sample4_3.c

经典LabWindows CVI方面的教材《LabWindows CVI开发入门和进阶》一书例题1-4章中的源码

#include <cvirte.h>     /* needed if linking executable in external compiler; harmless otherwise */
#include <userint.h>
#include "sample4_3.h"
#include <ansi_c.h>      

static int hPanel;
static int nWidth, nHeight, nLeftDown;
static int nYPos, nXPos, prevCursor;
int Pen_Color;
unsigned short Tool_width;
int pen=1,eraser=0,bucket=0;
void SetTools(int *tool,int control);
int IsClickCtrl (int panel, int control, int x, int y)   ;

int main (int argc, char *argv[])
{
    if (InitCVIRTE (0, argv, 0) == 0)    /* Needed if linking in external compiler; harmless otherwise */
        return -1;    /* out of memory */
    
    if ((hPanel = LoadPanel (0, "sample4_3.uir", PANEL)) < 0)
        return -1;
        
    /* Get default values from the UIR */
    GetCtrlAttribute (hPanel, PANEL_CANVAS, ATTR_WIDTH, &nWidth);
    GetCtrlAttribute (hPanel, PANEL_CANVAS, ATTR_HEIGHT, &nHeight);
    ////
    GetCtrlVal (hPanel, PANEL_COLORNUM, &Pen_Color);
    SetCtrlAttribute (hPanel, PANEL_CANVAS, ATTR_PEN_COLOR, Pen_Color);  
    GetCtrlVal (hPanel, PANEL_NUMERIC, &Tool_width);
    SetCtrlAttribute (hPanel, PANEL_CANVAS, ATTR_PEN_WIDTH, Tool_width);
    
    
    DisplayPanel (hPanel);
    RunUserInterface ();  
    return 0;
}
//timer callback ,do drawing 
int CVICALLBACK TimerDraw (int panel, int control, int event,
        void *callbackData, int eventData1, int eventData2)
{
	switch (event) {
        case EVENT_TIMER_TICK:
            GetRelativeMouseState (hPanel, PANEL_CANVAS, &nXPos, &nYPos,
                                   &nLeftDown, 0, 0);
            if (!nLeftDown)
                SetCtrlAttribute (hPanel, PANEL_TIMER1, ATTR_ENABLED, 0);
            else
            {
            if(pen==1||eraser==1)
                CanvasDrawLineTo (hPanel, PANEL_CANVAS,
                        MakePoint(nXPos, nYPos));
            }
            break;
    }
    return 0;
}
//canvas callback ,set draw tool and start point 
int CVICALLBACK Canvas (int panel, int control, int event,
        void *callbackData, int eventData1, int eventData2)
{
    switch (event) {
        case EVENT_LEFT_CLICK:
            SetCtrlAttribute (hPanel, PANEL_TIMER1, ATTR_ENABLED, 1);
            GetRelativeMouseState (hPanel, PANEL_CANVAS, &nXPos, &nYPos,
                                   0, 0, 0);
            if(pen==1)
            {
             	SetCtrlAttribute (hPanel, PANEL_CANVAS, ATTR_PEN_COLOR, Pen_Color); 
            	SetCtrlAttribute (hPanel, PANEL_CANVAS, ATTR_PEN_WIDTH, Tool_width);  
            	CanvasSetPenPosition (hPanel, PANEL_CANVAS,MakePoint(nXPos, nYPos));
            }
            if(eraser==1)
            {
            	 SetCtrlAttribute (hPanel, PANEL_CANVAS, ATTR_PEN_COLOR, 0xffffff); 
           		 SetCtrlAttribute (hPanel, PANEL_CANVAS, ATTR_PEN_WIDTH, Tool_width+5);  
             	 CanvasSetPenPosition (hPanel, PANEL_CANVAS,MakePoint(nXPos, nYPos)); 
            }
            if(bucket==1)
            {
             	SetCtrlAttribute (hPanel, PANEL_CANVAS,  ATTR_PEN_FILL_COLOR, Pen_Color); 
            	CanvasDimRect (hPanel,PANEL_CANVAS ,MakeRect(0,0,nHeight,nWidth )); 
            }
            	
