Probability watch face (#69)

* Initial work on probability watch face

* Complete probability watch face

* Restore default movement_config

* PR feedback: PR watch face title, use arc4random, clean up warnings

* Use rand instead of arc4random when building on emulator

* Accidentally overwrote movement_config

4 files changed, 235 insertions, 0 deletions

diff --git a/movement/make/Makefile b/movement/make/Makefile
index 0936a26c..7c7cf2d6 100755
--- a/movement/make/Makefile
+++ b/movement/make/Makefile
@@ -61,6 +61,7 @@ SRCS += \
   ../watch_faces/complication/orrery_face.c \
   ../watch_faces/complication/astronomy_face.c \
   ../watch_faces/complication/tomato_face.c \
+  ../watch_faces/complication/probability_face.c \
 # New watch faces go above this line.
 
 # Leave this line at the bottom of the file; it has all the targets for making your project.
diff --git a/movement/movement_faces.h b/movement/movement_faces.h
index e7e78ff4..7c51b6ff 100644
--- a/movement/movement_faces.h
+++ b/movement/movement_faces.h
@@ -52,6 +52,7 @@
 #include "orrery_face.h"
 #include "astronomy_face.h"
 #include "tomato_face.h"
+#include "probability_face.h"
 // New includes go above this line.
 
