Oscilloscope in C#
Still working with software for
flow cytometry instruments, I needed a quick and informal way of visuall representing an incoming variable stream
of data as a trace, just like an oscilloscope.
Using GDI+ in C# to trace a line defined by points and redrawn every millisecond with random values.
Ofcourse, instead of the random values one could use values provided by a source and display a correct trace.
Oscilloscope.zip (6kb)
cs code
private void initHistogram(){
myRectangle = new Rectangle(10, 10, 200, 200);
mDataPen = new Pen(Color.Navy, 2);
myGraphic = this.CreateGraphics();
this.button1.Enabled = false;
timer1.Stop();
timer1.Enabled = false;
timer1.Enabled = true;
}
private void button1_Click(object sender, System.EventArgs e) {
this.button1.Enabled = false;
timer1.Stop();
timer1.Enabled = false;
timer1.Enabled = true;
}
private void DrawData(){
populateArray2();
Point[] pts = new Point[mData.Count];
for (int i=0; i < mData.Count; i++){
pts[i].X = LeftOffset + ((Point)mData[i]).X;
pts[i].Y = myRectangle.Height - (BottomOffset + ((Point)mData[i]).Y);
}
myGraphic.Clear(System.Drawing.SystemColors.Control);
myGraphic.DrawRectangle(
Pens.Black,
4,
4,
myRectangle.Width - 1,
myRectangle.Height - 1);
pMaxValue = myRectangle.Height-(BottomOffset + pMax);
this.label1.Text = pMax.ToString();
this.label1.Location = new Point(10, pMaxValue-25);
myGraphic.DrawLine(Pens.Black,10,pMaxValue,180,pMaxValue);
myGraphic.DrawCurve(mDataPen, pts);
}
public void timer1_Tick(object sender, System.EventArgs e){
DrawData();
}
private void populateArray2(){
mData.Clear();
for(int i=0;i<loopCount;i=i+trackBar3.Value){
if (
i < (loopCount/2) - trackBar2.Value ||
i > (loopCount/2) + trackBar2.Value){
rndnum = r.Next(0,10);
}else{
rndnum = r.Next(trackBar1.Value - trackBar4.Value/2,trackBar1.Value);
}
mData.Add(new Point(i, rndnum));
if (i == 0){
pMax = rndnum;
}else{
if(rndnum > pMax){
pMax = rndnum;
}
}
}
}