src/game/level/level_editor/color_picker.c

   1 #include <stdbool.h>
   2
   3 #include "game/level/boxes.h"
   4 #include "system/stacktrace.h"
   5 #include "system/line_stream.h"
   6 #include "system/log.h"
   7 #include "game/camera.h"
   8 #include "color_picker.h"
   9 #include "color.h"
  10
  11 #define COLOR_SLIDER_HEIGHT 50.0f
  12 #define COLOR_SLIDER_WIDTH 300.0f
  13 #define COLOR_SLIDER_PADDING_BOTTOM 10.0f
  14
  15 const char *slider_labels[COLOR_SLIDER_N] = {
  16     "Hue",
  17     "Saturation",
  18     "Lightness"
  19 };
  20
  21 LayerPtr color_picker_as_layer(ColorPicker *color_picker)
  22 {
  23     LayerPtr layer = {
  24         .ptr = color_picker,
  25         .type = LAYER_COLOR_PICKER
  26     };
  27     return layer;
  28 }
  29
  30 ColorPicker create_color_picker_from_rgba(Color color)
  31 {
  32     Color color_hsla = rgba_to_hsla(color);
  33     ColorPicker color_picker = {
  34         .sliders = {
  35             {0, color_hsla.r, 360.0f},
  36             {0, color_hsla.g, 1.0f},
  37             {0, color_hsla.b, 1.0f}
  38         }
  39     };
  40     return color_picker;
  41 }
  42
  43 int color_picker_read_from_line_stream(ColorPicker *color_picker,
  44                                        LineStream *line_stream)
  45 {
  46     char color[7];
  47     const char *line = line_stream_next(line_stream);
  48     if (line == NULL) {
  49         return -1;
  50     }
  51
  52     if (sscanf(line, "%6s", color) == EOF) {
  53         log_fail("Could not read color\n");
  54     }
  55
  56     *color_picker = create_color_picker_from_rgba(hexstr(color));
  57
  58     return 0;
  59 }
  60
  61 int color_picker_render(const ColorPicker *color_picker,
  62                         Camera *camera)
  63 {
  64     trace_assert(color_picker);
  65     trace_assert(camera);
  66
  67     if (camera_fill_rect_screen(
  68             camera,
  69             rect(0.0f, 0.0f, COLOR_SLIDER_WIDTH, COLOR_SLIDER_HEIGHT),
  70             color_picker_rgba(color_picker)) < 0) {
  71         return -1;
  72     }
  73
  74     for (ColorPickerSlider index = 0; index < COLOR_SLIDER_N; ++index) {
  75         const Rect slider_rect =
  76             rect(0.0f, (COLOR_SLIDER_HEIGHT + COLOR_SLIDER_PADDING_BOTTOM) * (float) (index + 1),
  77                  COLOR_SLIDER_WIDTH, COLOR_SLIDER_HEIGHT);
  78         const Point label_size = vec(2.5f, 2.5f);
  79
  80         if (slider_render(
  81                 &color_picker->sliders[index],
  82                 camera,
  83                 slider_rect) < 0) {
  84             return -1;
  85         }
  86
  87         if (camera_render_text_screen(
  88                 camera,
  89                 slider_labels[index],
  90                 label_size,
  91                 COLOR_BLACK,
  92                 vec(slider_rect.x + COLOR_SLIDER_WIDTH,
  93                     slider_rect.y + COLOR_SLIDER_HEIGHT * 0.5f - label_size.y * (float) FONT_CHAR_HEIGHT * 0.5f)) < 0) {
  94             return -1;
  95         }
  96     }
  97
  98     return 0;
  99 }
 100
 101 // TODO(#932): the `selected` event propagation control is cumbersome
 102 int color_picker_event(ColorPicker *color_picker, const SDL_Event *event, int *selected_out)
 103 {
 104     trace_assert(color_picker);
 105     trace_assert(event);
 106
 107     int selected = 0;
 108
 109     for (ColorPickerSlider index = 0;
 110          !selected && index < COLOR_SLIDER_N;
 111          ++index) {
 112         if (slider_event(
 113                 &color_picker->sliders[index],
 114                 event,
 115                 rect(0.0f, (COLOR_SLIDER_HEIGHT + COLOR_SLIDER_PADDING_BOTTOM) * (float) (index + 1),
 116                      COLOR_SLIDER_WIDTH, COLOR_SLIDER_HEIGHT),
 117                 &selected) < 0) {
 118             return -1;
 119         }
 120     }
 121
 122     if (selected_out) {
 123         *selected_out = selected;
 124     }
 125
 126     return 0;
 127 }
 128
 129 Color color_picker_rgba(const ColorPicker *color_picker)
 130 {
 131     return hsla(
 132         color_picker->sliders[COLOR_SLIDER_HUE].value,
 133         color_picker->sliders[COLOR_SLIDER_SAT].value,
 134         color_picker->sliders[COLOR_SLIDER_LIT].value,
 135         1.0f);
 136 }