在QWidget的外部进行绘制带有坐标轴的图像

kobe · 发表于 2014-7-8 14:18:03

=====================================Widget.h=====================================
#ifndef WIDGET_H
#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;
};
#endif // WIDGET_H
=====================================Widget.cpp=====================================
#include "Widget.h"
#include "ui_Widget.h"
#include <QtGui/QPainter>
Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget) {
ui->setupUi(this);
ui->widget->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 == ui->widget) {
if (e->type() == QEvent::Paint) {
paintOnWidget(ui->widget);
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);
}
}

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在QWidget的外部进行绘制带有坐标轴的图像 [复制链接]