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lv_anim: add ease_in/out path

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This commit is contained in:
Gabor Kiss-Vamosi 2019-01-22 15:50:00 +01:00
parent 7c6d92ec10
commit 10b86cea37
2 changed files with 60 additions and 1 deletions
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48
lv_misc/lv_anim.c
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@ -157,7 +157,6 @@ uint16_t lv_anim_speed_to_time(uint16_t speed, int32_t start, int32_t end)
int32_t lv_anim_path_linear(const lv_anim_t * a)
{
/*Calculate the current step*/
uint16_t step;
if(a->time == a->act_time) step = LV_ANIM_RESOLUTION; /*Use the last value if the time fully elapsed*/
else step = (a->act_time * LV_ANIM_RESOLUTION) / a->time;
@ -172,6 +171,53 @@ int32_t lv_anim_path_linear(const lv_anim_t * a)
return new_value;
}
/**
* Calculate the current value of an animation slowing down the start phase
* @param a pointer to an animation
* @return the current value to set
*/
int32_t lv_anim_path_ease_in(const lv_anim_t * a)
{
/*Calculate the current step*/
uint32_t t;
if(a->time == a->act_time) t = 1024;
else t = (uint32_t)((uint32_t)a->act_time * 1024) / a->time;
int32_t step = lv_bezier3(t, 0, 1, 1, 1024);
int32_t new_value;
new_value = (int32_t) step * (a->end - a->start);
new_value = new_value >> 10;
new_value += a->start;
return new_value;
}
/**
* Calculate the current value of an animation slowing down the end phase
* @param a pointer to an animation
* @return the current value to set
*/
int32_t lv_anim_path_ease_out(const lv_anim_t * a)
{
/*Calculate the current step*/
uint32_t t;
if(a->time == a->act_time) t = 1024;
else t = (uint32_t)((uint32_t)a->act_time * 1024) / a->time;
int32_t step = lv_bezier3(t, 0, 1023, 1023, 1024);
int32_t new_value;
new_value = (int32_t) step * (a->end - a->start);
new_value = new_value >> 10;
new_value += a->start;
return new_value;
}
/**
* Calculate the current value of an animation applying an "S" characteristic (cosine)
* @param a pointer to an animation

13
lv_misc/lv_anim.h
View File

@ -121,6 +121,19 @@ uint16_t lv_anim_speed_to_time(uint16_t speed, int32_t start, int32_t end);
*/
int32_t lv_anim_path_linear(const lv_anim_t *a);
/**
* Calculate the current value of an animation slowing down the start phase
* @param a pointer to an animation
* @return the current value to set
*/
int32_t lv_anim_path_ease_in(const lv_anim_t * a);
/**
* Calculate the current value of an animation slowing down the end phase
* @param a pointer to an animation
* @return the current value to set
*/
int32_t lv_anim_path_ease_out(const lv_anim_t * a);
/**
* Calculate the current value of an animation applying an "S" characteristic (cosine)