Add the trig menu.

Change-Id: Ifbe2518cb3a089dace82d56031987fbc7a2e6181

app/utils.cpp

@@ -34,6 +34,85 @@ static void print_prompt(char* text, int index) {
   KDDrawChar(text[index], KDPointMake(index * font_size.width, SCREEN_HEIGHT - (PROMPT_HEIGHT / 2)), true);
 }
 
+static void clear_trig_menu() {
+  {
+    KDRect r;
+    r.x = SCREEN_WIDTH / 4 - 1;
+    r.y = SCREEN_HEIGHT / 4 - 1;
+    r.width = SCREEN_WIDTH / 2 + 2;
+    r.height = SCREEN_HEIGHT / 2 + 2;
+    KDFillRect(r, 0x00);
+  }
+}
+
+static void print_trig_menu() {
+  {
+    KDRect r;
+    r.x = SCREEN_WIDTH / 4 - 1;
+    r.y = SCREEN_HEIGHT / 4 - 1;
+    r.width = SCREEN_WIDTH / 2 + 2;
+    r.height = SCREEN_HEIGHT / 2 + 2;
+    KDFillRect(r, 0xFF);
+  }
+  {
+    KDRect r;
+    r.x = SCREEN_WIDTH / 4;
+    r.y = SCREEN_HEIGHT / 4;
+    r.width = SCREEN_WIDTH / 2;
+    r.height = SCREEN_HEIGHT / 2;
+    KDFillRect(r, 0x00);
+  }
+}
+
+static int get_trig_input(char* input) {
+  int pos = 0;
+  const char* kTexts[] = {
+    "sine",
+    "cosine",
+    "tangent",
+    "cancel"
+  };
+  const char* kOutputs[] = {
+    "sin( )",
+    "cos( )",
+    "tan( )",
+  };
+  const KDPoint orig = KDPointMake(SCREEN_WIDTH / 4, SCREEN_HEIGHT / 4);
+  while (true) {
+    print_trig_menu();
+
+    uint16_t vert_acc = 0;
+    for (int i(0); i<4; i++) {
+      KDSize text_size = KDStringSize(kTexts[i]);
+      KDDrawString(kTexts[i],
+          KDPointMake(orig.x, orig.y + vert_acc + text_size.height / 2),
+          i==pos);
+      vert_acc += text_size.height;
+    }
+
+    ion_event_t event = ion_get_event();
+    if (event == UP_ARROW) {
+      pos--;
+      if (pos < 0) {
+        pos = 0;
+      }
+    } else if (event == DOWN_ARROW) {
+      pos++;
+      if (pos >= 4) {
+        pos = 3;
+      }
+    } else if (event == '=') {
+      clear_trig_menu();
+      if (pos == 3) {
+        return 0;
+      } else {
+        memcpy(input, kOutputs[pos], (size_t) strlen(kOutputs[pos]));
+        return strlen(kOutputs[pos]);
+      }
+    }
+  }
+}
+
 char* get_text() {
   char input[255] = {0};
   int index = 0;
@@ -60,10 +139,20 @@ char* get_text() {
       input[index++] = (char) event;
       // We are at the end of the line.
       if (index > max) {
-        max++;
+        max=index;
         input[max] = ' ';
         input[max+1] = '\0';
       }
+    } else if (event == TRIG_MENU) {
+      int tmp = get_trig_input(&input[index]);
+      index+=tmp;
+      if (index > max) {
+        max=index;
+        input[max] = ' ';
+        input[max+1] = '\0';
+      }
+      // we want to be inside the parenthese if there are some.
+      index -= (tmp > 2) ? 2 : 0;
     }
   }