Drawing trigonometric transformations (Visual C++)

struct x_y

{

int x_panel;

int y_panel;

double xr_width;

double yr_height;

};

double a[3];

double b[3];

float value_sin_1(double a1,double a2, double a3,double a4)

{

float value;

value=a1+a3*sin(-1.0*(a2-a3)/a3*a4);

return value;

}

float value_cos_1(double a1, double a2, double a3, double a4)

{

float value;

value=a1+a3*cos(-1.0*(a2-a3)/a3*a4);

return value;

}

float value_sin_2(double a1, double a2, double a3, double a4)

{

float value;

value=a1-a3*sin(-1.0*(a2-a3)/a3*a4);

return value;

}

float value_cos_2(double a1,double a2, double a3, double a4)

{

float value;

value=a1-a3*cos(-1.0*(a2-a3)/a3*a4);

return value;

}

float value_sin_3(double a1, double a2, double a3, double a4)

{

float value;

value=a1+(a2-a3)*sin(1.0*a4);

return value;

}

float value_cos_3(double a1, double a2, double a3, double a4)

{

float value;

value=a1+(a2-a3)*cos(1.0*a4);

return value;

}

#pragma endregion

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

}

private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {

Graphics^ draw1=panel1->CreateGraphics();

struct x_y date;

date.x_panel=panel1->Width/2;

date.y_panel=panel1->Height/2;

date.xr_width=1.*panel1->Width/2.;

date.yr_height=1.*panel1->Height/4.;

double pi=3.14159265359;

double max_value=3.0*pi;

double step;

Random^ random_value=gcnew Random();

Pen^ draw_pen;

System::Drawing::Color my_color;

for(step=0.0;step<max_value;step+=0.01)

{

a[0]=value_cos_3(date.x_panel,date.xr_width,date.yr_height,step);

b[0]=value_sin_3(date.x_panel,date.xr_width,date.yr_height,step);

a[1]=value_cos_1(a[0],date.xr_width,date.yr_height,step);

b[1]=value_sin_1(b[0],date.xr_width,date.yr_height,step);

a[2]=value_cos_2(a[1],date.xr_width,date.yr_height,step);

b[2]=value_sin_2(b[1],date.xr_width,date.yr_height,step);

my_color=System::Drawing::Color::FromArgb(random_value->Next(255),

random_value->Next(255),random_value->Next(255));

draw_pen=gcnew Pen(my_color);

draw1->DrawLine(draw_pen,int(a[1]),int(b[1]),int(a[2]),int(b[2]));

}

}

private: System::Void button2_Click(System::Object^  sender, System::EventArgs^  e) {

Close();

}

};

}