卵石：如何创建自定义动画？

Question

我在Pebble上实现自定义动画时遇到了麻烦。这里没有任何真正的在线教程跟着，我能找到的唯一的事情是官方的卵石之一：https://developer.pebble.com/guides/pebble-apps/display-and-animations/property-animations/#writing-custom-animation-types

这是我的项目的代码部分：

static Animation *large_pin_animation; 

static void anim_update_handler(Animation *animation, const AnimationProgress progress) { 
    APP_LOG(APP_LOG_LEVEL_INFO, "%d", (int)progress); 
} 

static void window_load(Window *window) { 
    large_pin_animation = animation_create(); 
    animation_set_duration(large_pin_animation, 1000); 
    animation_set_delay(large_pin_animation, 0); 
    AnimationImplementation anim_implementation = (AnimationImplementation) { 
    .update = anim_update_handler 
    }; 
    animation_set_implementation(large_pin_animation, &anim_implementation); 
} 

当我打电话animation_schedule(large_pin_animation);应用程序崩溃，并且卵石日志没有帮助（它说应用程序故障，所以某种段错误）。有什么我失踪？

Answer 1

问题是anim_implementation变量的范围。它应该声明在哪里声明动画，否则在window_load它超出范围并且被释放，所以在我试图运行动画的其他函数中，它不知道什么anim_implementation已经是。

我的另一个问题是，为了多次运行动画，我不得不重新创建动画。所以，最后我把所有的动画素材放在一个单独的函数中：

static Animation *large_pin_animation; 
static AnimationImplementation anim_implementation; 

static void anim_update_handler(Animation *animation, const AnimationProgress progress) { 
    APP_LOG(APP_LOG_LEVEL_INFO, "%d", (int)progress); 
} 

static void animate_large_pin() { 
    large_pin_animation = animation_create(); 
    animation_set_duration(large_pin_animation, 1000); 
    animation_set_delay(large_pin_animation, 0); 
    anim_implementation = (AnimationImplementation) { 
    .update = anim_update_handler 
    }; 
    animation_set_implementation(large_pin_animation, &anim_implementation); 
    animation_schedule(large_pin_animation); 
}