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),
38 Background::Background(const Reader& reader) :
39 layer(LAYER_BACKGROUND0),
52 // read position, defaults to (0,0)
57 this->pos = Vector(px,py);
62 reader.get("scroll-offset-x", scroll_offset.x);
63 reader.get("scroll-offset-y", scroll_offset.y);
65 reader.get("scroll-speed-x", scroll_speed.x);
66 reader.get("scroll-speed-y", scroll_speed.y);
68 reader.get("layer", layer);
69 if(!reader.get("image", imagefile) || !reader.get("speed", speed))
70 throw std::runtime_error("Must specify image and speed for background");
72 set_image(imagefile, speed);
73 if (!reader.get("speed-y", speed_y))
78 if (reader.get("image-top", imagefile_top)) {
79 image_top = Surface::create(imagefile_top);
81 if (reader.get("image-bottom", imagefile_bottom)) {
82 image_bottom = Surface::create(imagefile_bottom);
86 Background::~Background()
91 Background::update(float delta)
93 scroll_offset += scroll_speed * delta;
97 Background::set_image(const std::string& name, float speed)
99 this->imagefile = name;
102 image = Surface::create(name);
106 Background::draw(DrawingContext& context)
108 if(image.get() == NULL)
111 int w = (int) image->get_width();
112 int h = (int) image->get_height();
113 int sx = int(scroll_offset.x + pos.x-context.get_translation().x * speed) % w - w;
114 int sy = int(scroll_offset.y + pos.y-context.get_translation().y * speed_y) % h - h;
115 int center_image_py = int(pos.y-context.get_translation().y * speed_y);
116 int bottom_image_py = int(pos.y-context.get_translation().y * speed_y) + h;
117 context.push_transform();
118 context.set_translation(Vector(0, 0));
119 for(int x = sx; x < SCREEN_WIDTH; x += w) {
120 for(int y = sy; y < SCREEN_HEIGHT; y += h) {
121 if (image_top.get() != NULL && (y < center_image_py)) {
122 context.draw_surface(image_top.get(), Vector(x, y), layer);
125 if (image_bottom.get() != NULL && (y >= bottom_image_py)) {
126 context.draw_surface(image_bottom.get(), Vector(x, y), layer);
129 context.draw_surface(image.get(), Vector(x, y), layer);
132 context.pop_transform();