rt-thread/examples/gui/demo_view_dc.c

#include "demo_view.h"
#include <rtgui/rtgui_system.h>
#include <rtgui/widgets/label.h>
#include <rtgui/widgets/slider.h>

rt_bool_t dc_event_handler(rtgui_widget_t* widget, rtgui_event_t *event)
{
	if (event->type == RTGUI_EVENT_PAINT)
	{
		struct rtgui_dc* dc;
		rtgui_rect_t rect;
		rt_uint32_t vx[] = {20, 50, 60, 45, 60, 20};
		rt_uint32_t vy[] = {150, 50, 90, 60, 45, 50};

		/* <20><>Ϊ<EFBFBD>õ<EFBFBD><C3B5><EFBFBD>demo view<65><77><EFBFBD><EFBFBD><EFBFBD>汾<EFBFBD><E6B1BE><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD>ֿؼ<D6BF><D8BC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڻ<EFBFBD>ͼʱ<CDBC><CAB1>Ҫ<EFBFBD><D2AA>demo view<65>Ȼ<EFBFBD>ͼ */
		rtgui_view_event_handler(widget, event);

		/************************************************************************/
		/* <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>DC<44>Ĵ<EFBFBD><C4B4><EFBFBD>                                             */
		/************************************************************************/

		/* <20><><EFBFBD>ÿؼ<C3BF><D8BC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>DC */
		dc = rtgui_dc_begin_drawing(widget);
		if (dc == RT_NULL) /* <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>DC<44><43><EFBFBD><EFBFBD><EFBFBD>أ<EFBFBD><D8A3><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ؼ<EFBFBD><D8BC>򸸿ؼ<F2B8B8BF><D8BC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>״̬<D7B4><CCAC>DC<44>ǻ<EFBFBD>ȡ<EFBFBD><C8A1><EFBFBD>ɹ<EFBFBD><C9B9>ģ<EFBFBD> */
			return RT_FALSE;

		/* <20><><EFBFBD><EFBFBD>demo view<65><77><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͼ<EFBFBD><CDBC><EFBFBD><EFBFBD><EFBFBD><EFBFBD> */
		demo_view_get_rect(RTGUI_VIEW(widget), &rect);

		/* <20><><EFBFBD><EFBFBD>һ<EFBFBD><D2BB>Բ<EFBFBD><D4B2> */
		rtgui_dc_set_color(dc, red);
		rtgui_dc_draw_circle(dc, rect.x1 + 10, rect.y1 + 10, 10);

		/* <20><><EFBFBD><EFBFBD>һ<EFBFBD><D2BB>Բ<EFBFBD><D4B2> */
		rtgui_dc_set_color(dc, green);
		rtgui_dc_fill_circle(dc, rect.x1 + 30, rect.y1 + 10, 10);

		/* <20><>һ<EFBFBD><D2BB>Բ<EFBFBD><D4B2> */ 
		rtgui_dc_set_color(dc, RTGUI_RGB(250, 120, 120));
		rtgui_dc_draw_arc(dc, rect.x1 + 120, rect.y1 + 60, 30, 0, 120);

		/* <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> */
		rtgui_dc_set_color(dc, blue);
		rtgui_dc_draw_polygon(dc, vx, vy, 6);

		/* <20><>ͼ<EFBFBD><CDBC><EFBFBD><EFBFBD> */
		rtgui_dc_end_drawing(dc);
	}
	else
	{
		/* <20><><EFBFBD><EFBFBD>Ĭ<EFBFBD>ϵ<EFBFBD><CFB5>¼<EFBFBD><C2BC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> */
		return rtgui_view_event_handler(widget, event);
	}

	return RT_FALSE;
}

rtgui_view_t *demo_view_dc(rtgui_workbench_t* workbench)
{
	rtgui_view_t *view;

	view = demo_view(workbench, "DC Demo");
	if (view != RT_NULL)
		rtgui_widget_set_event_handler(RTGUI_WIDGET(view), dc_event_handler);

	return view;
}