63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
#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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rt_bool_t dc_event_handler(rtgui_widget_t* widget, rtgui_event_t *event)
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{
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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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/* 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它先绘图 */
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rtgui_view_event_handler(widget, event);
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/************************************************************************/
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/* 下面的是DC的处理 */
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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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if (dc == RT_NULL) /* 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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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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/* 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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/* 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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/* 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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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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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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