lv_draw_arc.h

API reference for lv_draw_arc.h

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Summary

4Functions

1Structs

Functions

draw/lv_draw_arc.h:78function

lv_draw_task_get_arc_dsc

Try to get an arc draw descriptor from a draw task.

lv_draw_arc_dsc_t * lv_draw_task_get_arc_dsc(lv_draw_task_t *task)

Name	Type	Description
`task`	`lv_draw_task_t *`	draw task

Returns: lv_draw_arc_dsc_t * — the task's draw descriptor or NULL if the task is not of type LV_DRAW_TASK_TYPE_ARC

draw/lv_draw_arc.h:98function

lv_draw_arc_get_area

Get an area the should be invalidated when the arcs angle changed between start_angle and end_ange

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)

Name	Type	Description
`x`	`int32_t`	the x coordinate of the center of the arc
`y`	`int32_t`	the y coordinate of the center of the arc
`radius`	`uint16_t`	the radius of the arc
`start_angle`	`lv_value_precise_t`	the start angle of the arc (0 deg on the bottom, 90 deg on the right)
`end_angle`	`lv_value_precise_t`	the end angle of the arc
`w`	`int32_t`	width of the arc
`rounded`	`bool`	true: the arc is rounded
`area`	`lv_area_t *`	store the area to invalidate here

Structs

struct

lv_draw_arc_dsc_t

Member	Type	Description
`base`	`lv_draw_dsc_base_t`
`color`	`lv_color_t`	The color of the arc
`width`	`int32_t`	The width (thickness) of the arc
`start_angle`	`lv_value_precise_t`	The start angle in 1 degree units (if `LV_USE_FLOAT` is enabled a float number can be also used) 0° is the 3 o'clock position, 90° is the 6 o'clock, etc.
`end_angle`	`lv_value_precise_t`	The end angle, similarly to start_angle.
`center`	`lv_point_t`	The center point of the arc.
`img_src`	`const void *`	An image source to be used instead of `color`. `NULL` if unused
`radius`	`uint16_t`	The outer radius of the arc
`opa`	`lv_opa_t`	Opacity of the arc in 0...255 range. LV_OPA_TRANSP, LV_OPA_10, LV_OPA_20, .. LV_OPA_COVER can be used as well
`rounded`	`uint8_t`	1: Make the arc ends rounded

Used by 10 functions

lv_obj_init_draw_arc_dsc — param draw_dsc
lv_draw_eve_arc — param dsc
lv_draw_arc_dsc_init — param dsc
lv_draw_arc — param dsc
lv_draw_nanovg_arc — param dsc
lv_draw_nema_gfx_arc — param dsc
lv_draw_dave2d_arc — param dsc
lv_draw_sdl_arc — param dsc
lv_draw_sw_arc — param dsc
lv_draw_vg_lite_arc — param dsc