rt-thread-official/examples/rtgui_win/demo_gui_buffer_animation.c

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#include <rtgui/dc.h>
#include <rtgui/rtgui_system.h>
#include <rtgui/widgets/view.h>
#include "demo_view.h"
/*
* 直接在DC上绘图以实现动画效果
*
* 动画是依赖于定时器驱动的,会上下翻滚显示文字
* "飞线乱飞"
*/
static rt_int8_t dx = 1, dy = 1;
static rtgui_rect_t text_rect;
static rtgui_timer_t *timer;
static rtgui_dc_t *dc_buffer;
static void timeout(struct rtgui_timer* timer, void* parameter)
{
rtgui_dc_t* dc;
rtgui_rect_t rect;
rtgui_view_t *view;
/* 控件(view)通过parameter参数传递给定时器 */
view = (rtgui_view_t*)parameter;
/* 获得控件所属的DC */
dc = rtgui_dc_begin_drawing(view);
if (dc == RT_NULL) /* 如果不能正常获得DC返回如果控件或父控件是隐藏状态DC是获取不成功的 */
return ;
/* 获得demo view允许绘图的区域主要用于判断边界 */
rtgui_widget_get_rect(view, &rect);
rtgui_rect_inflate(&rect, -5);
rect.y1 += 35;
/* 判断是否是第一次绘图 */
if ((text_rect.x1 == 0) && (text_rect.y1 == 0))
{
rtgui_rect_moveto(&text_rect, rect.x1, rect.y1);
}
/* 设置dx和dy */
if (text_rect.x2 >= rect.x2) dx = -1;
if (text_rect.x1 < rect.x1) dx = 1;
if (text_rect.y2 >= rect.y2) dy = -1;
if (text_rect.y1 < rect.y1) dy = 1;
/* 移动文本框的位置 */
text_rect.x1 += dx; text_rect.x2 += dx;
text_rect.y1 += dy; text_rect.y2 += dy;
/* 绘图 */
rect = text_rect;
rect.x2 += 2; rect.y2 += 2;
rtgui_dc_blit(dc_buffer, NULL, dc, &rect);
/* 绘图完成 */
rtgui_dc_end_drawing(dc);
}
static rt_bool_t animation_event_handler(PVOID wdt, rtgui_event_t *event)
{
rtgui_widget_t* widget = (rtgui_widget_t*)wdt;
if (event->type == RTGUI_EVENT_PAINT)
{
struct rtgui_dc* dc;
rtgui_rect_t rect;
/* 因为用的是demo view上面本身有一部分控件所以在绘图时先要让demo view先绘图 */
rtgui_view_event_handler(widget, event);
/* 获得控件所属的DC */
dc = rtgui_dc_begin_drawing(widget);
if (dc == RT_NULL) /* 如果不能正常获得DC返回如果控件或父控件是隐藏状态DC是获取不成功的 */
return RT_FALSE;
/* 绘图 */
rect = text_rect;
rtgui_dc_blit(dc_buffer, NULL, dc, &rect);
/* 绘图完成 */
rtgui_dc_end_drawing(dc);
}
else
{
/* 调用默认的事件处理函数 */
return rtgui_view_event_handler(widget, event);
}
return RT_FALSE;
}
rtgui_view_t *demo_gui_buffer_animation(rtgui_view_t* parent_view)
{
rtgui_view_t *view;
view = demo_view_create(parent_view, "DC 缓冲区动画");
if (view != RT_NULL)
rtgui_widget_set_event_handler(view, animation_event_handler);
rtgui_font_get_metrics(RTGUI_WIDGET_FONT(view), "缓冲动画", &text_rect);
if (dc_buffer == RT_NULL)
{
rtgui_rect_t rect;
rect.x1 = 0; rect.x2 = rtgui_rect_width(text_rect) + 2;
rect.y1 = 0; rect.y2 = rtgui_rect_height(text_rect) + 2;
/* 创建 DC Buffer长 50宽 50 */
dc_buffer = rtgui_dc_buffer_create(rtgui_rect_width(rect), rtgui_rect_height(rect));
RTGUI_DC_FC(dc_buffer) = RTGUI_WIDGET_BACKGROUND(view);
rtgui_dc_fill_rect(dc_buffer, &rect);
RTGUI_DC_FC(dc_buffer) = black;
rect.x1 = 1; rect.y1 = 1;
rtgui_dc_draw_text(dc_buffer, "缓冲动画", &rect);
}
/* 启动定时器以触发动画 */
timer = rtgui_timer_create(1, RT_TIMER_FLAG_PERIODIC, timeout, view);
rtgui_timer_start(timer);
return view;
}