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/globals.hpp"
19 #include "supertux/object_factory.hpp"
20 #include "util/reader.hpp"
22 Background::Background() :
23 layer(LAYER_BACKGROUND0),
36 Background::Background(const Reader& reader) :
37 layer(LAYER_BACKGROUND0),
48 // read position, defaults to (0,0)
53 this->pos = Vector(px,py);
58 reader.get("layer", layer);
59 if(!reader.get("image", imagefile) || !reader.get("speed", speed))
60 throw std::runtime_error("Must specify image and speed for background");
62 set_image(imagefile, speed);
63 reader.get("speed-y", speed_y);
64 if (reader.get("image-top", imagefile_top)) {
65 image_top.reset(new Surface(imagefile_top));
67 if (reader.get("image-bottom", imagefile_bottom)) {
68 image_bottom.reset(new Surface(imagefile_bottom));
72 Background::~Background()
77 Background::update(float)
82 Background::set_image(const std::string& name, float speed)
84 this->imagefile = name;
87 image.reset(new Surface(name));
91 Background::draw(DrawingContext& context)
93 if(image.get() == NULL)
96 int w = (int) image->get_width();
97 int h = (int) image->get_height();
98 int sx = int(pos.x-context.get_translation().x * speed) % w - w;
99 int sy = int(pos.y-context.get_translation().y * speed_y) % h - h;
100 int center_image_py = int(pos.y-context.get_translation().y * speed_y);
101 int bottom_image_py = int(pos.y-context.get_translation().y * speed_y) + h;
102 context.push_transform();
103 context.set_translation(Vector(0, 0));
104 for(int x = sx; x < SCREEN_WIDTH; x += w) {
105 for(int y = sy; y < SCREEN_HEIGHT; y += h) {
106 if (image_top.get() != NULL && (y < center_image_py)) {
107 context.draw_surface(image_top.get(), Vector(x, y), layer);
110 if (image_bottom.get() != NULL && (y >= bottom_image_py)) {
111 context.draw_surface(image_bottom.get(), Vector(x, y), layer);
114 context.draw_surface(image.get(), Vector(x, y), layer);
117 context.pop_transform();
120 IMPLEMENT_FACTORY(Background, "background");