Graphic Class Method
Draw Method
Digunakan untuk menggambar garis, rectangle, dan ellipse
Drawing Lines
Method DrawLine digunakan untuk menggambar garis yang menghubungkan dua titik.
Contoh2_4 Menggambar Garis
private void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;
Pen redPen = new Pen(Color.Red, 1);
Pen bluePen = new Pen(Color.Blue, 2);
Pen greenPen = new Pen(Color.Green, 3);
Pen blackPen = new Pen(Color.Black, 4);
// Draw line using float coordinates
float x1 = 20.0F, y1 = 20.0F;
float x2 = 200.0F, y2 = 20.0F;
g.DrawLine(redPen, x1, y1, x2, y2);
// Draw line using Point structure
Point pt1 = new Point(20, 20);
Point pt2 = new Point(20, 200);
g.DrawLine(greenPen, pt1, pt2);
// Draw line using PointF structure
PointF ptf1 = new PointF(20.0F, 20.0F);
PointF ptf2 = new PointF(200.0F, 200.0F);
g.DrawLine(bluePen, ptf1, ptf2);
// Draw line using integer coordinates
int X1 = 60, Y1 = 40, X2 = 250, Y2 = 100;
g.DrawLine(blackPen, X1, Y1, X2, Y2);
// Dispose of objects
redPen.Dispose();
bluePen.Dispose();
greenPen.Dispose();
blackPen.Dispose();
}
Contoh2_5 Menggambar Garis yang Terhubung
private void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;
Pen redPen = new Pen(Color.Red, 1);
PointF[] ptsArray ={
new PointF( 20.0F, 20.0F),
new PointF( 20.0F, 200.0F),
new PointF(200.0F, 200.0F),
new PointF(20.0F, 20.0F)};
g.DrawLines(redPen, ptsArray);
}
Drawing Rectangle
Bentuk dasar selanjutnya adalah rectangle. Jika anda ingin menggambar rectangle maka yang harus diperhatikan adalah titik awal / starting point, width, dan height-nya.
Contoh2_6 Menggambar Rectangle
private void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;
// Create pens and points
Pen redPen = new Pen(Color.Red, 1);
Pen bluePen = new Pen(Color.Blue, 2);
Pen greenPen = new Pen(Color.Green, 3);
float x = 5.0F, y = 5.0F;
float width = 100.0F;
float height = 200.0F;
// Create a rectangle
Rectangle rect = new Rectangle(20, 20, 80, 40);
// Draw rectangles
g.DrawRectangle(bluePen,
x, y, width, height);
g.DrawRectangle(redPen,
60, 80, 140, 50);
g.DrawRectangle(greenPen, rect);
// Dispose of objects
redPen.Dispose();
bluePen.Dispose();
greenPen.Dispose();
}
Contoh 2_7 Menggambar Rectangle Berurutan / Series Mode
private void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;
Pen greenPen = new Pen(Color.Green, 4);
RectangleF[] rectArray =
{
new RectangleF( 5.0F, 5.0F, 100.0F, 200.0F),
new RectangleF(20.0F, 20.0F, 80.0F, 40.0F),
new RectangleF(60.0F, 80.0F, 140.0F, 50.0F)
};
g.DrawRectangles(greenPen, rectArray);
greenPen.Dispose();
}
Drawing Ellipses dan Circle
Bentuk ellipses adalah bentuk circular didalam bentuk rectangle. Bentuk ellipses mempunyai titik tengah / center point.
