2 // Copyright (C) 2006 Matthias Braun <matze@braunis.de>
4 // This program is free software: you can redistribute it and/or modify
5 // it under the terms of the GNU General Public License as published by
6 // the Free Software Foundation, either version 3 of the License, or
7 // (at your option) any later version.
9 // This program is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 // GNU General Public License for more details.
14 // You should have received a copy of the GNU General Public License
15 // along with this program. If not, see <http://www.gnu.org/licenses/>.
17 #include "object/background.hpp"
18 #include "supertux/main.hpp"
19 #include "supertux/object_factory.hpp"
20 #include "util/reader.hpp"
22 Background::Background()
23 : layer(LAYER_BACKGROUND0)
27 Background::Background(const Reader& reader)
28 : layer(LAYER_BACKGROUND0)
30 // read position, defaults to (0,0)
35 this->pos = Vector(px,py);
40 reader.get("layer", layer);
41 if(!reader.get("image", imagefile) || !reader.get("speed", speed))
42 throw std::runtime_error("Must specify image and speed for background");
44 set_image(imagefile, speed);
45 reader.get("speed-y", speed_y);
46 if (reader.get("image-top", imagefile_top)) {
47 image_top.reset(new Surface(imagefile_top));
49 if (reader.get("image-bottom", imagefile_bottom)) {
50 image_bottom.reset(new Surface(imagefile_bottom));
54 Background::~Background()
59 Background::update(float)
64 Background::set_image(const std::string& name, float speed)
66 this->imagefile = name;
69 image.reset(new Surface(name));
73 Background::draw(DrawingContext& context)
75 if(image.get() == NULL)
78 int w = (int) image->get_width();
79 int h = (int) image->get_height();
80 int sx = int(pos.x-context.get_translation().x * speed) % w - w;
81 int sy = int(pos.y-context.get_translation().y * speed_y) % h - h;
82 int center_image_py = int(pos.y-context.get_translation().y * speed_y);
83 int bottom_image_py = int(pos.y-context.get_translation().y * speed_y) + h;
84 context.push_transform();
85 context.set_translation(Vector(0, 0));
86 for(int x = sx; x < SCREEN_WIDTH; x += w) {
87 for(int y = sy; y < SCREEN_HEIGHT; y += h) {
88 if (image_top.get() != NULL && (y < center_image_py)) {
89 context.draw_surface(image_top.get(), Vector(x, y), layer);
92 if (image_bottom.get() != NULL && (y >= bottom_image_py)) {
93 context.draw_surface(image_bottom.get(), Vector(x, y), layer);
96 context.draw_surface(image.get(), Vector(x, y), layer);
99 context.pop_transform();
102 IMPLEMENT_FACTORY(Background, "background");