I needed to do a sound demonstration for a psychology project, and thought I'd utilize wave theory for the background. However, I didn't have a convenient way of drawing sine waves. So I made a C# project do it for me. Took about 15 minutes. Here's the interesting stuff:
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
this.pictureBox1.Image = GenerateSineWave(360, 50, 360);
this.pictureBox2.Image = GenerateSineWave(360, 50, 180);
this.pictureBox3.Image = GenerateSineWave(360, 50, 120);
this.pictureBox4.Image = GenerateCombinedSineWave(360, 50, 360, 180, 120);
}
public static Image GenerateSineWave(int width, int height, int period)
{
Bitmap bmp = new Bitmap(width, height);
using (Graphics gfx = Graphics.FromImage(bmp))
{
gfx.FillRectangle(new SolidBrush(Color.White), 0, 0, bmp.Width, bmp.Height);
Brush scale = new SolidBrush(Color.Red);
Pen pScale = new Pen(scale);
gfx.DrawLine(pScale, 0, 0, 0, height);
int midHeight = height / 2;
gfx.DrawLine(pScale, 0, midHeight, width, midHeight);
}
double periodRatio = 360.0 / (double)period;
for (int i = 0; i < width; i++)
{
double rad = DegToRad((double)i * periodRatio);
double sinVal = Math.Sin(rad);
double y = -(sinVal * 20.0) + 25;
bmp.SetPixel(i, (int)y, Color.Black);
}
return bmp;
}
public static Image GenerateCombinedSineWave(int width, int height, int pd1, int pd2, int pd3)
{
Bitmap bmp = new Bitmap(width, height);
using (Graphics gfx = Graphics.FromImage(bmp))
{
gfx.FillRectangle(new SolidBrush(Color.White), 0, 0, bmp.Width, bmp.Height);
Brush scale = new SolidBrush(Color.Red);
Pen pScale = new Pen(scale);
gfx.DrawLine(pScale, 0, 0, 0, height);
int midHeight = height / 2;
gfx.DrawLine(pScale, 0, midHeight, width, midHeight);
}
double pdRat1 = 360.0 / (double)pd1;
double pdRat2 = 360.0 / (double)pd2;
double pdRat3 = 360.0 / (double)pd3;
for (int i = 0; i < width; i++)
{
double rad1 = DegToRad((double)i * pdRat1);
double rad2 = DegToRad((double)i * pdRat2);
double rad3 = DegToRad((double)i * pdRat3);
double sin1 = Math.Sin(rad1);
double sin2 = Math.Sin(rad2);
double sin3 = Math.Sin(rad3);
double y = sin1 + sin2 + sin3;
y = -(y * 20.0 / 3.0) + 25.0;
bmp.SetPixel(i, (int)y, Color.Black);
}
return bmp;
}
private static double DegToRad(double degr)
{
return (Math.PI * degr) / 180.0;
}
Full Visual Studio 2005 project is included in the attachments.
Cool.
Class Form1... :P
Quote from: Blaze on April 20, 2006, 09:35:16 PM
Class Form1... :P
Quote from: MyndFyrex86] link=topic=5620.msg65809#msg65809 date=1145439337]
Took about 15 minutes.
Quote from: MyndFyrex86] link=topic=5620.msg65809#msg65809 date=1145439337]
I needed to do a sound demonstration for a psychology project,
I also used a partial class, designers, and didn't rename the designed form objects. (this.pictureBox1) :P