编译环境arm+linux+qt4
现在想在qt4上画一坐标:程序代码如下:
main.cpp代码:
#include <QApplication>
#include <QDialog>
#include "ui_widget.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Ui_Widget ui;
QDialog *dialog = new QDialog;
ui.setupUi(dialog);
dialog->show();
return app.exec();
}
Widgt.h文件如下:
#define WIDGET_H
#include <QWidget>namespace Ui {
class Widget;
}
class Widget : public QWidget { Q_OBJECT
public:
Widget(QWidget *parent = 0);
~Widget();protected:
virtual void changeEvent(QEvent *e);
virtual bool eventFilter(QObject *watched, QEvent *e);
void paintOnWidget(QWidget *w);
private:
Ui::Widget *ui;};
Widget.cpp文件如下:
#include "Widget.h"#include "ui_Widget.h"
#include <QtGui/QPainter>
Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget) { ui->setupUi(this);
this->installEventFilter(this);
}
Widget::~Widget() { delete ui;
}
void Widget::changeEvent(QEvent *e) { QWidget::changeEvent(e);
switch (e->type()) { case QEvent::LanguageChange:
ui->retranslateUi(this); break;
default: break;
}}
bool Widget::eventFilter(QObject *watched, QEvent *e) {
if (watched == this) {
if (e->type() == QEvent::Paint) {
paintOnWidget(this);
return true;
}
}
return QWidget::eventFilter(watched, e);
}
void Widget::paintOnWidget(QWidget *w) {
QPainter painter(w);
QFontMetrics metrics = painter.fontMetrics(); int textHeight = metrics.ascent() + metrics.descent();
int leftWidth = metrics.width(tr("9000")) + 5;
int rightWidth = metrics.width(tr("(日)")); int width = w->size().width() - leftWidth - rightWidth;
int height = w->size().height() - 3 * textHeight;
// 绘制外框 painter.drawRect(0, 0, w->size().width() -1, w->size().height() - 1);
// 移动坐标系 //painter.translate(inset * 2, ui->yearWidget->size().height() - inset);
painter.translate(leftWidth, 1.75 * textHeight + height);
int totalCount = 9000; // 默认每年收入9000件衣服 int count = 10; // 分成10成
float deltaX = width / 12.0f; // x坐标上每分的宽度 float deltaY = (float)height / count; // y坐标上每分的宽度
// 画横坐标
painter.drawLine(0, 0, width, 0); for (int i = 1; i <= 12; ++i) {
QString month = tr("%1月").arg(i); int stringWidth = metrics.width(month);
// 绘制坐标刻度
painter.drawLine(deltaX * i, 0, deltaX * i, 4);
// 绘制坐标处的月 int monthX = deltaX * (i - 1) + ((deltaX - stringWidth) / 2);
painter.drawText(monthX, textHeight, month); }
// 画纵坐标
painter.drawLine(0, 0, 0, -height); painter.drawText(-metrics.width(tr("(件)")),
-(deltaY * count + textHeight / 2 + metrics.descent()), tr("(件)"));
for (int i = 1; i <= count; ++i) { QString value = QString("%1").arg(i * totalCount / count);
int stringWidth = metrics.width(value);
// 绘制坐标刻度 painter.drawLine(-4, -i * deltaY, 0, -i * deltaY);
// 绘制坐标值
//painter.drawText(-stringWidth - 4, -i * deltaY + stringHeight / 2, value); painter.drawText(-stringWidth - 4, -(deltaY * i + textHeight / 2 - metrics.ascent()), value);
}
// // 绘制每个月收到的服饰 // painter.setBrush(Qt::BDiagPattern);
// for (int i = 0; i < yearList.size(); ++i) { // painter.setPen(Qt::black);
// int fineryCount = yearList.at(i); // 第i + 1个月收到的服饰件数 // int h = fineryCount / (float)totalCount * height;
// painter.drawRect(deltaX * i + 2, 0, deltaX - 4, -h); //
// // 绘制收到的服饰件数 // QString fineryString = QString("%1").arg(fineryCount);
// int stringWidth = metrics.width(fineryString); //
// if (h > height) { // h = height;
// } //
// painter.setPen(Qt::red); // //painter.drawText(deltaX * i + (deltaX - stringWidth) / 2, -(h + metrics.descent()), fineryString);
// }}
编译之后没有报错误,但是运行之后,并没有显示坐标。不知道什么原因。往大侠指教。谢谢