Qt QCustomPlot在网格上设置pixamp
我尝试在QCustomPlot上添加pixamp,以下是我的代码:Qt QCustomPlot在网格上设置pixamp,qt,qpixmap,qcustomplot,Qt,Qpixmap,Qcustomplot,我尝试在QCustomPlot上添加pixamp,以下是我的代码: MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); _pixmap = new QCPItemPixmap(ui->widget); ui->widget->setInteractions(QCP::i
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow) {
ui->setupUi(this);
_pixmap = new QCPItemPixmap(ui->widget);
ui->widget->setInteractions(QCP::iRangeDrag | QCP::iRangeZoom | QCP::iSelectPlottables);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_pushButton_clicked() {
QImage image = QImage(200, 200, QImage::Format_RGB32);
int image_size = 200 * 200;
QRgb pixel;
QRgb green = qRgb(0, 255, 0);
QRgb red = qRgb(255, 0, 0);
for(int i = 0; i < image_size; i++) {
if(i % 2 == 0) {
pixel = green;
}
else {
pixel = red;
}
image.setPixel(i / 200, i % 200, pixel);
}
QPixmap pixels = QPixmap::fromImage(image.scaled(ui->widget->width(),ui->widget->height(),
Qt::IgnoreAspectRatio, Qt::FastTransformation));
_pixmap->setVisible(true);
_pixmap->setScaled(true);
_pixmap->setPixmap(pixels);
_pixmap->topLeft->setCoords(2.0, 3.0);
_pixmap->bottomRight->setCoords(5.0, 0.0);
ui->widget->replot();
}
MainWindow::MainWindow(QWidget*父项):
QMainWindow(父级),
用户界面(新用户界面::主窗口){
用户界面->设置用户界面(此);
_pixmap=新的QCPItemPixmap(ui->widget);
ui->widget->setInteractions(QCP::iRangeDrag | QCP::iRangeZoom | QCP::iSelectPlottables);
}
MainWindow::~MainWindow()
{
删除用户界面;
}
void主窗口::在按钮上单击(){
QImage image=QImage(200200,QImage::Format_RGB32);
int image_size=200*200;
QRgb像素;
QRgb绿色=QRgb(0,255,0);
QRgb红色=QRgb(255,0,0);
对于(int i=0;iwidget->width(),ui->widget->height(),
Qt::IgnoreAspectRatio,Qt::FastTransformation);
_pixmap->setVisible(真);
_pixmap->setScaled(真);
_pixmap->setPixmap(像素);
_pixmap->topLeft->setCoords(2.0,3.0);
_pixmap->bottomRight->setCoords(5.0,0.0);
ui->widget->replot();
}
pixmap应该是([2,3]、[5,3]、[5,0]、[2,0])之间的矩形,但是
我不太清楚:
为什么gap及其未设置为5.0?查看方法
void QCPItemPixmap::setScaled ( bool scaled, Qt::AspectRatioMode aspectRatioMode = Qt::KeepAspectRatio, Qt::TransformationMode transformationMode = Qt::SmoothTransformation )
您可以看到,aspectRatioMode
的默认值是Qt::keepasspectratio
将其更改为Qt::IgnoreAspectRatio
,以获得所需的结果
它看起来是这样的:
...
_pixmap->setVisible(true);
_pixmap->setScaled(true, Qt::IgnoreAspectRatio);
_pixmap->setPixmap(pixels);
...