draw_qwidget.zip

#include "DrawQWidget.h" #include <qdebug.h> #include <qpainter.h> 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(0,174,255),2); red_point_pen = QPen(QColor(255,0,0),4); is_mouse_pressed = false; timer_id = startTimer(20); rect_init_region(); ellipse_init_region(); /// 开启鼠标实时追踪 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(0,0,width(),height()), picture_image); switch (draw_shap) { case (DRAW_RECT) :{ painter->setPen(frame_pen);//绘制边框线 painter->drawRect(QRect(rect_left, rect_top, rect_width, rect_height)); painter->setPen(red_point_pen);//绘制八个点 painter->drawPoints(rect_polygon); }break; case (DRAW_ELLIPSE) :{ painter->setPen(frame_pen);//绘制边框线 painter->drawEllipse(QRect(ellipse_left, ellipse_top, ellipse_width, ellipse_height)); painter->setPen(red_point_pen);//绘制四个点 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_height = 101; rect_mouse_pos = RECT_OUTSIDE; rect_update_region(); } void DrawQWidget::rect_update_region() { rect_top_left_x = rect_left; rect_top_left_y = rect_top; rect_top_right_x = rect_left+rect_width; rect_top_right_y = rect_top; rect_low_left_x = rect_left; rect_low_left_y = rect_top+rect_height; rect_low_right_x = rect_left+rect_width; rect_low_right_y = rect_top+rect_height; int Middle_X = rect_left + (rect_width>>1); int Middle_Y = rect_top + (rect_height>>1); rect_polygon.clear(); rect_polygon<<QPoint(Middle_X, rect_top) //上中 <<QPoint(rect_top_right_x, Middle_Y) //右中 <<QPoint(Middle_X, rect_low_left_y) //下中 <<QPoint(rect_left, Middle_Y) //左中 <<QPoint(rect_left, rect_top) //左上角 <<QPoint(rect_top_right_x, rect_top) //右上角 <<QPoint(rect_top_right_x, rect_low_left_y) //右下角 <<QPoint(rect_left, rect_low_left_y); //左下角 } void DrawQWidget::rect_change_region() { switch (rect_mouse_pos) { case (RECT_UPPER): rect_top += m_difference_y; rect_height -= m_difference_y;break;//上边界 case (RECT_LOWER): rect_height += m_difference_y;break; //下边界 case (RECT_LEFT) : rect_left += m_difference_x; rect_width -= m_difference_x;break;//左边界 case (RECT_RIGHT): rect_width += m_difference_x;break; //右边界 case (RECT_LEFTUPPER) : {//左上角 rect_top += m_difference_y; rect_height -= m_difference_y; rect_left += m_difference_x; rect_width -= m_difference_x; }break; case (RECT_LEFTLOWER) : {//左下角 rect_height += m_difference_y; rect_left += m_difference_x; rect_width -= m_difference_x; }break; case (RECT_RIGHTLOWER) : {//右下角 rect_height += m_difference_y; rect_width += m_difference_x; }break; case (RECT_RIGHTUPPER) : {//右上角 rect_top += m_difference_y; rect_height -= m_difference_y; rect_width += m_difference_x; }break; case (RECT_INSIDE) : {//内部 rect_top += m_difference_y;rect_left += m_difference_x; }break; case (RECT_OUTSIDE) : return;//外部 } rect_update_region(); } RECT_MOUSE_POSITION_E DrawQWidget::rect_get_mouse_pos(int pos_x, int pos_y) { if (pos_x < rect_top_left_x || pos_x > rect_top_right_x || pos_y < rect_top_left_y || pos_y > rect_low_left_y) { this->setCursor(QCursor(Qt::ArrowCursor)); return RECT_OUTSIDE; }else if (pos_y <= rect_top_left_y+BoundaryRange){ //1:左上角 2:右上角 3:上边缘 if (pos_x <= rect_top_left_x+BoundaryRange) {this->setCursor(QCursor(Qt::SizeFDiagCursor));return RECT_LEFTUPPER;} else if (pos_x >= rect_top_right_x-BoundaryRange){this->setCursor(QCursor(Qt::SizeBDiagCursor));return RECT_RIGHTUPPER;} else {this->setCursor(QCursor(Qt::SizeVerCursor)); return RECT_UPPER;} }else if (pos_y >= rect_low_left_y-BoundaryRange){ //1:左下角 2:右下角 3:下边缘 if (pos_x <= rect_low_left_x+BoundaryRange) {this->setCursor(QCursor(Qt::SizeBDiagCursor));return RECT_LEFTLOWER;} else if (pos_x >= rect_low_right_x-BoundaryRange){this->setCursor(QCursor(Qt::SizeFDiagCursor));return RECT_RIGHTLOWER;} else {this->setCursor(QCursor(Qt::SizeVerCursor)); return RECT_LOWER;} }else if (pos_x <= rect_top_left_x+BoundaryRange) { //左边缘 this->setCursor(QCursor(Qt::SizeHorCursor)); return RECT_LEFT; }else if (pos_x >= rect_top_right_x-BoundaryRange) { //右边缘 this->setCursor(QCursor(Qt::SizeHorCursor)); return RECT_RIGHT; }else { this->setCursor(QCursor(Qt::SizeAllCursor)); return RECT_INSIDE; } } /* Ellipse function * */ void DrawQWidget::ellipse_init_region() { ellipse_left = 100; ellipse_top = 200; ellipse_width = 101; ellipse_height = 101; ellipse_mouse_pos = ELLIPSE_OUTSIDE; ellipse_update_region(); } void DrawQWidget::ellipse_update_region() { ellipse_middle_x = ellipse_left + (ellipse_width>>1); ellipse_middle_y = ellipse_top + (ellipse_height>>1); ellipse_polygon.clear(); ellipse_polygon<<QPoint(ellipse_middle_x, ellipse_top) //上顶角 <<QPoint(ellipse_left+ellipse_width, ellipse_middle_y) //右顶角 <<QPoint(ellipse_middle_x, ellipse_top+ellipse_height) //下顶角 <<QPoint(ellipse_left, ellipse_middle_y); //左顶角 } void DrawQWidget::ellipse_change_region() { switch (ellipse_mouse_pos) { case (ELLIPSE_UP