原创 Labwindows/cvi8.5学习日志(41)----虚拟简易示波器

//*****************************************************************************
// Labwindows/cvi8.5  虚拟简易示波器
// szlihongtao
// 2010-07-29
//***************************************************************************** 
#include <analysis.h>
#include <ansi_c.h>
#include <cvirte.h>  
#include <userint.h>
#include "虚拟简易示波器.h"
//*****************************************************************************
#define NUM_DIV    10    // X轴的分格数
#define SAMPLES_DIV   48    // X轴每格对应显示点数
#define SAMPLES_TOTAL  (NUM_DIV*SAMPLES_DIV)  // X轴的总的点数
//*****************************************************************************
static int panelHandle;
//*****************************************************************************
int main (int argc, char *argv[])
{
 if (InitCVIRTE (0, argv, 0) == 0)
  return -1; /* out of memory */
 if ((panelHandle = LoadPanel (0, "虚拟简易示波器.uir", PANEL)) < 0)
  return -1;
 DisplayPanel (panelHandle);
 RunUserInterface ();
 DiscardPanel (panelHandle);
 return 0;
}
//*****************************************************************************
int CVICALLBACK func_exit (int panel, int control, int event,
  void *callbackData, int eventData1, int eventData2)
{
 switch (event)
 {
  case EVENT_COMMIT:
   QuitUserInterface (0);
   break;
 }
 return 0;
}
//*****************************************************************************
int CVICALLBACK func_gen (int panel, int control, int event,
  void *callbackData, int eventData1, int eventData2)
{
   double *arr;
   double Amplitude;
   int Number_of_Elements;
   double Phase_Degrees;
   double Number_of_Cycles;
   double *Sine_Pattern;
   double fx,fs,f;
   double gain;
   int sec_div;
   int temp;
           
 switch (event)
 {
  case EVENT_COMMIT: 
  {
   Number_of_Elements=SAMPLES_TOTAL;
   GetCtrlVal (panelHandle, PANEL_NUMERIC, &Amplitude); // 信号幅度
   GetCtrlVal (panelHandle, PANEL_NUMERIC_2, &Phase_Degrees);// 初始相位
   GetCtrlVal (panelHandle, PANEL_NUMERIC_3, &fx);   // 信号的原始频率
   GetCtrlVal (panelHandle, PANEL_RINGDIAL_DIV, &sec_div); // 每格代表的时间
   
   fs=Number_of_Elements*1000000.0/(double)(NUM_DIV*sec_div); // 采样频率     
  
   Sine_Pattern=malloc(Number_of_Elements*sizeof(double));   // 申请数组内存
   
   #if 1      // 方法1
    f=fx/fs; // Frequency of the resulting sine wave signal in normalized units of cycles/sample.
    SineWave (Number_of_Elements, Amplitude,f,&Phase_Degrees,Sine_Pattern);
   #else      // 方法2           
    f=Number_of_Elements*fx/fs;     // Number_of_Cycles,正弦波每个周期对应的点数
    SinePattern (Number_of_Elements,Amplitude,Phase_Degrees,f,Sine_Pattern);
   #endif  
//--------------------------------------------------------------------------------- 
   if (sec_div>=1000)   // 1ms
    temp=0;
   else if (sec_div>=100)
    temp=1;
   else
    temp=0;
    SetCtrlAttribute (panelHandle, PANEL_GRAPH, ATTR_XPRECISION, temp);  // 小数点位数

//---------------------------------------------------------------------------------   
   gain=(double)sec_div/(double)SAMPLES_TOTAL;
   if (sec_div>=1000)      // 1ms
    gain/=100;
   else if (sec_div>=100)   // 0.1ms
    gain/=100;
   else
    gain*=10;
    
   SetCtrlAttribute (panelHandle, PANEL_GRAPH, ATTR_XAXIS_GAIN,gain); // X轴数字显示的放大倍数
   SetCtrlAttribute (panelHandle, PANEL_GRAPH, ATTR_XDIVISIONS, NUM_DIV);  // X轴的分格数，总是10格，看起来好看一些
  
 //---------------------------------------------------------------------------------   
   SetAxisScalingMode(panelHandle,PANEL_GRAPH,VAL_BOTTOM_XAXIS,VAL_MANUAL,0,SAMPLES_TOTAL);  // 设置X轴的最小值，最大值
   
       DeleteGraphPlot (panelHandle, PANEL_GRAPH, -1, 1);
       PlotY (panelHandle, PANEL_GRAPH, Sine_Pattern,Number_of_Elements, VAL_DOUBLE, VAL_THIN_LINE, VAL_EMPTY_SQUARE, VAL_SOLID, 1, VAL_RED);

   free(Sine_Pattern);   // 释放内存
   break;
  } 
 }
 return 0;
}
//*****************************************************************************
//*****************************************************************************
//*****************************************************************************