git-svn-id: https://rt-thread.googlecode.com/svn/trunk@920 bbd45198-f89e-11dd-88c7-29a3b14d5316

examples/gui/demo_view_instrument_panel.c

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+/*
+ * 程序清单：DC操作演示
+ *
+ * 这个例子会在创建出的view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>
+
+/*
+ * view的事件处理函数
+ */
+rt_bool_t instrument_panel_event_handler(rtgui_widget_t* widget, rtgui_event_t *event)
+{
+	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 vx[] = {85, 85,  105, 105};
+		const int vy[] = {60, 100, 100, 60}; 
+		const int arrowx[] = {x0+75, x0+75, x0+85};
+		const int arrowy[] = {y0-5,  y0+5,  y0};
+
+		/*
+		 * 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);
+
+		/************************************************************************/
+		/* 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 view允许绘图的区域 */
+		demo_view_get_rect(RTGUI_VIEW(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;
+			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;
+			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_view_event_handler(widget, event);
+	}
+
+	return RT_FALSE;
+}
+
+/* 创建用于DC操作演示用的视图 */
+rtgui_view_t *demo_view_instrument_panel(rtgui_workbench_t* workbench)
+{
+	rtgui_view_t *view;
+
+	view = demo_view(workbench, "instrument panel Demo");
+	if (view != RT_NULL)
+		/* 设置成自己的事件处理函数 */
+		rtgui_widget_set_event_handler(RTGUI_WIDGET(view), instrument_panel_event_handler);
+
+	return view;
+}