2024年5月7日发(作者：)

using System;

using c;

using entModel;

using ;

using g;

using ;

using ;

using ;

namespace WindowsFormsApplication2

{

publicpartialclassForm3 : Form

{

privateint i;

bool mousepress = false;

privatefloat sx1, ey1, sx2, ey2;

public Form3()

{

InitializeComponent();

}

privatevoid button1_Click(object sender, EventArgs e)

{

i = 1;

/*Pen myPen = new Pen();

Graphics gobj = Graphics();

ne(myPen, 30, 30, 120, 120); */

}

privatevoid button2_Click(object sender, EventArgs e)

{

i = 2;

/*Pen myPen = new Pen();

Graphics gobj = Graphics();

lipse(myPen, new Rectangle(30, 30, 100, 100));*/

}

privatevoid button3_Click(object sender, EventArgs e)

{

i = 3;

/* Form fr = new Form2();

alog();*/

}

privatevoid Form3_MouseDown(object sender, MouseEventArgs e)

{

sx1 = on.X;

ey1 = on.Y;

mousepress = true;

}

privatevoid Form3_MouseMove(object sender, MouseEventArgs e)

{

if (mousepress == true)

{

sx2 = on.X;

ey2 = on.Y;

using (Graphics g = Graphics())

{

();

if (i == 1)

{

ne(, sx1, ey1, sx2, ey2);

}

elseif (i == 2)

{

cmp();

}

else

{

dstring();

}

}

}

}

privatevoid Form3_MouseUp(object sender, MouseEventArgs e)

{

sx2 = on.X;

ey2 = on.Y;

Pen myPen = newPen();

Graphics g = Graphics();

if (i == 1)

{

ne(myPen, sx1, ey1, sx2, ey2);

}

elseif (i == 2)

{

cmp();

}

else

{

dstring();

}

mousepress = false;

}

protectedvoid cmp()

{

Graphics g = Graphics();

if (sx1 < sx2 && ey1 < ey2)

{

lipse(, sx1, ey1, sx2 - sx1, ey2 - ey1);

}

elseif (sx1 > sx2 && ey1 > ey2)

{

lipse(, sx2, ey2, sx1 - sx2, ey1 - ey2);

}

elseif (sx1 < sx2 && ey1 > ey2)

{

lipse(, sx1, ey2, sx2 - sx1, ey1 - ey2);

}

else

{

lipse(, sx2, ey1, sx1 - sx2, ey2 - ey1);

}

}

protectedvoid dstring()

{

Graphics g = Graphics();

string drawString = "使用drawstring方法";

Font myFont = newFont("黑体", 16);

Brush b = newSolidBrush();

StringFormat myFormat = newStringFormat();

ring(drawString, myFont, b, sx1, ey1, myFormat);

}

}

}