namespace Intro_To_Graphic
{
//Drawing Geometrical shapes; lines, rectangles, circles,triangles...
//.Net provides classes for drawing and filling.
//Classes needed: Graphics class, Pen class, Brush class, struct Point
//To draw you need to:
// 1. Create a graphic object
// 2. Create a Pen
// 3. Draw the shape
//To fill you need to:
// 1. Create a graphics object
// 2. Create a Brush
// 3. Fill the shape
//Notes: We can use either PictureBox or Panel to draw graphic pictures
public partial class Form1 : Form
{
/*
* To draw on a picturebox, you need to create
* a Bitmap. Do all the drawing on the bitmap
* then put the bitmap onto the pictureBox
* ============================================
* Step 1: is to create a bitmap with same dimension as the picturebox
* ============================================
* Step 2: is to create a Graphics object for the bitmap
* ============================================
* Step 3: Figure out the points and the color
* ============================================
* Step 4: Draw the shape
*/// ============================================
//declare a bitmap
Bitmap bmap;
//declare a Graphic object
Graphics g;
//Random object
Random rand = new Random();
public Form1()
{
InitializeComponent();
bmap = new Bitmap(pictureBox1.Width, pictureBox1.Height);
g = Graphics.FromImage(bmap);
}
//helper methods
//method to return a random
private Point GetRandomPoint(Bitmap bitmap)
{
int x = rand.Next(bitmap.Width);
int y = rand.Next(bitmap.Height);
Point p = new Point(x, y);
return p;
}
//method to return random color
private Color GetRandomColor()
{
int red = rand.Next(256); //0 - 255)
int green = rand.Next(256); //0 - 255)
int blue = rand.Next(256); //0 - 255)
Color c = Color.FromArgb(red, green, blue);
return c;
}
private void btnDrawLine_Click(object sender, EventArgs e)
{
int lineThickness = rand.Next(1, 7);
Color color = GetRandomColor();
Pen pen = new Pen(color, lineThickness);
Point p1 = GetRandomPoint(bmap);
Point p2 = GetRandomPoint(bmap);
g.DrawLine(pen, p1, p2);
//place the bmap
pictureBox1.Image = bmap;
}
private void btnDrawRectangle_Click(object sender, EventArgs e)
{
//need a pen, x, y, widgth, height
Point p = GetRandomPoint(bmap);
int x = p.X;
int y = p.Y;
//set width, height;
int width = rand.Next(bmap.Width - x);
int height = rand.Next(bmap.Height - y);
//generate a random color
Color color = GetRandomColor();
//create pen
int lineThickness = rand.Next(1, 7);
Pen pen = new Pen(color, lineThickness);
//draw rectangle
g.DrawRectangle(pen, x, y, width, height);
pictureBox1.Image = bmap;
}
private void btnDrawEllipse_Click(object sender, EventArgs e)
{
Point p = GetRandomPoint(bmap);
int x = p.X;
int y = p.Y;
//define width and height
int width = rand.Next(bmap.Width - x);
int height = rand.Next(bmap.Height - y);
//generate a random color
Color color = GetRandomColor();
//create a Pen
int lineThickness = rand.Next(1, 7);
Pen pen = new Pen(color, lineThickness);
g.DrawEllipse(pen, x, y, width, height);
pictureBox1.Image = bmap;
}
private void btnDrawCircle_Click(object sender, EventArgs e)
{
Point p = GetRandomPoint(bmap);
int x = p.X;
int y = p.Y;
//define width and height
int width = rand.Next(bmap.Width - x);
int height = rand.Next(bmap.Height - y);
int diameter = Math.Min(width, height);
//generate a random color
Color color = GetRandomColor();
//create a Pen
int lineThickness = rand.Next(1, 7);
Pen pen = new Pen(color, lineThickness);
g.DrawEllipse(pen, x, y, diameter, diameter);
pictureBox1.Image = bmap;
}
private void button1_Click(object sender, EventArgs e)
{
bmap = new Bitmap(pictureBox1.Width, pictureBox1.Height);
g = Graphics.FromImage(bmap);
pictureBox1.Image = bmap;
}
private void btnFillRectangle_Click(object sender, EventArgs e)
{
//need a pen, x, y, widgth, height
Point p = GetRandomPoint(bmap);
int x = p.X;
int y = p.Y;
//set width, height;
int width = rand.Next(bmap.Width - x);
int height = rand.Next(bmap.Height - y);
//create solidBrush
Color color = GetRandomColor();
SolidBrush brush = new SolidBrush(color);
g.FillRectangle(brush, x, y, width, height);
pictureBox1.Image = bmap;
}
