基于qt5.8写的一个贝塞尔曲线例子非转存Bezier curve demo

#include "mainwindow.h" #include "ui_mainwindow.h" #include "renderarea.h" #include "qgridlayout.h" #include "qrect.h" #include "beziercruve.h" #include "qvector.h" #include "qdebug.h" #include "qevent.h" #include "qdesktopwidget.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow), mouseDotCnt(0) { QGridLayout *mainLayout = new QGridLayout(this);//把renderarea画图区域加入gridlayout pMyRenderArea = new RenderArea(this); //pMyRenderArea->setFixedSize(800,600);//固定大小 pMyBezierCruve = new BezierCruve(this); mainLayout->addWidget(pMyRenderArea); QRect deskRect = get_desktop_geometry(); qDebug("desktop info, w:%d, h:%d", deskRect.width(), deskRect.height()); this->setFixedSize(deskRect.width(), deskRect.height()); pMyRenderArea->setFixedSize(deskRect.width(), deskRect.height()); ui->setupUi(this); ui->pushButton->setGeometry(deskRect.width()/7*6, deskRect.height()/16, deskRect.width()/7-10, deskRect.height()/16); connect(pMyBezierCruve, SIGNAL(signal_send_points(QVector<MY_POINT>)), pMyRenderArea, SLOT(getDotData(QVector<MY_POINT>))); connect(this, SIGNAL(signal_mouse_lbtn_pos(QPoint)), pMyRenderArea, SLOT(get_lbtn_pos(QPoint))); connect(this, SIGNAL(signal_mouse_lbtn_pos(QPoint)), this, SLOT(slot_draw_bezier(QPoint))); connect(this, SIGNAL(signal_set_desktop_geometry(QRect)), pMyRenderArea, SLOT(get_desktop_geometry(QRect))); connect(this, SIGNAL(signal_clear_all_lines()), pMyRenderArea, SLOT(clear_all_lines())); } MainWindow::~MainWindow() { delete ui; } QRect MainWindow::get_desktop_geometry() { QDesktopWidget *dwsktopwidget = QApplication::desktop(); QRect deskrect = dwsktopwidget->availableGeometry(); return deskrect; } void MainWindow::mousePressEvent(QMouseEvent *event) { if(event->button() ==Qt::LeftButton){ qDebug("鼠标 左 键按下"); QPoint lbtnPpos = event->pos(); qDebug("left button posX: %d, pos Y:%d", lbtnPpos.x(), lbtnPpos.y()); mouseDotCnt++; if(mouseDotCnt>DEF_MAX_DOTS_QTY_OF_BEZIER_CRUVE){ mouseDotCnt = 0; } testPoint[mouseDotCnt-1].x = lbtnPpos.x(); testPoint[mouseDotCnt-1].y = lbtnPpos.y(); emit signal_mouse_lbtn_pos(lbtnPpos); qDebug("mouseDotCnt: %d", mouseDotCnt); }else if(event->button()==Qt::RightButton){ qDebug("鼠标 右 键按下"); }else if(event->button()==Qt::MidButton){ qDebug("鼠标 中 键按下"); } } //bug here void MainWindow::slot_draw_bezier(QPoint) { if(mouseDotCnt>2){//鼠标捕获3点才开始画线 MY_POINT* tmpTestPoint = new MY_POINT[mouseDotCnt];//新分配n个点的测试点给贝塞尔曲线 memcpy(tmpTestPoint, testPoint, sizeof(MY_POINT)*mouseDotCnt); pMyBezierCruve->bezier_set_dot_qty(mouseDotCnt-1);//一定要实际点数减1 pMyBezierCruve->bezier_draw_cruve(tmpTestPoint); emit pMyBezierCruve->signal_send_points(pMyBezierCruve->cruveDots);//当画图完毕，pMyBezierCruve->cruveDots已经产生了 delete []tmpTestPoint; } } void MainWindow::on_pushButton_clicked() { mouseDotCnt = 0; pMyBezierCruve->cruveDots.clear(); emit signal_clear_all_lines(); }