littlevgl lv_gauge仪表盘指针的长度怎么改，

汤焰

littlevgl  lv_gauge仪表盘指针的长度怎么改，

bs1234

这个改不了，跟底盘变大变小的

汤焰

知道了，只能改底盘

sniper_15

修改static void lv_gauge_draw_needle()函数

1. 
   
2. static void lv_gauge_draw_needle(lv_obj_t * gauge, const lv_area_t * clip_area)
   
3. {lv_style_int_t pad = lv_obj_get_style_pad_inner(dial, LV_DIAL_PART_NEEDLE);
   
4. lv_style_int_t left = lv_obj_get_style_pad_left(dial, LV_DIAL_PART_MAIN);
   
5. lv_style_int_t right = lv_obj_get_style_pad_right(dial, LV_DIAL_PART_MAIN);
   
6. lv_style_int_t top = lv_obj_get_style_pad_top(dial, LV_DIAL_PART_MAIN);
   
7. 
   
8. lv_coord_t r = (lv_obj_get_width(dial) - left - right) / 2 - pad;
   
9. lv_coord_t r_needle[3];     //三根指针长度不一，各自分开储存   //----- 增加 - By XXX 20201116
   
10. for (uint8_t needle_id = 0; needle_id < 3; needle_id++) //将 needle_pad[3] 代入计算   //----- 增加 - By XXX 20201116
    
11. {
    
12.     r_needle[needle_id] = (lv_obj_get_width(dial) - left - right) / 2 - needle_pad[needle_id];
    
13. }
    
14. lv_coord_t x_ofs = dial->coords.x1 + r + left + pad;
    
15. lv_coord_t y_ofs = dial->coords.y1 + r + top + pad;
    
16. uint16_t angle = lv_linemeter_get_scale_angle(dial);
    
17. int16_t angle_ofs = 90 + (360 - angle) / 2 + lv_dial_get_angle_offset(dial);
    
18. int16_t min = lv_dial_get_min_value(dial);
    
19. int16_t max = lv_dial_get_max_value(dial);
    
20. lv_point_t p_mid;
    
21. lv_point_t p_end;
    
22. uint8_t i;
    
23. 
    
24. lv_draw_line_dsc_t line_dsc;
    
25. lv_draw_img_dsc_t img_dsc;
    
26. if (ext->needle_img == NULL) {
    
27.     lv_draw_line_dsc_init(&line_dsc);
    
28.     lv_obj_init_draw_line_dsc(dial, LV_DIAL_PART_NEEDLE, &line_dsc);
    
29. }
    
30. else {
    
31.     lv_draw_img_dsc_init(&img_dsc);
    
32.     lv_obj_init_draw_img_dsc(dial, LV_DIAL_PART_NEEDLE, &img_dsc);
    
33. }
    
34. 
    
35. p_mid.x = x_ofs;
    
36. p_mid.y = y_ofs;
    
37. for (i = 0; i < ext->needle_count; i++) {
    
38.     /*Calculate the end point of a needle*/
    
39.     int16_t needle_angle =
    
40.         (ext->values[i] - min) * angle / (max - min) + angle_ofs;
    
41. 
    
42.     /*Draw line*/
    
43.     if (ext->needle_img == NULL) {
    
44.         //p_end.y = (_lv_trigo_sin(needle_angle) * r) / LV_TRIGO_SIN_MAX + y_ofs;
    
45.         //p_end.x = (_lv_trigo_sin(needle_angle + 90) * r) / LV_TRIGO_SIN_MAX + x_ofs;
    
46.         p_end.y = (_lv_trigo_sin(needle_angle) * r_needle[i]) / LV_TRIGO_SIN_MAX + y_ofs;   //----- 修改 - By XXX 20201116
    
47.         p_end.x = (_lv_trigo_sin(needle_angle + 90) * r_needle[i]) / LV_TRIGO_SIN_MAX + x_ofs;   //----- 修改 - By XXX 20201116
    
48. 
    
