YOU CAN CODE!

 

With The Case Of UCanCode.net  Release The Power OF  Visual C++ !   HomeProducts | PurchaseSupport | Downloads  
Download Evaluation
Pricing & Purchase?
E-XD++Visual C++/ MFC Products
Overview
Features Tour 
Electronic Form Solution
Visualization & HMI Solution
Power system HMI Solution
CAD Drawing and Printing Solution

Bar code labeling Solution
Workflow Solution

Coal industry HMI Solution
Instrumentation Gauge Solution

Report Printing Solution
Graphical modeling Solution
GIS mapping solution

Visio graphics solution
Industrial control SCADA &HMI Solution
BPM business process Solution

Industrial monitoring Solution
Flowchart and diagramming Solution
Organization Diagram Solution

Graphic editor Source Code
UML drawing editor Source Code
Map Diagramming Solution

Architectural Graphic Drawing Solution
Request Evaluation
Purchase
ActiveX COM Products
Overview
Download
Purchase
Technical Support
  General Q & A
Discussion Board
Contact Us

Links

Get Ready to Unleash the Power of UCanCode .NET


UCanCode Software focuses on general application software development. We provide complete solution for developers. No matter you want to develop a simple database workflow application, or an large flow/diagram based system, our product will provide a complete solution for you. Our product had been used by hundreds of top companies around the world!

"100% source code provided! Free you from not daring to use components because of unable to master the key technology of components!"


Lines, CDC, MoveTo, LineTo

 

A line is a junction of two points. This means that a line has a beginning and an end:

Line

The beginning and the end are two distinct points that can be either POINT, CPoint, or a mix of a POINT and a CPoint values. In real life, before drawing, you should define where you would start. To help with this, the CDC class provides the MoveTo() method. It comes in two versions that are:

CPoint MoveTo(int x, int y);
CPoint MoveTo(POINT point);

The origin of a drawing is specified as a CPoint value. You can provide its horizontal and vertical measures as x and y or you can pass it as a POINT or a CPoint value.

To end the line, you use the CDC::LineTo() method. It comes it two versions declared as follows:

BOOL LineTo(int x, int y);
BOOL LineTo(POINT point);

The end of a line can be defined by its horizontal (x) and its vertical measures (y). It can also be provided as a POINT or a CPoint value. The last point of a line is not part of the line. The line ends just before reaching that point.

Here is an example that draws a line starting at a point defined as (10, 22) coordinates and ending at (155, 64):

void CExoView::OnDraw(CDC* pDC)
{
    pDC->MoveTo(10, 22);
    pDC->LineTo(155, 64);
}
Line Drawing

We have mentioned that the CDC::MoveTo() method is used to set the starting position of a line. When using LineTo(), the line would start from the MoveTo() point to the LineTo() end. As long as you do not call MoveTo(), any subsequent call to LineTo() would draw a line from the previous LineTo() to the new LineTo() point. You can use this property of the LineTo() method to draw various lines. Here is an example:

void CExoView::OnDraw(CDC* pDC)
{
	pDC->MoveTo(60, 20);
	pDC->LineTo(60, 122);
	pDC->LineTo(264, 122);
	pDC->LineTo(60, 20);
}
Multiple lines
 

Practical Learning: Drawing Lines

 
  1. Start Microsoft Visual C++ and create a Single Document application called GDI1 and based on the CView class
  2. Access the OnPaint event of your view class and implement it as follows:
     
    void CView1View::OnPaint() 
    {
    	CPaintDC dc(this); // device context for painting
    	
    	// TODO: Add your message handler code here
    	CPoint PtLine[] = { CPoint( 50,  50), CPoint(670,  50),
    			  CPoint(670, 310), CPoint(490, 310),
    			  CPoint(490, 390), CPoint(220, 390),
    			  CPoint(220, 310), CPoint( 50, 310), 
    			  CPoint( 50,  50) };
    
    	dc.MoveTo(PtLine[0]);
    	dc.LineTo(PtLine[1]);
    	dc.LineTo(PtLine[2]);
    	dc.LineTo(PtLine[3]);
    	dc.LineTo(PtLine[4]);
    	dc.LineTo(PtLine[5]);
    	dc.LineTo(PtLine[6]);
    	dc.LineTo(PtLine[7]);
    	dc.LineTo(PtLine[8]);
    	// Do not call CView::OnPaint() for painting messages
    }
  3. Test the application

 

 

Copyright ?1998-2009 UCanCode.Net Software , all rights reserved.
Other product and company names herein may be the trademarks of their respective owners.

Please direct your questions or comments to webmaster@ucancode.net