Contoh2_8 Menggambar Ellipses
private void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;
// Create pens
Pen redPen = new Pen(Color.Red, 6);
Pen bluePen = new Pen(Color.Blue, 4);
Pen greenPen = new Pen(Color.Green, 2);
// Create a rectangle
Rectangle rect =
new Rectangle(80, 80, 50, 50);
// Draw ellipses
g.DrawEllipse(greenPen,
100.0F, 100.0F, 10.0F, 10.0F);
g.DrawEllipse(redPen, rect);
g.DrawEllipse(bluePen, 60, 60, 90, 90);
g.DrawEllipse(greenPen,
40.0F, 40.0F, 130.0F, 130.0F);
// Dispose of objects
redPen.Dispose();
greenPen.Dispose();
bluePen.Dispose();
}
Drawing Text
Digunakan untuk menggambar text string dalam graphic surfaces
Contoh2_9 Menggambar String
private void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;
// Create brushes
SolidBrush blueBrush = new SolidBrush(Color.Blue);
SolidBrush redBrush = new SolidBrush(Color.Red);
SolidBrush greenBrush = new SolidBrush(Color.Green);
// Create a rectangle
Rectangle rect = new Rectangle(20, 20, 200, 100);
// The text to be drawn
String drawString = "Hello GDI+ World!";
// Create a Font object
Font drawFont = new Font("Verdana", 14);
float x = 100.0F;
float y = 100.0F;
// String format
StringFormat drawFormat = new StringFormat();
// Set string format flag to direction vertical,
// which draws text vertically
drawFormat.FormatFlags =
StringFormatFlags.DirectionVertical;
// Draw string
g.DrawString("Drawing text",
new Font("Tahoma", 14), greenBrush, rect);
g.DrawString(drawString,
new Font("Arial", 12), redBrush, 120, 140);
g.DrawString(drawString, drawFont,
blueBrush, x, y, drawFormat);
// Dispose of objects
blueBrush.Dispose();
redBrush.Dispose();
greenBrush.Dispose();
drawFont.Dispose();
}
Drawing Arc
Arc adalah bagian dari ellipse, yang dibentuk dari area rectangle, start angle, dan sweep angle. Cara penggunaan Arc adalah sebagai berikut:
Contoh2_11 Menggambar Arc
Buat design form sebagai berikut:
Buat variabel awal untuk deklarasi awal start dan sweep angle
private void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;
Pen redPen = new Pen(Color.Red, 3);
Rectangle rect = new Rectangle(20, 20, 200, 200);
g.DrawArc(redPen, rect, startAngle, sweepAngle);
redPen.Dispose();
}
private void btnReset_Click(object sender, EventArgs e)
{
startAngle =(float)Convert.ToDouble(txtStart.Text);
sweepAngle =(float)Convert.ToDouble(txtSweep.Text);
Invalidate();
}
Drawing Curves
Curve terdiri dari dua macam yaitu open dan close curve
Contoh2_12 Drawing Curves
private void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;
// Create a pen
Pen bluePen = new Pen(Color.Blue, 1);
// Create an array of points
PointF pt1 = new PointF(40.0F, 50.0F);
PointF pt2 = new PointF(50.0F, 75.0F);
PointF pt3 = new PointF(100.0F, 115.0F);
PointF pt4 = new PointF(200.0F, 180.0F);
PointF pt5 = new PointF(200.0F, 90.0F);
PointF[] ptsArray =
{
pt1, pt2, pt3, pt4, pt5
};
// Draw curve
g.DrawCurve(bluePen, ptsArray);
// Dispose of object
bluePen.Dispose();
}
Contoh2_13 Drawing Curves dengan Tension
private float tension = 0.5F;
private void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;
// Create a pen
Pen bluePen = new Pen(Color.Blue, 1);
// Create an array of points
PointF pt1 = new PointF(40.0F, 50.0F);
PointF pt2 = new PointF(50.0F, 75.0F);
PointF pt3 = new PointF(100.0F, 115.0F);
PointF pt4 = new PointF(200.0F, 180.0F);
PointF pt5 = new PointF(200.0F, 90.0F);
PointF[] ptsArray =
{
pt1, pt2, pt3, pt4, pt5
};
// Draw curve
g.DrawCurve(bluePen, ptsArray,tension);
// Dispose of object
bluePen.Dispose();
}
private void btnApply_Click(object sender, EventArgs e)
{
tension = (float)Convert.ToDouble(txtTension.Text);
Invalidate();
}
Contoh2_14 Drawing Closed Curve
private void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;
// Create a pen
Pen bluePen = new Pen(Color.Blue, 1);
// Create an array of points
PointF pt1 = new PointF(40.0F, 50.0F);
PointF pt2 = new PointF(50.0F, 75.0F);
PointF pt3 = new PointF(100.0F, 115.0F);
PointF pt4 = new PointF(200.0F, 180.0F);
PointF pt5 = new PointF(200.0F, 90.0F);
PointF[] ptsArray =
{
pt1, pt2, pt3, pt4, pt5
};
// Draw curve
g.DrawClosedCurve(bluePen, ptsArray);
// Dispose of object
bluePen.Dispose();
}
Drawing Polygon
Polygon adalah bentuk yang terdiri dari tiga atau lebih garis, misal: segitiga, dan kotak.
