diff --git a/Canvas.cpp b/Canvas.cpp
index 579c3db..b185cad 100644
--- a/Canvas.cpp
+++ b/Canvas.cpp
@@ -29,40 +29,13 @@ Canvas::Canvas(QWidget* parent)
     sys = System();
     setMouseTracking(true);
     setBackgroundRole(QPalette::Base);
+    setFocusPolicy(Qt::StrongFocus);
     setAutoFillBackground(true);
 }
 
 Canvas::~Canvas()
 {
-    // Очистка динамически выделенной памяти
-
-    for (double* param : params) {
-        delete param;
-    }
-
-    for (Point* pt : points) {
-        delete pt;
-    }
-
-    for (Line* line : lines) {
-        delete line;
-    }
-
-    // Очистка контейнеров
-    params.clear();
-    points.clear();
-    lines.clear();
-
-    parallelPairs.clear();
-    P2Ppairs.clear();
-    VERT_pairs.clear();
-    HORIZ_pairs.clear();
-
-    // Очистка временных указателей
-    if (current_line)
-        delete current_line;
-    if (firstPoint)
-        delete firstPoint;
+    clearCanvas();
 }
 
 // ===================================================================
@@ -661,6 +634,77 @@ void Canvas::paintEvent(QPaintEvent* event)
     }
 }
 
+void Canvas::keyPressEvent(QKeyEvent* event)
+{
+    switch (event->key()) {
+    case Qt::Key_Delete:
+    case Qt::Key_Clear: {
+        QMessageBox::StandardButton reply;
+        reply = QMessageBox::question(this,
+            "Очистка canvas",
+            "Удалить все объекты и ограничения?",
+            QMessageBox::Yes | QMessageBox::No);
+
+        if (reply == QMessageBox::Yes) {
+            clearCanvas();
+        }
+        break;
+    }
+
+    case Qt::Key_Escape: {
+        // Отмена текущего действия
+        if (mode == Mode::DrawingLine && current_line) {
+            // Отмена рисования линии
+            delete current_line;
+            current_line = nullptr;
+
+            // Удаляем созданные точки и параметры
+            if (points.size() >= 2) {
+                delete points.back();
+                points.pop_back();
+                delete points.back();
+                points.pop_back();
+            }
+            if (params.size() >= 4) {
+                delete params.back();
+                params.pop_back();
+                delete params.back();
+                params.pop_back();
+                delete params.back();
+                params.pop_back();
+                delete params.back();
+                params.pop_back();
+            }
+            mode = Mode::None;
+            update();
+        }
+        else if (mode != Mode::None) {
+            // Отмена любого другого режима
+            mode = Mode::None;
+            current_line = nullptr;
+            firstPoint = nullptr;
+            update();
+        }
+        break;
+    }
+
+    case Qt::Key_Z: {
+        if (event->modifiers() & Qt::ControlModifier) {
+            // Ctrl+Z - отмена последнего ограничения
+            if (constraints_count > 0) {
+                remove_constraint(constraints_count - 1);
+                constraints_count--;
+                solve_for_canvas();
+            }
+        }
+        break;
+    }
+
+    default:
+        QWidget::keyPressEvent(event);
+    }
+}
+
 void Canvas::leaveEvent(QEvent* event)
 {
     Q_UNUSED(event);
@@ -735,4 +779,66 @@ void Canvas::solve_for_canvas()
         }
     after_constraint = false;
     update();
+}
+
+// ===================================================================
+// Очистка всего canvas
+// ===================================================================
+
+void Canvas::clearCanvas()
+{
+    // Очистка солвера
+    sys.clear();
+
+    // Очистка динамически выделенной памяти
+    for (double* param : params) {
+        delete param;
+    }
+
+    for (Point* pt : points) {
+        delete pt;
+    }
+
+    for (Line* line : lines) {
+        delete line;
+    }
+
+    // Очистка контейнеров
+    params.clear();
+    points.clear();
+    lines.clear();
+
+    // Очистка контейнеров ограничений
+    parallelPairs.clear();
+    P2Ppairs.clear();
+    VERT_pairs.clear();
+    HORIZ_pairs.clear();
+    perpendicularPairs.clear();
+
+    // Очистка информации об ограничениях
+    C_Info.clear();
+
+    // Сброс счетчиков
+    obj_count = 0;
+    constraints_count = 0;
+
+    // Очистка временных указателей
+    if (current_line) {
+        delete current_line;
+        current_line = nullptr;
+    }
+
+    if (firstPoint) {
+        delete firstPoint;
+        firstPoint = nullptr;
+    }
+
+    draggedPoint = nullptr;
+    draggedLine = nullptr;
+
+    // Сброс режима
+    mode = Mode::None;
+
+    // Обновление отображения
+    update();
 }
\ No newline at end of file
diff --git a/Canvas.h b/Canvas.h
index fc2bfb2..a6b996a 100644
--- a/Canvas.h
+++ b/Canvas.h
@@ -6,6 +6,7 @@ constexpr auto EPS = 1e-9;
 #include <QPointF>
 #include <QMessageBox>
 #include <QToolTip>
+#include <QKeyEvent>
 
 #ifdef _DEBUG
 #include <QDebug>
@@ -59,6 +60,7 @@ protected:
     void mouseMoveEvent(QMouseEvent* event) override;
     void mouseReleaseEvent(QMouseEvent* event) override;
     void paintEvent(QPaintEvent* event) override;
+    void keyPressEvent(QKeyEvent* event);
     void leaveEvent(QEvent* event) override;
 
 private:
@@ -148,4 +150,5 @@ private:
     std::map<int, ConstraintInfo> C_Info;
 
     void solve_for_canvas();
+    void clearCanvas();
 };
\ No newline at end of file