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annotate infinite_canvas/canvas.h @ 276:b55c22cff335

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Add interactive infinite canvas prototype
author MrJuneJune <me@mrjunejune.com>
date Mon, 17 Aug 2026 16:57:56 -0700
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children 8d560f50ed4c
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1 #ifndef INFINITE_CANVAS_CANVAS_H
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2 #define INFINITE_CANVAS_CANVAS_H
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3
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4 #include "dowa/dowa.h"
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5 #include "infinite_canvas/theme.h"
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6 #include "third_party/raylib/include/raylib.h"
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7
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8 #define CANVAS_MAX_ENTITIES 1024
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9 #define CANVAS_WEB_FRAME_INSET 8.0f
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10 #define CANVAS_WEB_RESIZE_HANDLE 18.0f
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11 #define CANVAS_WEB_MIN_WIDTH 160.0f
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12 #define CANVAS_WEB_MIN_HEIGHT 120.0f
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13 #define CANVAS_CONTEXT_MAX_LENGTH (64 * 1024)
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14
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15 typedef enum {
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16 CANVAS_ENTITY_RECTANGLE = 0,
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17 CANVAS_ENTITY_CIRCLE,
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18 CANVAS_ENTITY_LINE,
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19 CANVAS_ENTITY_TEXT,
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20 CANVAS_ENTITY_BUTTON,
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21 CANVAS_ENTITY_TEXT_AREA,
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22 CANVAS_ENTITY_DROPDOWN,
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23 CANVAS_ENTITY_ACCORDION,
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24 CANVAS_ENTITY_CARD,
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25 CANVAS_ENTITY_CALENDAR,
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26 CANVAS_ENTITY_SWITCH,
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27 CANVAS_ENTITY_TABLE,
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28 CANVAS_ENTITY_NOTIFICATION,
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29 CANVAS_ENTITY_SCROLL_AREA,
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30 CANVAS_ENTITY_IMAGE,
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31 CANVAS_ENTITY_WEB_CONTENT,
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32 CANVAS_ENTITY_TYPE_COUNT,
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33 } Canvas_Entity_Type;
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34
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35 typedef struct {
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36 uint32 id;
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37 Canvas_Entity_Type type;
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38 Vector2 position;
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39 Vector2 size;
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40 Color color;
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41 char text[128];
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42 int32 value;
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43 boolean active;
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44 boolean pinned;
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45 boolean screen_space_initialized;
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46 float hover_amount;
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47 float animation_amount;
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48 Vector2 pinned_screen_position;
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49 Vector2 pinned_screen_size;
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50 } Canvas_Entity;
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51
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52 typedef struct {
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53 Vector2 target;
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54 float zoom;
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55 int32 viewport_width;
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56 int32 viewport_height;
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57 float min_zoom;
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58 float max_zoom;
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59 } Canvas_Camera;
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60
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61 typedef struct {
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62 Dowa_Arena *p_arena;
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63 Canvas_Entity *p_entities;
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64 uint32 next_entity;
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65 uint32 next_entity_id;
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66 int32 selected_index;
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67 int32 pressed_index;
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68 int32 hover_index;
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69 boolean dragging;
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70 boolean resizing;
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71 boolean show_grid;
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72 float notification_stack_amount;
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73 Vector2 pointer_start;
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74 Vector2 entity_start;
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75 Vector2 entity_size_start;
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76 } Canvas_Scene;
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77
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78 typedef struct {
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79 size_t visible_count;
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80 size_t bytes_written;
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81 boolean truncated;
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82 } Canvas_Context_Snapshot;
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83
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84 void Canvas_Camera_Init(Canvas_Camera *p_camera, int32 width, int32 height);
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85 void Canvas_Camera_Set_Viewport(Canvas_Camera *p_camera, int32 width, int32 height);
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86 Vector2 Canvas_Camera_Screen_To_World(const Canvas_Camera *p_camera, Vector2 screen);
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87 Vector2 Canvas_Camera_World_To_Screen(const Canvas_Camera *p_camera, Vector2 world);
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88 void Canvas_Camera_Pan(Canvas_Camera *p_camera, Vector2 screen_delta);
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89 void Canvas_Camera_Zoom_At(
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90 Canvas_Camera *p_camera,
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91 Vector2 screen_anchor,
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92 float zoom_multiplier);
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93 Rectangle Canvas_Camera_Viewport_Bounds(const Canvas_Camera *p_camera);
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94 float Canvas_Grid_Spacing(float zoom);
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95
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96 void Canvas_Scene_Init(Canvas_Scene *p_scene, Dowa_Arena *p_arena);
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97 boolean Canvas_Scene_Add(Canvas_Scene *p_scene, Canvas_Entity_Type type, Vector2 position);
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98 void Canvas_Scene_Clear(Canvas_Scene *p_scene);
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99 void Canvas_Scene_Add_Demo(Canvas_Scene *p_scene);
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100 void Canvas_Scene_Add_Browser_Grid(Canvas_Scene *p_scene);
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101 int32 Canvas_Scene_Pick(
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102 const Canvas_Scene *p_scene,
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103 Vector2 world_pointer,
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104 float zoom);
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105 boolean Canvas_Scene_Update_Interaction(
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106 Canvas_Scene *p_scene,
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107 const Canvas_Camera *p_camera,
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108 boolean block_pointer_input);
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109 boolean Canvas_Scene_Is_Text_Editing(const Canvas_Scene *p_scene);
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110 void Canvas_Scene_Toggle_Selected_Pin(
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111 Canvas_Scene *p_scene,
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112 const Canvas_Camera *p_camera);
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113 void Canvas_Scene_Sync_Pinned(
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114 Canvas_Scene *p_scene,
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115 const Canvas_Camera *p_camera);
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116 void Canvas_Scene_Update_Notification_Stack(
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117 Canvas_Scene *p_scene,
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118 const Canvas_Camera *p_camera);
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119 Canvas_Context_Snapshot Canvas_Scene_Build_Visible_Context(
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120 const Canvas_Scene *p_scene,
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121 const Canvas_Camera *p_camera,
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122 char *p_buffer,
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123 size_t buffer_size);
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124
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125 void Canvas_Update_Camera_Input(
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126 Canvas_Camera *p_camera,
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127 boolean block_pointer_input,
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128 boolean block_keyboard_input);
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129 void Canvas_Draw_World(
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130 const Canvas_Camera *p_camera,
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131 const Canvas_Scene *p_scene,
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132 Font font,
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133 const Canvas_Theme *p_theme);
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134
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135 const char *Canvas_Entity_Type_Name(Canvas_Entity_Type type);
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136
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137 #endif