src/object/display_effect.cpp

   1 #include <config.h>
   2 #include "display_effect.hpp"
   3
   4 #include <assert.h>
   5 #include "video/drawing_context.hpp"
   6 #include "main.hpp"
   7
   8 DisplayEffect::DisplayEffect()
   9     : type(NO_FADE), fadetime(0), fading(0), black(false)
  10 {
  11  border_size = 0;
  12  borders_fading = false;
  13  borders_active = false;
  14 }
  15
  16 DisplayEffect::~DisplayEffect()
  17 {
  18 }
  19
  20 void
  21 DisplayEffect::update(float elapsed_time)
  22 {
  23     if (borders_fading) {
  24       if (border_size < 75) border_size += 1.5;
  25       else borders_active = true;
  26     }
  27     else if (borders_active) {
  28       if (border_size > 0) border_size -= 1.5;
  29       else borders_active = false;
  30     }
  31     switch(type) {
  32         case NO_FADE:
  33             return;
  34         case FADE_IN:
  35             fading -= elapsed_time;
  36             if(fading < 0) {
  37                 type = NO_FADE;
  38             }
  39             break;
  40         case FADE_OUT:
  41             fading -= elapsed_time;
  42             if(fading < 0) {
  43                 type = NO_FADE;
  44                 black = true;
  45             }
  46             break;
  47         default:
  48             assert(false);
  49     }
  50 }
  51
  52 void
  53 DisplayEffect::draw(DrawingContext& context)
  54 {
  55     context.push_transform();
  56     context.set_translation(Vector(0, 0));
  57
  58     if(black || type != NO_FADE) {
  59       float alpha;
  60       if(black) {
  61           alpha = 1.0f;
  62       } else {
  63           switch(type) {
  64               case FADE_IN:
  65                   alpha = fading / fadetime;
  66                   break;
  67               case FADE_OUT:
  68                   alpha = (fadetime-fading) / fadetime;
  69                   break;
  70               default:
  71                   alpha = 0;
  72                   assert(false);
  73           }
  74       }
  75       context.draw_filled_rect(Vector(0, 0), Vector(SCREEN_WIDTH, SCREEN_HEIGHT),
  76               Color(0, 0, 0, alpha), LAYER_GUI-10);
  77     }
  78
  79     if (borders_fading || borders_active) {
  80       context.draw_filled_rect(Vector(0, 0), Vector(SCREEN_WIDTH, border_size),
  81               Color(0, 0, 0, 1.0f), LAYER_GUI-10);
  82       context.draw_filled_rect(Vector(0, SCREEN_HEIGHT - border_size), Vector(SCREEN_WIDTH, border_size),
  83               Color(0, 0, 0, 1.0f), LAYER_GUI-10);
  84     }
  85
  86     context.pop_transform();
  87 }
  88
  89 void
  90 DisplayEffect::fade_out(float fadetime)
  91 {
  92     black = false;
  93     this->fadetime = fadetime;
  94     fading = fadetime;
  95     type = FADE_OUT;
  96 }
  97
  98 void
  99 DisplayEffect::fade_in(float fadetime)
 100 {
 101     black = false;
 102     this->fadetime = fadetime;
 103     fading = fadetime;
 104     type = FADE_IN;
 105 }
 106
 107 void
 108 DisplayEffect::set_black(bool enabled)
 109 {
 110     black = enabled;
 111 }
 112
 113 bool
 114 DisplayEffect::is_black()
 115 {
 116     return black;
 117 }
 118
 119 void
 120 DisplayEffect::sixteen_to_nine()
 121 {
 122   borders_fading = true;
 123 }
 124
 125 void
 126 DisplayEffect::four_to_three()
 127 {
 128   borders_fading = false;
 129 }
 130