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verifycodewidget.cpp

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+#include "verifycodewidget.h"
+
+#include <QPainter>
+#include <QPen>
+#include <QFont>
+#include <QChar>
+#include <QPaintEvent>
+#include <QMouseEvent>
+#include <QColor>
+#include <QString>
+
+#include "model/data.h"
+
+VerifyCodeWidget::VerifyCodeWidget(QWidget *parent)
+	: QWidget(parent),
+    randomGenerator(model::getTime())
+{
+	verifyCode = generateVerifyCode();
+}
+
+QString VerifyCodeWidget::generateVerifyCode()
+{
+	QString code;
+	for (int i = 0; i < 4; i++) {
+		//每次循环生成一个字符
+		int init = 'A';
+		init += randomGenerator.generate() % 26;
+		code += static_cast<QChar>(init);
+	}
+	return code;
+}
+
+void VerifyCodeWidget::refreshVerifyCode()
+{
+    verifyCode = generateVerifyCode();
+    // 通过 update 就可以起到 "刷新界面" , 本身就是触发 paintEvent
+    this->update();
+}
+
+bool VerifyCodeWidget::checkVerifyCode(const QString& verifyCode)
+{
+    //此处比较验证码需要忽略大小写
+    return this->verifyCode.compare(verifyCode, Qt::CaseInsensitive) == 0;
+}
+
+void VerifyCodeWidget::paintEvent(QPaintEvent* event)
+{
+    (void)event;
+    const int width = 180;
+    const int height = 80;
+
+    QPainter painter(this);
+    QPen pen;
+    QFont font("楷体", 25, QFont::Bold, true);
+    painter.setFont(font);
+
+    // 画点: 添加随机噪点
+    for (int i = 0; i < 100; i++)
+    {
+        pen = QPen(QColor(randomGenerator.generate() % 256, randomGenerator.generate() % 256, randomGenerator.generate() % 256));
+        painter.setPen(pen);
+        painter.drawPoint(randomGenerator.generate() % width, randomGenerator.generate() % height);
+    }
+
+    // 画线: 添加随机干扰线
+    for (int i = 0; i < 5; i++)
+    {
+        pen = QPen(QColor(randomGenerator.generate() % 256, randomGenerator.generate() % 256, randomGenerator.generate() % 256));
+        painter.setPen(pen);
+        painter.drawLine(randomGenerator.generate() % width, randomGenerator.generate() % height,
+            randomGenerator.generate() % width, randomGenerator.generate() % height);
+    }
+
+    // 绘制验证码
+    for (int i = 0; i < verifyCode.size(); i++)
+    {
+        // 随机字体大小
+        int fontSize = 13 + randomGenerator.generate() % 16; // 20~35
+        QFont font("楷体", fontSize, QFont::Bold, true);
+        painter.setFont(font);
+
+        // 随机旋转角度（-30~30度）
+        int angle = (randomGenerator.generate() % 61) - 30;
+
+        // 随机颜色
+        pen = QPen(QColor(randomGenerator.generate() % 255, randomGenerator.generate() % 255, randomGenerator.generate() % 255));
+        painter.setPen(pen);
+
+        // 保存当前状态
+        painter.save();
+
+        // 计算字符中心点
+        int x = 5 + 22 * i;
+        int y = 10;
+        int w = 30, h = 30;
+        QPoint center(x + w / 2, y + h / 2);
+
+        // 平移到中心，旋转，再平移回去
+        painter.translate(center);
+        painter.rotate(angle);
+        painter.translate(-center);
+
+        // 绘制字符
+        painter.drawText(x, y, w, h, Qt::AlignCenter, QString(verifyCode[i]));
+
+        // 恢复状态
+        painter.restore();
+    }
+
+    // 绘制验证码
+    /*for (int i = 0; i < verifyCode.size(); i++)
+    {
+        pen = QPen(QColor(randomGenerator.generate() % 255, randomGenerator.generate() % 255, randomGenerator.generate() % 255));
+        painter.setPen(pen);
+        painter.drawText(5 + 22 * i, randomGenerator.generate() % 10, 30, 30, Qt::AlignCenter, QString(verifyCode[i]));
+    }*/
+
+}
+
+void VerifyCodeWidget::mousePressEvent(QMouseEvent* event)
+{
+    (void)event;
+    this->refreshVerifyCode();
+}