Initial commit

application.fam

@@ -0,0 +1,12 @@
+App(
+    appid="etch",
+    name="Etch A Sketch",
+    apptype=FlipperAppType.EXTERNAL,
+    entry_point="etch_a_sketch_app",
+    cdefines=["APP_ETCH_A_SKETCH"],
+    requires=["gui"],
+    stack_size=2 * 1024,
+    order=175,
+    fap_icon="etch-a-sketch-icon.png",
+    fap_category="Misc",
+)

etch-a-sketch.c

@@ -0,0 +1,147 @@
+#include <furi.h>
+#include <furi_hal.h>
+#include <gui/gui.h>
+#include <input/input.h>
+#include <notification/notification.h>
+#include <notification/notification_messages.h>
+#include <stdbool.h> // Header-file for boolean data-type.
+
+typedef struct selected_position {
+    int x;
+    int y;
+} selected_position;
+
+typedef struct {
+    selected_position selected;
+    bool board[32][16];
+    bool isDrawing;
+} EtchData;
+
+void etch_draw_callback(Canvas* canvas, void* ctx) {
+    const EtchData* etch_state = acquire_mutex((ValueMutex*)ctx, 25);
+    UNUSED(ctx);
+    canvas_clear(canvas);
+    canvas_set_color(canvas, ColorBlack);
+    //draw the canvas(32x16) on screen(144x64) using 4x4 tiles
+    for(int y = 0; y < 16; y++) {
+        for(int x = 0; x < 32; x++) {
+            if(etch_state->board[x][y]) {
+                canvas_draw_box(canvas, x * 4, y * 4, 4, 4);
+            }
+        }
+    }
+
+    //draw cursor as a 4x4 black box with a 2x2 white box inside
+    canvas_set_color(canvas, ColorBlack);
+    canvas_draw_box(canvas, etch_state->selected.x * 4, etch_state->selected.y * 4, 4, 4);
+    canvas_set_color(canvas, ColorWhite);
+    canvas_draw_box(canvas, etch_state->selected.x * 4 + 1, etch_state->selected.y * 4 + 1, 2, 2);
+
+    //release the mutex
+    release_mutex((ValueMutex*)ctx, etch_state);
+}
+
+void etch_input_callback(InputEvent* input_event, void* ctx) {
+    furi_assert(ctx);
+    FuriMessageQueue* event_queue = ctx;
+    furi_message_queue_put(event_queue, input_event, FuriWaitForever);
+}
+
+int32_t etch_a_sketch_app(void* p) {
+    UNUSED(p);
+    FuriMessageQueue* event_queue = furi_message_queue_alloc(8, sizeof(InputEvent));
+
+    EtchData* etch_state = malloc(sizeof(EtchData));
+    ValueMutex etch_state_mutex;
+    if(!init_mutex(&etch_state_mutex, etch_state, sizeof(EtchData))) {
+        FURI_LOG_E("etch", "cannot create mutex\r\n");
+        free(etch_state);
+        return -1;
+    }
+
+    // Configure view port
+    ViewPort* view_port = view_port_alloc();
+    view_port_draw_callback_set(view_port, etch_draw_callback, &etch_state_mutex);
+    view_port_input_callback_set(view_port, etch_input_callback, event_queue);
+
+    // Register view port in GUI
+    Gui* gui = furi_record_open(RECORD_GUI);
+    gui_add_view_port(gui, view_port, GuiLayerFullscreen);
+
+    //NotificationApp* notification = furi_record_open(RECORD_NOTIFICATION);
+
+    InputEvent event;
+
+    while(furi_message_queue_get(event_queue, &event, FuriWaitForever) == FuriStatusOk) {
+        //break out of the loop if the back key is pressed
+        if(event.type == InputTypeShort && event.key == InputKeyBack) {
+            break;
+        }
+
+        //check the key pressed and change x and y accordingly
+        if(event.type == InputTypeShort) {
+            switch(event.key) {
+            case InputKeyUp:
+                etch_state->selected.y -= 1;
+                break;
+            case InputKeyDown:
+                etch_state->selected.y += 1;
+                break;
+            case InputKeyLeft:
+                etch_state->selected.x -= 1;
+                break;
+            case InputKeyRight:
+                etch_state->selected.x += 1;
+                break;
+            case InputKeyOk:
+                etch_state->board[etch_state->selected.x][etch_state->selected.y] =
+                    !etch_state->board[etch_state->selected.x][etch_state->selected.y];
+                break;
+
+            default:
+                break;
+            }
+
+            //check if cursor position is out of bounds and reset it to the closest position
+            if(etch_state->selected.x < 0) {
+                etch_state->selected.x = 0;
+            }
+            if(etch_state->selected.x > 31) {
+                etch_state->selected.x = 31;
+            }
+            if(etch_state->selected.y < 0) {
+                etch_state->selected.y = 0;
+            }
+            if(etch_state->selected.y > 15) {
+                etch_state->selected.y = 15;
+            }
+            if(etch_state->isDrawing == true) {
+                etch_state->board[etch_state->selected.x][etch_state->selected.y] = true;
+            }
+            view_port_update(view_port);
+        }
+        if(event.key == InputKeyBack && event.type == InputTypeLong) {
+            etch_state->board[1][1] = true;
+            for(int y = 0; y < 16; y++) {
+                for(int x = 0; x < 32; x++) {
+                    etch_state->board[x][y] = false;
+                }
+            }
+            view_port_update(view_port);
+        }
+        if(event.key == InputKeyOk && event.type == InputTypeLong) {
+            etch_state->isDrawing = !etch_state->isDrawing;
+            etch_state->board[etch_state->selected.x][etch_state->selected.y] = true;
+            view_port_update(view_port);
+        }
+    }
+
+    gui_remove_view_port(gui, view_port);
+    view_port_free(view_port);
+    furi_message_queue_free(event_queue);
+    free(etch_state);
+    furi_record_close(RECORD_NOTIFICATION);
+    furi_record_close(RECORD_GUI);
+
+    return 0;
+}