152 lines
3.8 KiB
C
152 lines
3.8 KiB
C
/*
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* 程序清单：DC操作演示
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*
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* 这个例子会在创建出的view上进行DC操作的演示
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*/
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#include "demo_view.h"
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#include <rtgui/rtgui_system.h>
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#include <rtgui/widgets/label.h>
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#include <rtgui/widgets/slider.h>
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/*
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* view的事件处理函数
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*/
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rt_bool_t dc_event_handler(rtgui_widget_t* widget, rtgui_event_t *event)
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{
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/* 仅对PAINT事件进行处理 */
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if (event->type == RTGUI_EVENT_PAINT)
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{
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struct rtgui_dc* dc;
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rtgui_rect_t rect;
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rt_uint32_t vx[] = {20, 50, 60, 45, 60, 20};
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rt_uint32_t vy[] = {150, 50, 90, 60, 45, 50};
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/*
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* 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
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* 先绘图
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*/
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rtgui_view_event_handler(widget, event);
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/************************************************************************/
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/* 下面的是DC的操作 */
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/************************************************************************/
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/* 获得控件所属的DC */
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dc = rtgui_dc_begin_drawing(widget);
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/* 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） */
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if (dc == RT_NULL)
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return RT_FALSE;
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/* 获得demo view允许绘图的区域 */
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demo_view_get_rect(RTGUI_VIEW(widget), &rect);
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rtgui_dc_set_textalign(dc, RTGUI_ALIGN_BOTTOM | RTGUI_ALIGN_CENTER_HORIZONTAL);
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/* 显示GUI的版本信息 */
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#ifdef RTGUI_USING_SMALL_SIZE
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rtgui_dc_draw_text(dc, "RT-Thread/GUI小型版本", &rect);
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#else
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rtgui_dc_draw_text(dc, "RT-Thread/GUI标准版本", &rect);
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#endif
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/* 绘制一个圆形 */
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rtgui_dc_set_color(dc, red);
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rtgui_dc_draw_circle(dc, rect.x1 + 10, rect.y1 + 10, 10);
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/* 填充一个圆形 */
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rtgui_dc_set_color(dc, green);
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rtgui_dc_fill_circle(dc, rect.x1 + 30, rect.y1 + 10, 10);
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/* 画一个圆弧 */
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rtgui_dc_set_color(dc, RTGUI_RGB(250, 120, 120));
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rtgui_dc_draw_arc(dc, rect.x1 + 120, rect.y1 + 60, 30, 0, 120);
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/* 多边形 */
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rtgui_dc_set_color(dc, blue);
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rtgui_dc_draw_polygon(dc, vx, vy, 6);
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/* 绘制不同的边框 */
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{
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rtgui_rect_t rect = {0, 0, 16, 16};
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rtgui_rect_moveto(&rect, 30, 120);
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rtgui_dc_draw_border(dc, &rect, RTGUI_BORDER_RAISE);
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rect.x1 += 20;
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rect.x2 += 20 + 50;
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rtgui_dc_draw_text(dc, "raise", &rect);
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rect.x1 -= 20;
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rect.x2 -= 20 + 50;
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rect.y1 += 20;
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rect.y2 += 20;
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rtgui_dc_draw_border(dc, &rect, RTGUI_BORDER_SIMPLE);
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rect.x1 += 20;
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rect.x2 += 20 + 50;
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rtgui_dc_draw_text(dc, "simple", &rect);
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rect.x1 -= 20;
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rect.x2 -= 20 + 50;
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rect.y1 += 20;
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rect.y2 += 20;
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rtgui_dc_draw_border(dc, &rect, RTGUI_BORDER_SUNKEN);
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rect.x1 += 20;
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rect.x2 += 20 + 50;
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rtgui_dc_draw_text(dc, "sunken", &rect);
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rect.x1 -= 20;
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rect.x2 -= 20 + 50;
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rect.y1 += 20;
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rect.y2 += 20;
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rtgui_dc_draw_border(dc, &rect, RTGUI_BORDER_BOX);
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rect.x1 += 20;
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rect.x2 += 20 + 50;
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rtgui_dc_draw_text(dc, "box", &rect);
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rect.x1 -= 20;
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rect.x2 -= 20 + 50;
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rect.y1 += 20;
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rect.y2 += 20;
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rtgui_dc_draw_border(dc, &rect, RTGUI_BORDER_STATIC);
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rect.x1 += 20;
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rect.x2 += 20 + 50;
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rtgui_dc_draw_text(dc, "static", &rect);
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rect.x1 -= 20;
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rect.x2 -= 20 + 50;
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rect.y1 += 20;
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rect.y2 += 20;
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rtgui_dc_draw_border(dc, &rect, RTGUI_BORDER_EXTRA);
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rect.x1 += 20;
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rect.x2 += 20 + 50;
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rtgui_dc_draw_text(dc, "extra", &rect);
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rect.x1 -= 20;
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rect.x2 -= 20 + 50;
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rect.y1 += 20;
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rect.y2 += 20;
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}
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/* 绘图完成 */
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rtgui_dc_end_drawing(dc);
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}
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else
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{
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/* 其他事件，调用默认的事件处理函数 */
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return rtgui_view_event_handler(widget, event);
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}
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return RT_FALSE;
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}
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/* 创建用于DC操作演示用的视图 */
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rtgui_view_t *demo_view_dc(rtgui_workbench_t* workbench)
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{
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rtgui_view_t *view;
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view = demo_view(workbench, "DC Demo");
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if (view != RT_NULL)
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/* 设置成自己的事件处理函数 */
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rtgui_widget_set_event_handler(RTGUI_WIDGET(view), dc_event_handler);
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return view;
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}
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