88 lines
2.9 KiB
C++
88 lines
2.9 KiB
C++
#ifndef WIDGET_H
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#define WIDGET_H
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#include <QWidget>
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namespace Ui {
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class Widget;
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}
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#include <QWidget>
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#include <QPainter>
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#include <QMouseEvent>
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#include <QPoint>
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#include <QtMath>
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class Widget : public QWidget
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{
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Q_OBJECT
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public:
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explicit Widget(QWidget *parent = nullptr);
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~Widget();
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void paintEvent(QPaintEvent *) override {
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QPainter painter(this);
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painter.setRenderHint(QPainter::Antialiasing, true);
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// 设置画笔的颜色和样式
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painter.setPen(Qt::black);
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// 获取Widget的尺寸
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int width = this->width();
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int height = this->height();
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// 定义坐标原点的位置
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int centerX = width / 2;
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int centerY = height / 2;
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// 绘制X轴
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painter.drawLine(centerX, 0, centerX, height);
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// 绘制Y轴
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painter.drawLine(0, centerY, width, centerY);
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// 可选地，绘制网格线
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int step = 50; // 网格线之间的间隔
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painter.setPen(Qt::lightGray);
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for (int i = step; i < width; i += step) {
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painter.drawLine(i, 0, i, height);
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painter.drawLine(-i + centerX * 2, 0, -i + centerX * 2, height);
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}
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for (int i = step; i < height; i += step) {
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painter.drawLine(0, i, width, i);
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painter.drawLine(0, -i + centerY * 2, width, -i + centerY * 2);
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}
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// 绘制坐标轴上的刻度
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painter.setPen(Qt::darkGray);
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QFontMetrics fm = fontMetrics();
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int textWidth = fm.horizontalAdvance(QString::number(step));
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int textHeight = fm.height();
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for (int i = step; i <= width / 2; i += step) {
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painter.drawText(QPoint(centerX + i - textWidth / 2, centerY + textHeight), QString::number(i));
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painter.drawText(QPoint(centerX - i - textWidth / 2, centerY + textHeight), QString::number(-i));
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painter.drawText(QPoint(centerX - textWidth / 2, centerY - i), QString::number(-i));
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painter.drawText(QPoint(centerX - textWidth / 2, centerY + i), QString::number(i));
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}
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// 绘制箭头指示坐标方向
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painter.setPen(Qt::black);
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painter.drawLine(centerX - 5, centerY, centerX + 5, centerY);
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painter.drawLine(centerX, centerY - 5, centerX, centerY + 5);
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}
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private:
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QPoint calculateCenter(QPoint p1, QPoint p2, QPoint p3) {
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// 这里需要实现计算圆心的逻辑
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return QPoint(100, 100); // 假设的圆心位置
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}
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int calculateRadius(QPoint center, QPoint point) {
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// 计算半径
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return qSqrt(qPow(point.x() - center.x(), 2) + qPow(point.y() - center.y(), 2));
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}
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private:
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Ui::Widget *ui;
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};
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#endif // WIDGET_H
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