#include?“DrawQWidget.h“
#include?
#include?
DrawQWidget::DrawQWidget（QWidget?*parent）?:?QWidget（parent）
{
????setAttribute（Qt::WA_styledBackground）;
????setstyleSheet（“background-color:?rgb（0?0?0）;“）;
????grabKeyboard（）;
????setMouseTracking（true）;

????m_difference_x????????????????=?0;
????m_difference_y????????????????=?0;
????draw_shap?????????????????????=?DRAW_NO;
????painter???????????????????????=?new?QPainter（this）;
????frame_pen?????????????????????=?QPen（QColor（0174255）2）;
????red_point_pen?????????????????=?QPen（QColor（25500）4）;
????is_mouse_pressed??????????????=?false;
????timer_id?=?startTimer（20）;


????rect_init_region（）;
????ellipse_init_region（）;
????///?開啟鼠標實時追蹤
????setMouseTracking（true）;

}

DrawQWidget::~DrawQWidget（）
{
????killTimer（timer_id）;
}


/*?Event?function
?*
?*/
void?DrawQWidget::timerEvent（QTimerEvent?*）
{
????this->update（）;
}
void?DrawQWidget::paintEvent（QPaintEvent?*）
{
????painter->begin（this）;
????painter->drawImage（QRectF（00width（）height（））?picture_image）;
????switch?（draw_shap）?{
????case?（DRAW_RECT）?????:{
????????painter->setPen（frame_pen）;//繪制邊框線
????????painter->drawRect（QRect（rect_left?rect_top?rect_width?rect_height））;
????????painter->setPen（red_point_pen）;//繪制八個點
????????painter->drawPoints（rect_polygon）;
????????}break;
????case?（DRAW_ELLIPSE）??:{
????????painter->setPen（frame_pen）;//繪制邊框線
????????painter->drawEllipse（QRect（ellipse_left?ellipse_top?ellipse_width?ellipse_height））;
????????painter->setPen（red_point_pen）;//繪制四個點
????????painter->drawPoints（ellipse_polygon）;
????????}break;
????case?（DRAW_NO）???????:break;
????}

????painter->end（）;
}

void?DrawQWidget::mousePressEvent（QMouseEvent?*event）
{
//????if?（!is_start_draw）?return;
????is_mouse_pressed?=?true;
}

void?DrawQWidget::mouseMoveEvent（QMouseEvent?*event）
{
//????if?（!is_start_draw）?return;
????new_mouse_pos?=?event->pos（）;
????if?（is_mouse_pressed）?{
????????m_difference_x?=?new_mouse_pos.x（）?-?old_mouse_pos.x（）;
????????m_difference_y?=?new_mouse_pos.y（）?-?old_mouse_pos.y（）;
????????switch?（draw_shap）?{
????????case?（DRAW_RECT）?????:rect_change_region（）;break;
????????case?（DRAW_ELLIPSE）??:ellipse_change_region（）;break;
????????case?（DRAW_NO）???????:break;
????????}
????}else{
????????switch?（draw_shap）?{
????????case?（DRAW_RECT）?????:rect_mouse_pos?=?rect_get_mouse_pos（new_mouse_pos.x（）?new_mouse_pos.y（））;break;
????????case?（DRAW_ELLIPSE）??:ellipse_mouse_pos?=?ellipse_get_mouse_pos（new_mouse_pos.x（）?new_mouse_pos.y（））;break;
????????case?（DRAW_NO）???????:break;
????????}

????}

????old_mouse_pos?=?new_mouse_pos;
}

void?DrawQWidget::mouseReleaseEvent（QMouseEvent?*event）
{
//????if?（!is_start_draw）?return;
????is_mouse_pressed?=?false;
}


/*?Rect?function
?*
?*/
void?DrawQWidget::rect_init_region（）
{
????rect_left???=?100;
????rect_top????=?200;
????rect_width??=?101;
????rect_h