private void btnFillEllipse_Click(object sender, EventArgs e)
{
Point p = GetRandomPoint(bmap);
int x = p.X;
int y = p.Y;
//define width and height
int width = rand.Next(bmap.Width - x);
int height = rand.Next(bmap.Height - y);
//create solidBrush
Color color = GetRandomColor();
SolidBrush brush = new SolidBrush(color);
g.FillEllipse(brush, x, y, width, height);
pictureBox1.Image = bmap;
}
private void btnfillCircle_Click(object sender, EventArgs e)
{
Point p = GetRandomPoint(bmap);
int x = p.X;
int y = p.Y;
//define width and height
int width = rand.Next(bmap.Width - x);
int height = rand.Next(bmap.Height - y);
int diameter = Math.Min(width, height);
//create solidBrush
Color color = GetRandomColor();
SolidBrush brush = new SolidBrush(color);
g.FillEllipse(brush, x, y, diameter, diameter);
pictureBox1.Image = bmap;
}
int angle = 0;
Point p1;
Point p2;
int r;
Pen pen;
private void Form1_Load(object sender, EventArgs e)
{
p1 = new Point(bmap.Width / 2, bmap.Height / 2);
r = Math.Min(bmap.Width / 2, bmap.Height / 2);
p2 = new Point(bmap.Width, bmap.Height / 2);
pen = new Pen(Color.White);
}
private void timer1_Tick(object sender, EventArgs e)
{
g.DrawLine(pen, p1, p2);
pictureBox1.Image = bmap;
angle++;
if (angle > 360)
{
angle = 0;
pen = new Pen(GetRandomColor());
}
p2.X = (int)(r * Math.Cos(Math.PI * angle / 180));
p2.Y = (int)(r * Math.Sin(Math.PI * angle / 180));
}
private void btnRotateline_Click(object sender, EventArgs e)
{
g.DrawLine(pen, p1, p2);
pictureBox1.Image = bmap;
angle++;
if (angle > 360)
angle = 0;
p2.X = (int)(r * Math.Cos(Math.PI * angle / 180));
p2.Y = (int)(r * Math.Sin(Math.PI * angle / 180));
}
private void btnDrawPie_Click(object sender, EventArgs e)
{
Point p = GetRandomPoint(bmap);
int x = p.X;
int y = p.Y;
//define width and height
int width = 1+rand.Next(10, bmap.Width - x);
int height = 1+rand.Next(10, bmap.Height - y);
int diameter = Math.Min(width, height);
//create solidBrush
Color color = GetRandomColor();
Pen pen = new Pen(color, rand.Next(1, 5));
int startAngle = rand.Next(91);
int sweepAngle = rand.Next(25, 150);
//draw pie
g.DrawPie(pen, x, y, diameter, diameter, startAngle, sweepAngle);
pictureBox1.Image = bmap;
//Readmore about angle on //http://msdn.microsoft.com/en-us/library/k0s75s5z(v=vs.110).aspx
}
private void btnFillPie_Click(object sender, EventArgs e)
{
Point p = GetRandomPoint(bmap);
int x = p.X;
int y = p.Y;
//define width and height
int width = 1+rand.Next(bmap.Width - x);
int height = 1+rand.Next(bmap.Height - y);
int diameter = Math.Min(width, height);
//create solidBrush
Color color = GetRandomColor();
SolidBrush brush = new SolidBrush(color);
int startAngle = rand.Next(-91, 91);
int sweepAngle = rand.Next(25, 150);
//draw pie
//g.DrawPie(pen, x, y, diameter, diameter, startAngle, sweepAngle);
g.FillPie(brush, x, y, diameter, diameter, startAngle, sweepAngle);
pictureBox1.Image = bmap;
}
private void btnDrawSixPieChart_Click(object sender, EventArgs e)
{
//Lab Assignment to do:
//Draw a pie chart with 6 pies
//Each with different color
Point p = GetRandomPoint(bmap);
int x = p.X;
int y = p.Y;
//define width and height
int width = 100;
int height = width;
Rectangle rect = new Rectangle(x, y, width, height);
//int diameter = Math.Min(width, height);
SolidBrush brush = new SolidBrush(Color.AliceBlue);
int startAngle = 90;
int sweepAngle = 60;
g.FillPie(brush, rect, startAngle, sweepAngle);
brush = new SolidBrush(Color.Green);
startAngle += sweepAngle;
sweepAngle = 60;
g.FillPie(brush, rect, startAngle, sweepAngle);
brush = new SolidBrush(Color.Yellow);
startAngle += sweepAngle;
sweepAngle = 60;
g.FillPie(brush, rect, startAngle, sweepAngle);
brush = new SolidBrush(Color.Blue);
startAngle += sweepAngle;
sweepAngle = 60;
g.FillPie(brush, rect, startAngle, sweepAngle);
brush = new SolidBrush(Color.Red);
startAngle += sweepAngle;
sweepAngle = 60;
g.FillPie(brush, rect, startAngle, sweepAngle);
brush = new SolidBrush(Color.Orange);
startAngle += sweepAngle;
sweepAngle = 60;
g.FillPie(brush, rect, startAngle, sweepAngle);
pictureBox1.Image = bmap;
}
}
}
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