            break;
    }
    return 0;
}
//get color
int CVICALLBACK Color (int panel, int control, int event,
        void *callbackData, int eventData1, int eventData2)
{
    switch (event) {
        case EVENT_COMMIT:
            GetCtrlVal (hPanel, PANEL_COLORNUM, &Pen_Color);
            SetCtrlAttribute (hPanel, PANEL_CANVAS, ATTR_PEN_COLOR, Pen_Color);
            break;
    }
    return 0;
}
// get Width
int CVICALLBACK width (int panel, int control, int event,
        void *callbackData, int eventData1, int eventData2)
{
    switch (event) {
        case EVENT_COMMIT:
            GetCtrlVal (hPanel, PANEL_NUMERIC, &Tool_width);
            SetCtrlAttribute (hPanel, PANEL_CANVAS, ATTR_PEN_WIDTH, Tool_width);
            break;
    }
    return 0;
}
//exit pro
int CVICALLBACK Quit (int panel, int control, int event,
        void *callbackData, int eventData1, int eventData2)
{
    switch (event) {
        case EVENT_COMMIT:
            QuitUserInterface (0);
            break;
    }
    return 0;
}
//toggle eraser button
int CVICALLBACK Eraser (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	switch (event)
	{
		case EVENT_COMMIT:
			SetTools(&eraser,control);
			break;
	}
	return 0;
}
//toggle pen button      
int CVICALLBACK Pen (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	switch (event)
	{
		case EVENT_COMMIT:
			SetTools(&pen,control); 
			break;
	}
	return 0;
}
//toggle bucket button      
int CVICALLBACK Bucket (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	switch (event)
	{
		case EVENT_COMMIT:
			SetTools(&bucket,control); 
			break;
	}
	return 0;
}
//timer callback ,set cursor according to mouse position and tool style
int CVICALLBACK TimerCursor (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	int nX,nY;
	switch (event)
	{
		case EVENT_TIMER_TICK:
            GetRelativeMouseState (hPanel, PANEL_CANVAS, &nX, &nY,
                                   &nLeftDown, 0, 0);
            if (IsClickCtrl (panel, PANEL_CANVAS, nX, nY))
            {     
            	if(pen==1)    SetMouseCursor (VAL_POINTING_FINGER_CURSOR);
            	if(eraser==1) SetMouseCursor (VAL_BOX_CURSOR);  
            	if(bucket==1) SetMouseCursor (VAL_HOUR_GLASS_CURSOR); 
            }
            else            
				SetMouseCursor (VAL_DEFAULT_CURSOR );  

			break;
	}
	return 0;
}
//toggle tool button fun
void SetTools(int *tool,int control)
{
	SetCtrlVal (hPanel,control, 1);	
	
  	if(pen==1&&control!=PANEL_PEN){
		SetCtrlVal (hPanel, PANEL_PEN, 0);
		pen=0;
	}
	if(eraser==1&&control!=PANEL_ERASER){
		SetCtrlVal (hPanel, PANEL_ERASER, 0);   
  		eraser=0;
  	}
	if(bucket==1&&control!=PANEL_BUCKET){
	    SetCtrlVal (hPanel, PANEL_BUCKET, 0); 
	    bucket=0;
	}
	*tool=1;  
}
//determine whether the mouse is on control
int IsClickCtrl (int panel, int control, int x, int y)
{
    int height, width;
    if ((x < 0) || (y < 0))
        return 0;
    if (control == 0) 
    {
        GetPanelAttribute (panel, ATTR_HEIGHT, &height);
        GetPanelAttribute (panel, ATTR_WIDTH, &width);
    }
    else 
    {
        GetCtrlAttribute (panel, control, ATTR_HEIGHT, &height);
        GetCtrlAttribute (panel, control, ATTR_WIDTH, &width);
    }
    if ((y < height) && (x < width))
        return 1;
    else
        return 0;
}