Contoh2_15 Drawing Polygon
private void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;
// Create pens
Pen greenPen = new Pen(Color.Green, 2);
Pen redPen = new Pen(Color.Red, 2);
// Create points for polygon
PointF p1 = new PointF(40.0F, 50.0F);
PointF p2 = new PointF(60.0F, 70.0F);
PointF p3 = new PointF(80.0F, 34.0F);
PointF p4 = new PointF(120.0F, 180.0F);
PointF p5 = new PointF(200.0F, 150.0F);
PointF[] ptsArray =
{
p1, p2, p3, p4, p5
};
// Draw polygon
g.DrawPolygon(greenPen, ptsArray);
// Dispose of objects
greenPen.Dispose();
redPen.Dispose();
}
Drawing Graphic Path
Graphic Path menghubungkan beberapa objek drawing seperti line, rectable, circle, dll.
Contoh2_16 Drawing Graphic Path
using System.Drawing;
using System.Drawing.Drawing2D;
private void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;
// Create a pen
Pen greenPen = new Pen(Color.Green, 1);
// Create a graphics path
GraphicsPath path = new GraphicsPath();
// Add a line to the path
path.AddLine(20, 20, 103, 80);
// Add an ellipse to the path
path.AddEllipse(100, 50, 100, 100);
// Add three more lines
path.AddLine(195, 80, 300, 80);
path.AddLine(200, 100, 300, 100);
path.AddLine(195, 120, 300, 120);
// Create a rectangle and call
// AddRectangle
Rectangle rect =
new Rectangle(50, 150, 300, 50);
path.AddRectangle(rect);
// Draw path
g.DrawPath(greenPen, path);
// Dispose of object
greenPen.Dispose();
}
Drawing Pie Shapes
Contoh2_17 Drawing Pie Chart
private void btnDraw_Click(object sender, EventArgs e)
{
// Create a Graphics object
Graphics g = this.CreateGraphics();
g.Clear(this.BackColor);
// Get the current value of start and sweep
// angles
float startAngle =
(float)Convert.ToDouble(textBox1.Text);
float sweepAngle =
(float)Convert.ToDouble(textBox2.Text);
// Create a pen
Pen bluePen = new Pen(Color.Blue, 1);
// Draw pie
g.DrawPie(bluePen, 20, 20, 100, 100,
startAngle, sweepAngle);
// Dispose of objects
bluePen.Dispose();
g.Dispose();
}
bersambung Part 3…..
![image_thumb[8]](http://www2.ukdw.ac.id/kuliah/si/erickblog/ObjectOrientedProgramminginCPart3_14E72/image_thumb8.png)
![image_thumb[9]](http://www2.ukdw.ac.id/kuliah/si/erickblog/ObjectOrientedProgramminginCPart3_14E72/image_thumb9.png)
![image_thumb[10]](http://www2.ukdw.ac.id/kuliah/si/erickblog/ObjectOrientedProgramminginCPart3_14E72/image_thumb10.png)
Erick Kurniawan 