Окружность, чтение клавиши, ожидание нажатия клавиши

example/main.cpp

@@ -1,5 +1,7 @@
 #include "../qtsgraph.h"
-#include <string>
+#include <iostream>
+using namespace std;
+using namespace Qt;
 
 int main(int argc, char *argv[])
 {
@@ -20,13 +22,21 @@ void QTSGraph::PaintBox()
 {
     // Начало рисования
 
+    SetColor(clRed);
+    Circle(300, 300, 100);
+    int k;
+    k = ReadKey();
+    OutTextXY(20, 40, "Код нажатой клавиши: " + to_string(k));
+    if(k == 16777220)
+    {
+        PutPixel(300, 300, clRed, 3);
         for(int i = 0; i <= 5; i++)
         {
             SetPenStyle(1, 1);
             SetColor(clBlue);
             Rectangle(5, 390 + i * 20, 220, 410 + i * 20);
             SetColor(clBlack);
-        OutTextXY(10, 405 + i * 20, std::to_string(i));
+            OutTextXY(10, 405 + i * 20, to_string(i));
             SetPenStyle(1, i);
             Line(30, 400 + i * 20, 200, 400 + i * 20);
         }
@@ -45,6 +55,7 @@ void QTSGraph::PaintBox()
             x += 1;
             Delay(10);
         }
+    }
 
     // Конец рисования
 }

main.cpp

@@ -1,4 +1,6 @@
 #include "qtsgraph.h"
+using namespace Qt;
+using namespace std;
 
 int main(int argc, char *argv[])
 {

qtsgraph.cpp

@@ -34,6 +34,14 @@ QTSGraph::~QTSGraph()
     // Деструктор
 }
 
+void QTSGraph::Circle(int x, int y, int radius)
+{
+    QPainter painter(&Canvas);
+    painter.setPen(Pen);
+    painter.drawEllipse(x - radius, y - radius, radius * 2, radius * 2);
+    update();
+}
+
 bool QTSGraph::MouseClicked()
 {
     bool m = EventMouseClicked;
@@ -41,11 +49,11 @@ bool QTSGraph::MouseClicked()
     return m;
 }
 
-void QTSGraph::OutTextXY(int x, int y, std::string s)
+void QTSGraph::OutTextXY(int x, int y, std::string caption)
 {
     QPainter painter(&Canvas);
     painter.setPen(Pen);
-    painter.drawText(x, y, QString::fromStdString(s));
+    painter.drawText(x, y, QString::fromStdString(caption));
     update();
 }
 
@@ -57,6 +65,18 @@ void QTSGraph::PutPixel(int x, int y, QRgb c, int PenWidth)
     update();
 }
 
+int QTSGraph::ReadKey()
+{
+    if(IDPressedKey == -1)
+    {
+        while(!KeyPressed())
+            Delay(100);
+    }
+    int t = IDPressedKey;
+    IDPressedKey = -1;
+    return t;
+}
+
 void QTSGraph::Rectangle(int x1, int y1, int x2, int y2)
 {
     QPainter painter(&Canvas);
@@ -89,6 +109,13 @@ void QTSGraph::Line(int x1, int y1, int x2, int y2)
     update();
 }
 
+bool QTSGraph::KeyPressed()
+{
+    bool m = EventKeyPressed;
+    EventKeyPressed = false;
+    return m;
+}
+
 void QTSGraph::slotStartTimer()
 {
     StartTimer->stop();
@@ -113,3 +140,13 @@ void QTSGraph::mousePressEvent(QMouseEvent *event)
         // Правая кнопка
     }
 }
+
+void QTSGraph::keyPressEvent(QKeyEvent *event)
+{
+    EventKeyPressed = true;
+    IDPressedKey = event->key();
+    if (IDPressedKey == Qt::Key_Escape)
+    {
+        // Нажатие Esc
+    }
+}

qtsgraph.h

@@ -7,6 +7,7 @@
 #include <QPen>
 #include <QWidget>
 #include <QMouseEvent>
+#include <QKeyEvent>
 #include <QTimer>
 #include <QTime>
 #include <string>
@@ -25,11 +26,14 @@ public:
     QTSGraph(int w = 640, int h = 480, int x = -1, int y = -1, QWidget *parent = nullptr);
     ~QTSGraph();
 
+    void Circle(int x, int y, int radius);
     void Delay(int ms = 1000);
     void Line(int x1, int y1, int x2, int y2);
+    bool KeyPressed();
     bool MouseClicked();
-    void OutTextXY(int x, int y, std::string s);
+    void OutTextXY(int x, int y, std::string caption);
     void PutPixel(int x, int y, QRgb c = 0x00000000, int PenWidth = 1);
+    int ReadKey();
     void Rectangle(int x1, int y1, int x2, int y2);
     void SetColor(QRgb c);
     void SetPenStyle(int PenWidth, int PenStyle = 1); // Толщина и стиль линии
@@ -50,10 +54,13 @@ private:
     QPixmap Canvas;
     QTimer *StartTimer;
     bool EventMouseClicked = false;
+    bool EventKeyPressed = false;
+    int IDPressedKey = -1;
     void PaintBox();
     QPen Pen;
 
 protected:
     void paintEvent(QPaintEvent *event) override;
     void mousePressEvent(QMouseEvent *event) override;
+    void keyPressEvent(QKeyEvent *event)  override;
 };