// along with this program. If not, see <http://www.gnu.org/licenses/>.
#include "object/background.hpp"
+
+#include <iostream>
+#include <math.h>
+#include <stdexcept>
+
+#include "math/sizef.hpp"
#include "supertux/globals.hpp"
#include "supertux/object_factory.hpp"
+#include "supertux/sector.hpp"
+#include "util/log.hpp"
#include "util/reader.hpp"
Background::Background() :
+ alignment(NO_ALIGNMENT),
layer(LAYER_BACKGROUND0),
imagefile_top(),
imagefile(),
pos(),
speed(),
speed_y(),
+ scroll_speed(),
+ scroll_offset(),
image_top(),
image(),
image_bottom()
}
Background::Background(const Reader& reader) :
+ alignment(NO_ALIGNMENT),
layer(LAYER_BACKGROUND0),
imagefile_top(),
imagefile(),
pos(),
speed(),
speed_y(),
+ scroll_speed(),
+ scroll_offset(),
image_top(),
image(),
image_bottom()
speed = 1.0;
speed_y = 1.0;
- reader.get("layer", layer);
+ std::string alignment_str;
+ if (reader.get("alignment", alignment_str))
+ {
+ if (alignment_str == "left")
+ {
+ alignment = LEFT_ALIGNMENT;
+ }
+ else if (alignment_str == "right")
+ {
+ alignment = RIGHT_ALIGNMENT;
+ }
+ else if (alignment_str == "top")
+ {
+ alignment = TOP_ALIGNMENT;
+ }
+ else if (alignment_str == "bottom")
+ {
+ alignment = BOTTOM_ALIGNMENT;
+ }
+ else if (alignment_str == "none")
+ {
+ alignment = NO_ALIGNMENT;
+ }
+ else
+ {
+ log_warning << "Background: invalid alignment: '" << alignment_str << "'" << std::endl;
+ alignment = NO_ALIGNMENT;
+ }
+ }
+
+ reader.get("scroll-offset-x", scroll_offset.x);
+ reader.get("scroll-offset-y", scroll_offset.y);
+
+ reader.get("scroll-speed-x", scroll_speed.x);
+ reader.get("scroll-speed-y", scroll_speed.y);
+
+ layer = reader_get_layer (reader, /* default = */ LAYER_BACKGROUND0);
+
if(!reader.get("image", imagefile) || !reader.get("speed", speed))
throw std::runtime_error("Must specify image and speed for background");
}
void
-Background::update(float)
+Background::update(float delta)
{
+ scroll_offset += scroll_speed * delta;
}
void
}
void
-Background::draw(DrawingContext& context)
+Background::draw_image(DrawingContext& context, const Vector& pos)
{
- if(image.get() == NULL)
- return;
+ Sizef level(Sector::current()->get_width(), Sector::current()->get_height());
+ Sizef screen(SCREEN_WIDTH, SCREEN_HEIGHT);
+ Sizef parallax_image_size = (1.0f - speed) * screen + level * speed;
+ Rectf cliprect = context.get_cliprect();
+
+ int start_x = static_cast<int>(floorf((cliprect.get_left() - (pos.x - image->get_width() /2.0f)) / image->get_width()));
+ int end_x = static_cast<int>(ceilf((cliprect.get_right() - (pos.x + image->get_width() /2.0f)) / image->get_width()))+1;
+ int start_y = static_cast<int>(floorf((cliprect.get_top() - (pos.y - image->get_height()/2.0f)) / image->get_height()));
+ int end_y = static_cast<int>(ceilf((cliprect.get_bottom() - (pos.y + image->get_height()/2.0f)) / image->get_height()))+1;
- int w = (int) image->get_width();
- int h = (int) image->get_height();
- int sx = int(pos.x-context.get_translation().x * speed) % w - w;
- int sy = int(pos.y-context.get_translation().y * speed_y) % h - h;
- int center_image_py = int(pos.y-context.get_translation().y * speed_y);
- int bottom_image_py = int(pos.y-context.get_translation().y * speed_y) + h;
- context.push_transform();
- context.set_translation(Vector(0, 0));
- for(int x = sx; x < SCREEN_WIDTH; x += w) {
- for(int y = sy; y < SCREEN_HEIGHT; y += h) {
- if (image_top.get() != NULL && (y < center_image_py)) {
- context.draw_surface(image_top.get(), Vector(x, y), layer);
- continue;
+ switch(alignment)
+ {
+ case LEFT_ALIGNMENT:
+ for(int y = start_y; y < end_y; ++y)
+ {
+ Vector p(pos.x - parallax_image_size.width / 2.0f,
+ pos.y + y * image->get_height() - image->get_height() / 2.0f);
+ context.draw_surface(image, p, layer);
}
- if (image_bottom.get() != NULL && (y >= bottom_image_py)) {
- context.draw_surface(image_bottom.get(), Vector(x, y), layer);
- continue;
+ break;
+
+ case RIGHT_ALIGNMENT:
+ for(int y = start_y; y < end_y; ++y)
+ {
+ Vector p(pos.x + parallax_image_size.width / 2.0f - image->get_width(),
+ pos.y + y * image->get_height() - image->get_height() / 2.0f);
+ context.draw_surface(image, p, layer);
}
- context.draw_surface(image.get(), Vector(x, y), layer);
- }
+ break;
+
+ case TOP_ALIGNMENT:
+ for(int x = start_x; x < end_x; ++x)
+ {
+ Vector p(pos.x + x * image->get_width() - image->get_width() / 2.0f,
+ pos.y - parallax_image_size.height / 2.0f);
+ context.draw_surface(image, p, layer);
+ }
+ break;
+
+ case BOTTOM_ALIGNMENT:
+ for(int x = start_x; x < end_x; ++x)
+ {
+ Vector p(pos.x + x * image->get_width() - image->get_width() / 2.0f,
+ pos.y - image->get_height() + parallax_image_size.height / 2.0f);
+ context.draw_surface(image, p, layer);
+ }
+ break;
+
+ case NO_ALIGNMENT:
+ for(int y = start_y; y < end_y; ++y)
+ for(int x = start_x; x < end_x; ++x)
+ {
+ Vector p(pos.x + x * image->get_width() - image->get_width()/2,
+ pos.y + y * image->get_height() - image->get_height()/2);
+
+ if (image_top.get() != NULL && (y < 0))
+ {
+ context.draw_surface(image_top, p, layer);
+ }
+ else if (image_bottom.get() != NULL && (y > 0))
+ {
+ context.draw_surface(image_bottom, p, layer);
+ }
+ else
+ {
+ context.draw_surface(image, p, layer);
+ }
+ }
+ break;
}
- context.pop_transform();
+}
+
+void
+Background::draw(DrawingContext& context)
+{
+ if(image.get() == NULL)
+ return;
+
+ Sizef level_size(Sector::current()->get_width(),
+ Sector::current()->get_height());
+ Sizef screen(SCREEN_WIDTH, SCREEN_HEIGHT);
+ Sizef translation_range = level_size - screen;
+ Vector center_offset(context.get_translation().x - translation_range.width / 2.0f,
+ context.get_translation().y - translation_range.height / 2.0f);
+
+ // FIXME: We are not handling 'pos'
+ draw_image(context, Vector(level_size.width / 2.0f, level_size.height / 2.0f) + center_offset * (1.0f - speed));
}
/* EOF */
projects / supertux.git / blobdiff