");
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case "Down": case "s": case "S":
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move_active(&widget, "south");
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typedef struct { int x, y; } position_t;
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* A bit expensive, but it's more reliable than trying to
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* keep track of robot positions separately
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position_t find_robot (&rrboard_widget_t widget, RR::Robot robot) {
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for (int y = 0; y < RR::Height; y++)
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for (int x = 0; x < RR::Width; x++) {
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union switch (widget.board[x,y].robot) {
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if (r.color == robot.color)
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return (position_t) { .x = x, .y = y };
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return (position_t) { .x = 0, .y = 0 };
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protected void button (&rrboard_widget_t widget, &button_event_t event) {
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/* Convert button position to board location */
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Draw::transform_t t = transform(&widget);
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int x = floor ((event.x - t.xoff) / t.xscale / Draw::cell_width);
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int y = floor ((event.y - t.yoff) / t.yscale / Draw::cell_height);
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enum switch (event.type) {
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RR::Object object = widget.board[x,y];
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/* Clicking on a robot selects that robot
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union switch (object.robot) {
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set_active_robot(&widget, r);
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/* Releasing with an active robot moves the robot
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* towards the point of release
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union switch (widget.active_robot) {
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position_t robot_pos = find_robot(&widget, r);
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int dx = x - robot_pos.x;
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int dy = y - robot_pos.y;
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if (abs (dx) > abs (dy)) {
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move_active(&widget, "west");
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move_active(&widget, "east");
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move_active(&widget, "north");
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move_active(&widget, "south");
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protected void set_timer (&rrboard_widget_t widget, real time) {
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Timer::set_timer(widget.timer, time);
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protected void stop_timer (&rrboard_widget_t widget) {
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Timer::stop_timer(widget.timer);
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public *rrboard_widget_t new(&nichrome_t nichrome,
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void(RR::Color color, RR::Direction dir) move_callback){
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&rrboard_widget_t widget = &(rrboard_widget_t) {};
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widget.timer = Timer::new(&nichrome); /* make sure timer is above rrboard */
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Widget::init(&nichrome, &widget);
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widget.outline = outline;
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widget.natural = natural;
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widget.configure = configure;
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widget.button = button;
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widget.active_robot = RobotOrNone.none;
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widget.move_callback = move_callback;
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widget.board = (RR::Board) { { { .robot = RobotOrNone.none,
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.target = TargetOrNone.none,
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.walls = { .left = false, .right = false,
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.above = false, .below = false }
added
removed
ricochet-0.1/nichrome-rrboard.5c
