c++实践报告

}

//finishingImg = bmp;

// DrawTools_Graphics = pictureBox1->CreateGraphics();

然后就是功能实现部分的代码：

private: System::Void toolStripButton5_Click(System::Object^ sender, System::EventArgs^ e) { }

private: System::Void toolStripButton1_Click(System::Object^ sender, System::EventArgs^ e) { }

private: System::Void toolStripButton2_Click(System::Object^ sender, System::EventArgs^ e) { }

private: System::Void toolStripButton3_Click(System::Object^ sender, System::EventArgs^ e) { }

private: System::Void toolStripButton4_Click(System::Object^ sender, System::EventArgs^ e) { }

private: System::Void pictureBox1_MouseDown(System::Object^ sender, System::Windows::Forms::MouseEventArgs^ e){ }

private: System::Void pictureBox1_MouseMove(System::Object^ sender, System::Windows::Forms::MouseEventArgs^ e) {

newGraphics->DrawLine(pen, startPointF, currentPointF);

Thread::Sleep(6);

if (startdraw == true){

if (sType == \){

newGraphics = Graphics::FromImage(finishingImg); PointF currentPointF = PointF(e->X, e->Y);

if (e->Button == System::Windows::Forms::MouseButtons::Left){ }

startdraw = true;

startPointF = PointF(e->X, e->Y); sType = \; sType = \; sType = \; sType = \;

colorDialog1->ShowDialog(); pencolor = colorDialog1->Color; pen->Color = pencolor;

}

startPointF = currentPointF; //newGraphics->Dispose;

DrawTools_Graphics->DrawImage(finishingImg, 0, 0);

else if (sType == \){ }

else if (sType == \){ } else{ }

//delete(newGraphics);

Image^ img = orginalImg;

newGraphics = Graphics::FromImage(img);

float width = Math::Abs(e->X - startPointF.X);//确定矩形的宽 float heigth = Math::Abs(e->Y - startPointF.Y);//确定矩形的高 PointF rectStartPointF = startPointF; if (e->X < startPointF.X) { }

if (e->Y < startPointF.Y) { }

newGraphics->FillRectangle(gcnew SolidBrush(pencolor), rectStartPointF.X, newGraphics = Graphics::FromImage(finishingImg); newGraphics->DrawImage(img, 0, 0);//将图片画到中间图片 DrawTools_Graphics->DrawImage(img, 0, 0);

//DrawTools_Graphics->DrawImage(finishingImg, 0, 0);

rectStartPointF.Y = e->Y; rectStartPointF.X = e->X;

if (startdraw) { }

newGraphics = Graphics::FromImage(finishingImg);

newGraphics->FillRectangle(gcnew SolidBrush(Color::White), e->X, e->Y,

DrawTools_Graphics->DrawImage(finishingImg, 0, 0);

20, 20);

rectStartPointF.Y, width, heigth);

}

}

//delete(img);

private: System::Void pictureBox1_MouseUp(System::Object^ sender, System::Windows::Forms::MouseEventArgs^ e) { }

private: System::Void pictureBox1_Paint(System::Object^ sender, System::Windows::Forms::PaintEventArgs^ e) { }

private: System::Void Form1_Load(System::Object^ sender, System::EventArgs^ e) { } }; }

pencolor = Color::Black;

Bitmap^ bmp = gcnew Bitmap(pictureBox1->Width, pictureBox1->Height); orginalImg = bmp; finishingImg = bmp;

DrawTools_Graphics = pictureBox1->CreateGraphics(); newGraphics = Graphics::FromImage(orginalImg); newGraphics->DrawImage(finishingImg, 0, 0); startdraw = false;

// newGraphics->Dispose();

第二个是计算器，计算器的设计是最花费时间的，首先我们需要进行界面的设计，为了完成简单的计算，设计了两个float变量一个存计算的结果一个存用户点击的数字，还有一个字符变量用于存储用户点击的运算方式，当用户点击等于号的时候，就将两个float变量进行运算，再通过update函数更新运算结果到界面上。

众所周知，计算器大量应用于物理数学等领域，若直接根据公式手动计算的话，计算量较大，十分不方便。因此在这次c++实践中，我选择用CLR做了计算器系统，只需在对应的位置中输入数值和运算符，即可求出解，降低了运算的麻烦，为广大学生及相应学科工作者提供方便。 设计界面图：

重要函数模块：

对输入的数字进行判断：

private: System::Void button1_Click(System::Object^ { label1->Text=\; m=0;

} private: System::Void button2_Click(System::Object^ { textBox1->Text=m.ToString(); } private: System::Void button3_Click(System::Object^ { m=Double::Parse(textBox1->Text); label1->Text=\;

} private: System::Void button4_Click(System::Object^ { m=m+Double::Parse(textBox1->Text); /*textBox1->Text=m.ToString();*/ } private: System::Void button5_Click(System::Object^ {

m=m-Double::Parse(textBox1->Text); sender, System::EventArgs^ sender, System::EventArgs^ sender, System::EventArgs^ sender, System::EventArgs^ sender, System::EventArgs^ e) e)

e)

e)

e)