49.         /*Draw the needle with the corresponding color*/
    
50.         if (ext->needle_colors != NULL) line_dsc.color = ext->needle_colors[i];
    
51. 
    
52.         line_dsc.width = needle_width[i];   //三根指针不同宽度  //----- 增加 - By XXX 20201116
    
53.         lv_draw_line(&p_mid, &p_end, clip_area, &line_dsc);
    
54.     }
    
55.     /*Draw image*/
    
56.     else {
    
57.         lv_img_header_t info;
    
58.         //lv_img_decoder_get_info(ext->needle_img, &info);
    
59.         lv_img_decoder_get_info(needle_img[i], &info);    //三根指针不同图片  //----- 修改 - By
    
60. 
    
61.         lv_area_t a;
    
62.         //a.x1 = dial->coords.x1 + lv_area_get_width(&dial->coords) / 2 - ext->needle_img_pivot.x;
    
63.         //a.y1 = dial->coords.y1 + lv_area_get_height(&dial->coords) / 2 - ext->needle_img_pivot.y;
    
64.         a.x1 = dial->coords.x1 + lv_area_get_width(&dial->coords) / 2 - needle_img_pivot[i].x;    //----- 修改 - By XXX  20201126
    
65.         a.y1 = dial->coords.y1 + lv_area_get_height(&dial->coords) / 2 - needle_img_pivot[i].y;   //----- 修改 - By XXX  20201126
    
66.         a.x2 = a.x1 + info.w - 1;
    
67.         a.y2 = a.y1 + info.h - 1;
    
68.         //img_dsc.pivot.x = ext->needle_img_pivot.x;
    
69.         //img_dsc.pivot.y = ext->needle_img_pivot.y;
    
70.         img_dsc.pivot.x = needle_img_pivot[i].x;  //----- 修改 - By XXX 20201126
    
71.         img_dsc.pivot.y = needle_img_pivot[i].y;  //----- 修改 - By XXX 20201126
    
72. 
    
73.         if (ext->needle_colors != NULL) img_dsc.recolor = ext->needle_colors[i];
    
74. 
    
75.         needle_angle = (needle_angle * 10);
    
76.         if (needle_angle > 3600) needle_angle -= 3600;
    
77.         img_dsc.angle = needle_angle;
    
78.         //lv_draw_img(&a, clip_area, ext->needle_img, &img_dsc);
    
79.         lv_draw_img(&a, clip_area, needle_img[i], &img_dsc);  //----- 修改 - By XXX 20201126
    
80.     }
    
81. }
    
82. 
    
83. lv_draw_rect_dsc_t mid_dsc;
    
84. lv_draw_rect_dsc_init(&mid_dsc);
    
85. lv_obj_init_draw_rect_dsc(dial, LV_DIAL_PART_NEEDLE, &mid_dsc);
    
86. lv_style_int_t size = lv_obj_get_style_size(dial, LV_DIAL_PART_NEEDLE) / 2;
    
87. lv_area_t nm_cord;
    
88. nm_cord.x1 = x_ofs - size;
    
89. nm_cord.y1 = y_ofs - size;
    
90. nm_cord.x2 = x_ofs + size;
    
91. nm_cord.y2 = y_ofs + size;
    
92. lv_draw_rect(&nm_cord, clip_area, &mid_dsc);

复制代码

汤焰

sniper_15 发表于 2021-1-8 11:42
修改static void lv_gauge_draw_needle()函数

Draw image 这里我用3张图片替换 显示没有出来，  
Draw line这里用线倒是有显示3跟线，三根长度是有不同

大佬 方便提供下模拟器的代码吗？ 我用你贴的代码 gauge没有显示
有几个还不清楚
lv_style_int_t needle_width[3];
lv_coord_t needle_pad[3];
lv_point_t needle_img_pivot[3];

欧福

最近我也在弄这种界面

tianxiazone

indic = lv_meter_add_needle_line(meter, scale, 5, lv_palette_main(LV_PALETTE_RED), 0);//创建一个指针  （父类，子类，指针的宽度，指针的颜色，指针的长度）
我用的是  LVGL 8.1 版本