rt-thread-official/examples/gui/demo_view_instrument_panel.c

/*
 * 程序清单：DC操作演示
 *
 * 这个例子会在创建出的container上进行DC操作的演示
 */

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

/*
 * container的事件处理函数
 */
rt_bool_t instrument_panel_event_handler(struct rtgui_object *object, rtgui_event_t *event)
{
	struct rtgui_widget *widget = RTGUI_WIDGET(object);
	char ac[4];
	int i;
	int x0 = 120;
	int y0 = 170;
	int x, y;
	int default_color;
	
	/* 仅对PAINT事件进行处理 */
	if (event->type == RTGUI_EVENT_PAINT)
	{
		struct rtgui_dc* dc;
		rtgui_rect_t rect;
		const int arrowx[] = {120+75, 120+75, 120+85};
		const int arrowy[] = {170-5,  170+5,  170};

		/*
		 * 因为用的是demo container，上面本身有一部分控件，所以在绘图时先要让demo container
		 * 先绘图
		 */
		rtgui_container_event_handler(RTGUI_OBJECT(widget), event);

		/************************************************************************/
		/* 下面的是DC的操作                                                     */
		/************************************************************************/

		/* 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 container允许绘图的区域 */
		demo_view_get_rect(RTGUI_CONTAINER(widget), &rect);

		RTGUI_DC_TEXTALIGN(dc) = RTGUI_ALIGN_BOTTOM | RTGUI_ALIGN_CENTER_HORIZONTAL;
		/* 显示GUI的版本信息 */
#ifdef RTGUI_USING_SMALL_SIZE
		rtgui_dc_draw_text(dc, "RT-Thread/GUI小型版本", &rect);
#else
		rtgui_dc_draw_text(dc, "RT-Thread/GUI标准版本", &rect);
#endif


	RTGUI_DC_TEXTALIGN(dc) = RTGUI_ALIGN_CENTER_VERTICAL | RTGUI_ALIGN_CENTER_HORIZONTAL;
	RTGUI_DC_FC(dc) = blue;
	rect.y2 = 270;
	rtgui_dc_draw_text(dc, "rtgui-panel", &rect);

	for(i = 0; i < 6; i++)
	{
		rtgui_dc_draw_arc(dc, x0, y0, 117-i, 150, 30);
	}

	RTGUI_DC_FC(dc) = black;

	RTGUI_DC_TEXTALIGN(dc) = RTGUI_ALIGN_LEFT;
	for(i = 0; i <= 23; i++)
	{
		if(i < 12)
		{
			x = x0 + 105 * cos((150 + i * 10) * 3.1415926 / 180);
			y = y0 + 105 * sin((150 + i * 10) * 3.1415926 / 180);
			rect.x1 = x;
			rect.y1 = y;
			rect.x2 = rect.x1 + 12 * 3;
			rect.y2 = rect.y1 + 12;
			rt_sprintf(ac, "%d", 10 * i);
			rtgui_dc_draw_text(dc, ac, &rect);	
		}
		else
		{
			RTGUI_DC_TEXTALIGN(dc) = RTGUI_ALIGN_RIGHT;
	
			x = x0 + 105 * cos((160 + i * 10) * 3.1415926 / 180);
			y = y0 + 105 * sin((160 + i * 10) * 3.1415926 / 180);

			rect.x1 = x  - 12 * 3;
			rect.y1 = y;
			rect.x2 = rect.x1 + 12 * 3;
			rect.y2 = rect.y1 + 12;
			rt_sprintf(ac, "%d", 10 * i);
			rtgui_dc_draw_text(dc, ac, &rect);
		}

		x = x0 + 107 * cos((150 + i * 10) * 3.1415926 / 180);
		y = y0 + 107 * sin((150 + i * 10) * 3.1415926 / 180);
		rtgui_dc_fill_circle(dc, x, y, 3);
	}
	RTGUI_DC_FC(dc) = RTGUI_RGB(166, 0, 166);
	rtgui_dc_fill_circle(dc, x0, y0, 3);
	RTGUI_DC_FC(dc) = RTGUI_RGB(120, 141, 30);
	rtgui_dc_draw_circle(dc, x0, y0, 5);

	default_color = RTGUI_DC_BC(dc);
	RTGUI_DC_BC(dc) = red;
	rect.x1 = x0 + 7;
	rect.y1 = y0 - 1;
	rect.x2 = x0 + 75;
	rect.y2 = y0 + 1;
	rtgui_dc_fill_rect(dc, &rect);

	RTGUI_DC_BC(dc) = default_color;

	rtgui_dc_fill_polygon(dc, arrowx, arrowy, 3);

		/* 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_container_event_handler(RTGUI_OBJECT(widget), event);
	}

	return RT_FALSE;
}

/* 创建用于DC操作演示用的视图 */
rtgui_container_t *demo_view_instrument_panel(void)
{
	rtgui_container_t *container;

	container = demo_view("instrument panel Demo");
	if (container != RT_NULL)
		/* 设置成自己的事件处理函数 */
		rtgui_object_set_event_handler(RTGUI_OBJECT(container), instrument_panel_event_handler);

	return container;
}