rt-thread/examples/gui/demo_view_dc_buffer.c

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/*
* 程序清单DC Buffer演示
*
* 这个例子会在创建出的view上进行DC Buffer的演示
*/
#include "demo_view.h"
#include <rtgui/rtgui_system.h>
#include <rtgui/widgets/label.h>
#include <rtgui/widgets/slider.h>
#include <rtgui/image.h>
static rtgui_image_t *background;
static struct rtgui_dc *dc_buffer;
/*
* view的事件处理函数
*/
static rt_bool_t dc_buffer_event_handler(rtgui_widget_t* widget, rtgui_event_t *event)
{
/* 仅对PAINT事件进行处理 */
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);
/* 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 */
if (dc == RT_NULL)
return RT_FALSE;
/* 获得demo view允许绘图的区域 */
demo_view_get_rect(RTGUI_VIEW(widget), &rect);
rect.x1 += 10;
rect.y1 += 10;
rtgui_dc_blit(dc_buffer, NULL, dc, &rect);
/* 绘图完成 */
rtgui_dc_end_drawing(dc);
}
else
{
/* 其他事件,调用默认的事件处理函数 */
return rtgui_view_event_handler(widget, event);
}
return RT_FALSE;
}
/* 创建用于DC Buffer操作演示用的视图 */
rtgui_view_t *demo_view_dc_buffer(rtgui_workbench_t* workbench)
{
rtgui_view_t *view;
if (dc_buffer == RT_NULL)
{
rtgui_rect_t rect = {0, 0, 50, 50};
/* 创建 DC Buffer长 50宽 50 */
dc_buffer = rtgui_dc_buffer_create(50, 50);
RTGUI_DC_FC(dc_buffer) = blue;
rtgui_dc_fill_rect(dc_buffer, &rect);
RTGUI_DC_FC(dc_buffer) = red;
rtgui_dc_draw_circle(dc_buffer, 25, 25, 10);
}
view = demo_view(workbench, "缓冲DC演示");
if (view != RT_NULL)
/* 设置成自己的事件处理函数 */
rtgui_widget_set_event_handler(RTGUI_WIDGET(view), dc_buffer_event_handler);
return view;
}