Question

我想为我的鹅卵石写一个模拟表面，所以我决定开始制作一个秒针动画，以确保我明白我在做什么。我做到了这一点，奇怪的是它只在0到22秒之间工作。一旦它超过23秒，它就会崩溃，直到下一分钟开始才会再次正确启动。

我有一个占据整个屏幕的图层，这是更新图层的回调函数：

void face_layer_update_callback(Layer *me, GContext* ctx) {

  //set colour
  graphics_context_set_stroke_color(ctx,  GColorBlack);

  time_t now = time(NULL);
  struct tm *t = localtime(&now);
  int seconds = t->tm_sec;

  int hand_length = 50;

  GPoint p0 = GPoint(72, 84);

  int x, y, z;

  z = seconds * 6;

  x = hand_length * sin( (PI/180) * z);
  y = hand_length * cos( (PI/180) * z);

  GPoint p1 = GPoint(72 + x, 84 - y);

  graphics_draw_line(ctx, p0, p1);

}

我添加了日志记录来输出计算出的值z，x和y，它们正是我所期望的。任何人都可以看到可能出现的问题吗？

（顺便说一下，这是在原始的鹅卵石上，而不是卵石时间。）

更新：根据Thomas的评论，我添加了更多日志记录，现在代码如下：

void face_layer_update_callback(Layer *me, GContext* ctx) {

  APP_LOG(APP_LOG_LEVEL_DEBUG, "Start of callback routine");

  //set colour
  graphics_context_set_stroke_color(ctx,  GColorBlack);

  time_t now = time(NULL);
  struct tm *t = localtime(&now);
  int seconds = t->tm_sec;

  APP_LOG(APP_LOG_LEVEL_DEBUG, "seconds: %d", seconds);

  int hand_length = 50;

  GPoint p0 = GPoint(72, 84);

  int x, y;
  int degrees;

  degrees = seconds * 6;
  float radians = (PI/180) * degrees;

  APP_LOG(APP_LOG_LEVEL_DEBUG, "About to do trigonometry: degrees = %d", degrees);

  x = hand_length * sin(radians);
  APP_LOG(APP_LOG_LEVEL_DEBUG, "Done sin, about to do cos");
  y = hand_length * cos(radians);

  APP_LOG(APP_LOG_LEVEL_DEBUG, "x = %d", x);
  APP_LOG(APP_LOG_LEVEL_DEBUG, "y = %d", y);
  APP_LOG(APP_LOG_LEVEL_DEBUG, "End of hand: %d, %d", 72 + x, 84 - y);

  GPoint p1 = GPoint(72 + x, 84 - y);

  APP_LOG(APP_LOG_LEVEL_DEBUG, "About to draw hand");

  graphics_draw_line(ctx, p0, p1);

日志记录显示：

[INFO    ] D analogueface.c:11 Start of callback routine
[INFO    ] D analogueface.c:20 seconds: 21
[INFO    ] D analogueface.c:32 About to do trigonometry: degrees = 126
[INFO    ] D analogueface.c:35 Done sin, about to do cos
[INFO    ] D analogueface.c:38 x = 40
[INFO    ] D analogueface.c:39 y = -29
[INFO    ] D analogueface.c:40 End of hand: 112, 113
[INFO    ] D analogueface.c:44 About to draw hand
[INFO    ] D analogueface.c:11 Start of callback routine
[INFO    ] D analogueface.c:20 seconds: 22
[INFO    ] D analogueface.c:32 About to do trigonometry: degrees = 132
[INFO    ] D analogueface.c:35 Done sin, about to do cos
[INFO    ] D analogueface.c:38 x = 37
[INFO    ] D analogueface.c:39 y = -33
[INFO    ] D analogueface.c:40 End of hand: 109, 117
[INFO    ] D analogueface.c:44 About to draw hand
[INFO    ] D analogueface.c:11 Start of callback routine
[INFO    ] D analogueface.c:20 seconds: 23
[INFO    ] D analogueface.c:32 About to do trigonometry: degrees = 138

我尝试记录弧度值，但不会在日志中对其进行格式化。

（对于试图将评论内容放在不应该出现的评论中的道歉）。

卵石 - 秒针导致23秒坠机

0 个答案: