lv_draw_arc.h
Functions
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void lv_draw_arc_dsc_init(lv_draw_arc_dsc_t *dsc)
Initialize an arc draw descriptor.
- Parameters:
dsc -- pointer to a draw descriptor
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lv_draw_arc_dsc_t *lv_draw_task_get_arc_dsc(lv_draw_task_t *task)
Try to get an arc draw descriptor from a draw task.
- Parameters:
task -- draw task
- Returns:
the task's draw descriptor or NULL if the task is not of type LV_DRAW_TASK_TYPE_ARC
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void lv_draw_arc(lv_layer_t *layer, const lv_draw_arc_dsc_t *dsc)
Create an arc draw task.
- Parameters:
layer -- pointer to a layer
dsc -- pointer to an initialized draw descriptor variable
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void lv_draw_arc_get_area(int32_t x, int32_t y, uint16_t radius, lv_value_precise_t start_angle, lv_value_precise_t end_angle, int32_t w, bool rounded, lv_area_t *area)
Get an area the should be invalidated when the arcs angle changed between start_angle and end_ange
- Parameters:
x -- the x coordinate of the center of the arc
y -- the y coordinate of the center of the arc
radius -- the radius of the arc
start_angle -- the start angle of the arc (0 deg on the bottom, 90 deg on the right)
end_angle -- the end angle of the arc
w -- width of the arc
rounded -- true: the arc is rounded
area -- store the area to invalidate here
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struct lv_draw_arc_dsc_t
Public Members
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lv_draw_dsc_base_t base
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lv_color_t color
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int32_t width
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lv_value_precise_t start_angle
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lv_value_precise_t end_angle
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lv_point_t center
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uint16_t radius
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const void *img_src
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uint8_t rounded
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lv_draw_dsc_base_t base