124 lines
3.5 KiB
C
124 lines
3.5 KiB
C
#include "../lv_examples.h"
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#if LV_BUILD_EXAMPLES && LV_USE_LABEL
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#if LV_USE_DRAW_SW_COMPLEX_GRADIENTS
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static void position_bullet(lv_event_t * e, lv_point_t * p)
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{
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lv_indev_t * indev = lv_event_get_param(e);
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lv_indev_get_point(indev, p);
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lv_obj_t * bullet = lv_event_get_target(e);
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lv_obj_t * parent = lv_obj_get_parent(bullet);
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p->x -= lv_obj_get_x(parent);
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p->y -= lv_obj_get_y(parent);
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int32_t w = lv_obj_get_width(parent);
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int32_t h = lv_obj_get_height(parent);
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lv_obj_set_pos(bullet, LV_CLAMP(5, p->x, w - 20), LV_CLAMP(5, p->y, h - 20));
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}
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static void start_event_cb(lv_event_t * e)
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{
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lv_style_t * style = lv_event_get_user_data(e);
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lv_style_value_t v;
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lv_style_get_prop(style, LV_STYLE_BG_GRAD, &v);
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lv_grad_dsc_t * dsc = (lv_grad_dsc_t *)v.ptr;
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lv_point_t p;
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position_bullet(e, &p);
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lv_obj_t * bullet = lv_event_get_target(e);
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lv_obj_t * parent = lv_obj_get_parent(bullet);
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p.x -= lv_obj_get_width(parent) / 2;
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p.y -= lv_obj_get_height(parent) / 2;
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dsc->params.conical.start_angle = lv_atan2(p.y, p.x);
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lv_obj_invalidate(parent);
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}
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static void end_event_cb(lv_event_t * e)
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{
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lv_style_t * style = lv_event_get_user_data(e);
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lv_style_value_t v;
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lv_style_get_prop(style, LV_STYLE_BG_GRAD, &v);
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lv_grad_dsc_t * dsc = (lv_grad_dsc_t *)v.ptr;
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lv_point_t p;
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position_bullet(e, &p);
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lv_obj_t * bullet = lv_event_get_target(e);
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lv_obj_t * parent = lv_obj_get_parent(bullet);
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p.x -= lv_obj_get_width(parent) / 2;
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p.y -= lv_obj_get_height(parent) / 2;
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dsc->params.conical.end_angle = lv_atan2(p.y, p.x);
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lv_obj_invalidate(parent);
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}
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/**
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* Play with the conical gradient
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*/
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void lv_example_grad_4(void)
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{
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static const lv_color_t grad_colors[2] = {
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LV_COLOR_MAKE(0xff, 0x00, 0x00),
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LV_COLOR_MAKE(0x00, 0xff, 0x00),
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};
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static const lv_opa_t grad_opa[2] = {
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LV_OPA_100,
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LV_OPA_0,
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};
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static lv_style_t style;
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lv_style_init(&style);
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/*First define a color gradient. In this example we use a purple to black color map.*/
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static lv_grad_dsc_t grad;
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lv_grad_init_stops(&grad, grad_colors, grad_opa, NULL, sizeof(grad_colors) / sizeof(lv_color_t));
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lv_grad_conical_init(&grad, lv_pct(50), lv_pct(50), 0, 180, LV_GRAD_EXTEND_PAD);
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/*Set gradient as background*/
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lv_style_set_bg_grad(&style, &grad);
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lv_style_set_border_width(&style, 2);
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lv_style_set_pad_all(&style, 0);
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lv_style_set_radius(&style, 12);
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/*Create an object with the new style*/
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lv_obj_t * obj = lv_obj_create(lv_screen_active());
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lv_obj_add_style(obj, &style, 0);
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lv_obj_set_size(obj, lv_pct(80), lv_pct(80));
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lv_obj_center(obj);
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lv_obj_t * start = lv_button_create(obj);
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lv_obj_set_size(start, 15, 15);
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lv_obj_set_style_bg_color(start, lv_color_hex(0x0000ff), 0);
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lv_obj_add_event_cb(start, start_event_cb, LV_EVENT_PRESSING, &style);
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lv_obj_set_ext_click_area(start, 5);
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lv_obj_set_pos(start, lv_pct(80), lv_pct(50));
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lv_obj_t * end = lv_button_create(obj);
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lv_obj_set_size(end, 15, 15);
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lv_obj_set_style_bg_color(end, lv_color_hex(0x00ffff), 0);
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lv_obj_add_event_cb(end, end_event_cb, LV_EVENT_PRESSING, &style);
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lv_obj_set_ext_click_area(end, 5);
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lv_obj_set_pos(end, lv_pct(20), lv_pct(50));
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}
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#else
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void lv_example_grad_4(void)
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{
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lv_obj_t * label = lv_label_create(lv_screen_active());
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lv_label_set_text(label, "LV_USE_DRAW_SW_COMPLEX_GRADIENTS needs to be enabled");
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lv_obj_center(label);
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}
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#endif /*LV_USE_DRAW_SW_COMPLEX_GRADIENTS*/
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#endif
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