 #endif // MOVEMENT_FACES_H_
diff --git a/movement/watch_faces/complication/probability_face.c b/movement/watch_faces/complication/probability_face.c
new file mode 100644
index 00000000..db193fb1
--- /dev/null
+++ b/movement/watch_faces/complication/probability_face.c
@@ -0,0 +1,182 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2022 Spencer Bywater
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+// Emulator only: need time() to seed the random number generator.
+#if __EMSCRIPTEN__
+#include <time.h>
+#endif
+
+#include <stdlib.h>
+#include <string.h>
+#include "probability_face.h"
+
+#define DEFAULT_DICE_SIDES 2
+#define PROBABILITY_ANIMATION_TICK_FREQUENCY 8
+const uint16_t NUM_DICE_TYPES = 8; // Keep this consistent with # of dice types below
+const uint16_t DICE_TYPES[] = {2, 4, 6, 8, 10, 12, 20, 100};
+
+
+// --------------
+// Custom methods
+// --------------
+
+static void display_dice_roll(probability_state_t *state) {
+    char buf[8];
+    if (state->rolled_value == 0) {
+        if (state->dice_sides == 100) {
+            sprintf(buf, " C    ");
+        } else {
+            sprintf(buf, "%2d    ", state->dice_sides);
+        }
+    } else if (state->dice_sides == 2) {
+        if (state->rolled_value == 1) {
+            sprintf(buf, "%2d   H", state->dice_sides);
+        } else {
+            sprintf(buf, "%2d   T", state->dice_sides);
+        }
+    } else if (state->dice_sides == 100) {
+        sprintf(buf, " C %3d", state->rolled_value);
+    } else {
+        sprintf(buf, "%2d %3d", state->dice_sides, state->rolled_value);
+    }
+    watch_display_string(buf, 4);
+}
+
+static void generate_random_number(probability_state_t *state) {
+    // Emulator: use rand. Hardware: use arc4random.
+    #if __EMSCRIPTEN__
+    state->rolled_value = rand() % state->dice_sides + 1;
+    #else
+    state->rolled_value = arc4random_uniform(state->dice_sides) + 1;
+    #endif
+}
+
+static void display_dice_roll_animation(probability_state_t *state) {
+    if (state->is_rolling) {
+        if (state->animation_frame == 0) {
+            watch_display_string("   ", 7);
+            watch_set_pixel(1, 4);
+            watch_set_pixel(1, 6);
+            state->animation_frame = 1;
+        } else if (state->animation_frame == 1) {
+            watch_clear_pixel(1, 4);
+            watch_clear_pixel(1, 6);
+            watch_set_pixel(2, 4);
+            watch_set_pixel(0, 6);
+            state->animation_frame = 2;
+        } else if (state->animation_frame == 2) {
+            watch_clear_pixel(2, 4);
+            watch_clear_pixel(0, 6);
+            watch_set_pixel(2, 5);
+            watch_set_pixel(0, 5);
+            state->animation_frame = 3;
+        } else if (state->animation_frame == 3) {
+            state->animation_frame = 0;
+            state->is_rolling = false;
+            movement_request_tick_frequency(1);
+            display_dice_roll(state);
+        }
+    }
+}
+
+
+// ---------------------------
+// Standard watch face methods
+// ---------------------------
+void probability_face_setup(movement_settings_t *settings, uint8_t watch_face_index, void ** context_ptr) {
+    (void) settings;
+    (void) watch_face_index;
+    if (*context_ptr == NULL) {
+        *context_ptr = malloc(sizeof(probability_state_t));
+        memset(*context_ptr, 0, sizeof(probability_state_t));
+    }
+    // Emulator only: Seed random number generator
+    #if __EMSCRIPTEN__
+    srand(time(NULL));
+    #endif
+}
+
+void probability_face_activate(movement_settings_t *settings, void *context) {
+    (void) settings;
+    probability_state_t *state = (probability_state_t *)context;
+
+    state->dice_sides = DEFAULT_DICE_SIDES;
+    state->rolled_value = 0;
+    watch_display_string("PR", 0);
+}
+
+bool probability_face_loop(movement_event_t event, movement_settings_t *settings, void *context) {
+    (void) settings;
+    probability_state_t *state = (probability_state_t *)context;
+
+    if (state->is_rolling && event.event_type != EVENT_TICK) {
+        return true;
+    }
+
+    switch (event.event_type) {
+        case EVENT_ACTIVATE:
+            display_dice_roll(state);
+            break;
+        case EVENT_TICK:
+            display_dice_roll_animation(state);
+            break;
+        case EVENT_MODE_BUTTON_UP:
+            movement_move_to_next_face();
+            break;
+        case EVENT_LIGHT_BUTTON_UP:
+            // Change how many sides the die has
+            for (int i = 0; i < NUM_DICE_TYPES; i++) {
+                if (DICE_TYPES[i] == state->dice_sides) {
+                    if (i == NUM_DICE_TYPES - 1) {
+                        state->dice_sides = DICE_TYPES[0];
+                    } else {
+                        state->dice_sides = DICE_TYPES[i + 1];
+                    }
+                    break;
+                }
+            }
+            state->rolled_value = 0;
+            display_dice_roll(state);
+            break;
+        case EVENT_ALARM_BUTTON_UP:
+            // Roll the die
+            generate_random_number(state);
+            state->is_rolling = true;
+            // Dice rolling animation begins on next tick and new roll will be displayed on completion
+            movement_request_tick_frequency(PROBABILITY_ANIMATION_TICK_FREQUENCY);
+            break;
+        case EVENT_TIMEOUT:
+            movement_move_to_face(0);
+            break;
+        default:
+            break;
+    }
+
+    return true;
+}
+
+void probability_face_resign(movement_settings_t *settings, void *context) {
+    (void) settings;
+    (void) context;
+}
diff --git a/movement/watch_faces/complication/probability_face.h b/movement/watch_faces/complication/probability_face.h
new file mode 100644
index 00000000..c6d3638f
--- /dev/null
+++ b/movement/watch_faces/complication/probability_face.h
@@ -0,0 +1,51 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2022 Spencer Bywater
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef PROBABILITY_FACE_H_
+#define PROBABILITY_FACE_H_
+
+#include "movement.h"
+
+typedef struct {
+    uint8_t dice_sides;
+    uint8_t rolled_value;
+    uint8_t animation_frame;
+    bool is_rolling;
+} probability_state_t;
+
+void probability_face_setup(movement_settings_t *settings, uint8_t watch_face_index, void ** context_ptr);
+void probability_face_activate(movement_settings_t *settings, void *context);
+bool probability_face_loop(movement_event_t event, movement_settings_t *settings, void *context);
+void probability_face_resign(movement_settings_t *settings, void *context);
+
+#define probability_face ((const watch_face_t){ \
+    probability_face_setup, \
+    probability_face_activate, \
+    probability_face_loop, \
+    probability_face_resign, \
+    NULL, \
+})
+
+#endif // PROBABILITY_FACE_H_
+