1 #include "../lv_examples.h"
2 #if LV_BUILD_EXAMPLES
3
4 #if LV_USE_DRAW_SW_COMPLEX_GRADIENTS
5
6 /**
7 * Simulate metallic knob using conical gradient
8 * For best effect set LV_GRADIENT_MAX_STOPS to 8 or at least 3
9 */
lv_example_style_16(void)10 void lv_example_style_16(void)
11 {
12 #if LV_GRADIENT_MAX_STOPS >= 8
13 static const lv_color_t grad_colors[8] = {
14 LV_COLOR_MAKE(0xe8, 0xe8, 0xe8),
15 LV_COLOR_MAKE(0xff, 0xff, 0xff),
16 LV_COLOR_MAKE(0xfa, 0xfa, 0xfa),
17 LV_COLOR_MAKE(0x79, 0x79, 0x79),
18 LV_COLOR_MAKE(0x48, 0x48, 0x48),
19 LV_COLOR_MAKE(0x4b, 0x4b, 0x4b),
20 LV_COLOR_MAKE(0x70, 0x70, 0x70),
21 LV_COLOR_MAKE(0xe8, 0xe8, 0xe8),
22 };
23 #elif LV_GRADIENT_MAX_STOPS >= 3
24 static const lv_color_t grad_colors[3] = {
25 LV_COLOR_MAKE(0xe8, 0xe8, 0xe8),
26 LV_COLOR_MAKE(0xff, 0xff, 0xff),
27 LV_COLOR_MAKE(0x79, 0x79, 0x79),
28 };
29 #else
30 static const lv_color_t grad_colors[2] = {
31 LV_COLOR_MAKE(0xe8, 0xe8, 0xe8),
32 LV_COLOR_MAKE(0x79, 0x79, 0x79),
33 };
34 #endif
35
36 /*Create a style with gradient background and shadow*/
37 static lv_style_t style;
38 lv_style_init(&style);
39 lv_style_set_radius(&style, 500);
40 lv_style_set_bg_opa(&style, LV_OPA_COVER);
41 lv_style_set_shadow_color(&style, lv_color_black());
42 lv_style_set_shadow_width(&style, 50);
43 lv_style_set_shadow_offset_x(&style, 20);
44 lv_style_set_shadow_offset_y(&style, 20);
45 lv_style_set_shadow_opa(&style, LV_OPA_50);
46
47 /*First define a color gradient. In this example we use a gray color map with random values.*/
48 static lv_grad_dsc_t grad;
49
50 lv_gradient_init_stops(&grad, grad_colors, NULL, NULL, sizeof(grad_colors) / sizeof(lv_color_t));
51
52 /*Make a conical gradient with the center in the middle of the object*/
53 #if LV_GRADIENT_MAX_STOPS >= 8
54 lv_grad_conical_init(&grad, LV_GRAD_CENTER, LV_GRAD_CENTER, 0, 120, LV_GRAD_EXTEND_REFLECT);
55 #elif LV_GRADIENT_MAX_STOPS >= 3
56 lv_grad_conical_init(&grad, LV_GRAD_CENTER, LV_GRAD_CENTER, 45, 125, LV_GRAD_EXTEND_REFLECT);
57 #else
58 lv_grad_conical_init(&grad, LV_GRAD_CENTER, LV_GRAD_CENTER, 45, 110, LV_GRAD_EXTEND_REFLECT);
59 #endif
60
61 /*Set gradient as background*/
62 lv_style_set_bg_grad(&style, &grad);
63
64 /*Create an object with the new style*/
65 lv_obj_t * obj = lv_obj_create(lv_screen_active());
66 lv_obj_add_style(obj, &style, 0);
67 lv_obj_set_size(obj, 200, 200);
68 lv_obj_center(obj);
69 }
70
71 #else
72
lv_example_style_16(void)73 void lv_example_style_16(void)
74 {
75 lv_obj_t * label = lv_label_create(lv_screen_active());
76 lv_obj_set_width(label, LV_PCT(80));
77 lv_label_set_text(label, "LV_USE_DRAW_SW_COMPLEX_GRADIENTS is not enabled");
78 lv_label_set_long_mode(label, LV_LABEL_LONG_MODE_SCROLL_CIRCULAR);
79 lv_obj_center(label);
80 }
81
82 #endif /*LV_USE_DRAW_SW_COMPLEX_GRADIENTS*/
83
84 #endif /*LV_BUILD_EXAMPLES*/
85
