QT-绘制ROI、矩形框、椭圆框，机器视觉
#ifndef DRAWQWIDGET_H
#define DRAWQWIDGET_H
#include
#include
#include
#include
/*
*
*/
typedef enum draw_shap_e{
DRAW_RECT, //画矩形
DRAW_ELLIPSE, //画椭圆
DRAW_NO //不画
}DRAW_SHAP_E;
/* 用来表示鼠标在矩形区域的位置信息
*
*/
typedef enum rect_mouse_position_e{
RECT_UPPER=0, //上边缘
RECT_LOWER=1, //下边缘
RECT_LEFT, //左边缘
RECT_RIGHT, //右边缘
RECT_LEFTUPPER, //左上角
RECT_LEFTLOWER, //左下角
RECT_RIGHTLOWER, //右下角
RECT_RIGHTUPPER, //右上角
RECT_INSIDE, //区域内部
RECT_OUTSIDE //区域外部
}RECT_MOUSE_POSITION_E;
/* 用来表示鼠标在椭圆区域的位置信息
*
*/
typedef enum ellipse_mouse_position_e{
ELLIPSE_UPPER=0, //上顶角
ELLIPSE_LOWER=1, //下顶角
ELLIPSE_LEFT, //左顶角
ELLIPSE_RIGHT, //右顶角
ELLIPSE_INSIDE, //区域内部
ELLIPSE_OUTSIDE //区域外部
}ELLIPSE_MOUSE_POSITION_E;
class DrawQWidget : public QWidget
{
Q_OBJECT
public:
explicit DrawQWidget(QWidget *parent = 0);
~DrawQWidget();
void set_draw_shap(DRAW_SHAP_E d);
void set_picture_image(QString file_name);
protected:
void timerEvent(QTimerEvent*);
void paintEvent(QPaintEvent*) override;
void mousePressEvent(QMouseEvent *event);
void mouseMoveEvent(QMouseEvent *event);
void mouseReleaseEvent(QMouseEvent *event);
private:
bool is_mouse_pressed;//是否按下鼠标
DRAW_SHAP_E draw_shap;
QPoint new_mouse_pos;
QPoint old_mouse_pos;
int m_difference_x;
int m_difference_y;
QPainter *painter; //用来绘制图像
QPen frame_pen; //用来绘制区域边框
QPen red_point_pen; //用来绘制红色点
const int BoundaryRange = 6;//用来表示边界的宽度范围，用于拖拽
/* 矩形区域相关变量和函数
* 注意:QPoint的0点是左上角，横向向右为X的正方向，竖向向下为Y的正方向
*/
int rect_left; //表示矩形右上角的X坐标
int rect_top; //表示矩形右上角的Y坐标
int rect_width; //表示矩形的宽(即水平长度)
int rect_height; //表示矩形的高(即垂直长度)
int rect_top_left_x, rect_top_left_y; //左上
int rect_top_right_x, rect_top_right_y; //右上
int rect_low_left_x, rect_low_left_y; //左下
int rect_low_right_x, rect_low_right_y; //右下
QPolygon rect_polygon; //装载8个红点的坐标
RECT_MOUSE_POSITION_E rect_mouse_pos;
void rect_init_region();
void rect_update_region();
void rect_change_region();
RECT_MOUSE_POSITION_E rect_get_mouse_pos(int pos_x, int pos_y);
/* 椭圆区域相关变量和函数
* 注意:drawEllipse(20,20,210,160);
* 第1，2个参数表示圆/椭圆距屏幕左上角的像素数，第3,4个参数表示圆/椭圆的宽度和高度。
* 更加确切地表述，这个圆或椭圆是在矩形中，这个矩形的左上角的顶点在坐标轴中的位置为（20，20），
* 这个圆或椭圆的中心为这个矩形的中心
*/
int ellipse_left; //表示椭圆右上角的X坐标
int ellipse_top; //表示椭圆右上角的Y坐标
int ellipse_width; //表示椭圆的宽(即水平长度)
int ellipse_height; //表示椭圆的高(即垂直长度)
int ellipse_middle_x;
int ellipse_middle_y;
QPolygon ellipse_polygon; //装载4个红点的坐标
ELLIPSE_MOUSE_POSITION_E ellipse_mouse_pos;
void ellipse_init_region();
void ellipse_update_region();
void ellipse_change_region();
ELLIPSE_MOUSE_POSITION_E ellipse_get_mouse_pos(int pos_x, int pos_y);
/* other
*
*/
int timer_id;
QImage picture_image;
int picture_image_w;
int picture_image_h;
public slots:
};
#endif // DRAWQWIDGET_H #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(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< 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< (ellipse_left+ellipse_width) || pos_y < ellipse_top || pos_y > (ellipse_top+ellipse_height)) {
this->setCursor(QCursor(Qt::ArrowCursor));
return ELLIPSE_OUTSIDE;
}else if (pos_y <= ellipse_top+BoundaryRange){ //上顶角
if (pos_x >= (ellipse_middle_x-3) && pos_x <= (ellipse_middle_x+3)){
this->setCursor(QCursor(Qt::SizeVerCursor)); return ELLIPSE_UPPER;
}else{
this->setCursor(QCursor(Qt::SizeAllCursor)); return ELLIPSE_INSIDE;
}
}else if (pos_y >= ellipse_top+ellipse_height-BoundaryRange){ //下顶角
if (pos_x >= (ellipse_middle_x-3) && pos_x <= (ellipse_middle_x+3)) {
this->setCursor(QCursor(Qt::SizeVerCursor)); return ELLIPSE_LOWER;
}else{
this->setCursor(QCursor(Qt::SizeAllCursor)); return ELLIPSE_INSIDE;
}
}else if (pos_x <= ellipse_left+BoundaryRange) { //左顶角
if (pos_y >= (ellipse_middle_y-3) && pos_y <= (ellipse_middle_y+3)) {
this->setCursor(QCursor(Qt::SizeHorCursor)); return ELLIPSE_LEFT;
}else{
this->setCursor(QCursor(Qt::SizeAllCursor)); return ELLIPSE_INSIDE;
}
}else if (pos_x >= ellipse_left+ellipse_width-BoundaryRange) { //右顶角
if (pos_y >= (ellipse_middle_y-3) && pos_y <= (ellipse_middle_y+3)) {
this->setCursor(QCursor(Qt::SizeHorCursor)); return ELLIPSE_RIGHT;
}else{
this->setCursor(QCursor(Qt::SizeAllCursor)); return ELLIPSE_INSIDE;
}
}else {
this->setCursor(QCursor(Qt::SizeAllCursor));
return ELLIPSE_INSIDE;
}
}
/* other function
*
*/
void DrawQWidget::set_draw_shap(DRAW_SHAP_E d)
{
draw_shap = d;
}
void DrawQWidget::set_picture_image(QString file_name)
{
QImage image_tmp;
image_tmp.load(file_name);
if (!image_tmp.isNull()){
picture_image = image_tmp;
picture_image_w = image_tmp.width();
picture_image_h = image_tmp.height();
}
} 在QWidget上绘制区域框，可以放大缩小移动，可以是矩形，也可以是椭圆，注释非常完整。
完整项目源码：CJOYdraw_qwidget.zip
没有积分的朋友可以到淘宝代理下载，只要一块钱（不限积分）