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PolyBtn, a polygon button class

, 23 Feb 2003 163.1K 2.7K 99
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Another non-rectangular button class.
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Sample Image - polybtn.gif

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Introduction

CPolyBtn is a simple CButton derivative that allows you to create buttons that aren't rectangles or circles or any other typical geometric shape; with CPolyBtn, you specify the button shape by providing a series of points that define a polygon.

What can it do?

CPolyBtn does all of the normal button stuff: rollovers, bitmaps, tooltips, focus colors, fill colors, disabled colors, etc..

How can I use it?

You create a button on your dialog, then create a member variable of type CPolyBtn. You know, the standard stuff. Then, in your CDialog's InitInstance, before calling CDialog::InitInstance you create a std::vector of CPoint objects, one for each polygon point, where the points are arranged in clockwise order, then assign the vector to the CPolyBtn. CPolyBtn will determine highlight and shadow colors for each edge, set up the regions and handle everything else.
   // make a triangle button
   std::vector<CPoint> pts;

   const int triEdgeSize = 16;

   pts.push_back(CPoint(0,0));
   pts.push_back(CPoint(triEdgeSize,0));
   pts.push_back(CPoint(0,triEdgeSize));

   m_zoomInBtn.SetPoints(pts);
   m_zoomInBtn.SetBMPOffset(2,2);
   m_zoomInBtn.SetBMPID(IDB_ZOOM_IN, RGB(255,255,255), IDB_ZOOM_IN_DISABLED, <BR>                        RGB(255,255,255));

At this point, you can also add bitmaps, set text positions, etc..

For those of you who demand control, CPolyBtn also provides a way for you to specify the colors for each edge manually (normal, highlight, focused, disabled, etc..). This method takes more work, of course. But if you need that much control, the option is there.

Other options

// optionally set the colors used.
void SetColors(COLORREF highlight, COLORREF down, COLORREF focus, <BR>               COLORREF disabled, COLORREF rollover);
 
// set the color to fill with. default ::GetSysColor(COLOR_BTNFACE);
void SetFillColor(COLORREF fillClr);
  
// draw bitmap at this offset
void SetBMPOffset(int x, int y);
  
// draw window text at this offset
void SetTextOffset(int x, int y);
 
// optional tooltip
void SetTooltipText(LPCTSTR lpszText, BOOL bActivate = TRUE);
void ActivateTooltip(BOOL bEnable = TRUE);
 
// when using the SetPoints method, you can decide to highlight lines 
// that are more than -45 degrees below horizontal (default false)
void AllowHighlightOnGtrNeg45(bool b);
 
// should the button change color when the mouse moves over ? (default false)
void AllowRollover(bool b);

Issues

In general, I'm not crazy about the way the edges are drawn. Because there's no good way to shrink a polygon, it's hard to draw the button edge like a normal button where the edges are actually two parallel lines, with different colors. So, the edges here are always a single pixel wide. Another example of where this is an issue is in the "focus" rendering: normally, button focus is indicated by drawing a dashed rectangle inside the border. But, since there's no simple way to determine what 'inside' means for all arbitrary polygons, CPolyBtn doesn't bother; it handles focus by drawing the edges with the PS_DOT pen style. (sure, there are complex ways to find the inside of a polygon, but that's more work than i wanted to put into this, and i didn't need it anyway).

Anyway...

If you come up with any improvements on this, feel free to share!

And remember, be excellent to each other.

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

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About the Author

Chris Losinger
Software Developer
United States United States
Chris Losinger is the president of Smaller Animals Software, Inc..

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Comments and Discussions

 
GeneralMy vote of 1 Pin
Bill SerGio, The Infomercial King30-Aug-11 4:37
memberBill SerGio, The Infomercial King30-Aug-11 4:37 
GeneralProblem with resizing the buttons Pin
Lexaja8319-Jun-07 4:53
memberLexaja8319-Jun-07 4:53 
GeneralHelp Pin
Snowbluey6-Mar-06 13:04
memberSnowbluey6-Mar-06 13:04 
GeneralEasy to use. Pin
ColinDavies17-Jul-04 18:22
memberColinDavies17-Jul-04 18:22 
GeneralHelp me Pin
ChuThaiDuong25-Apr-04 23:43
memberChuThaiDuong25-Apr-04 23:43 
GeneralCreating regions Pin
muzzle_flash29-Oct-03 7:45
membermuzzle_flash29-Oct-03 7:45 
GeneralRe: Creating regions Pin
Chris Losinger29-Oct-03 7:55
memberChris Losinger29-Oct-03 7:55 
GeneralHelp Pin
BoscoW23-Mar-03 5:42
memberBoscoW23-Mar-03 5:42 
GeneralRe: Help Pin
Chris Losinger23-Mar-03 5:45
memberChris Losinger23-Mar-03 5:45 
GeneralRe: Help Pin
BoscoW23-Mar-03 6:38
memberBoscoW23-Mar-03 6:38 
GeneralRe: Help Pin
Chris Losinger23-Mar-03 6:39
memberChris Losinger23-Mar-03 6:39 
this doesn't look like a problem that CPolyBtn would cause. Unsure | :~

does the problem happen if you remove the CPolyBtn variables ?



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GeneralRe: Help Pin
BoscoW23-Mar-03 9:29
memberBoscoW23-Mar-03 9:29 
GeneralRe: Help Pin
Chris Losinger23-Mar-03 15:19
memberChris Losinger23-Mar-03 15:19 
GeneralGood one! Pin
Kant24-Feb-03 11:16
memberKant24-Feb-03 11:16 
GeneralRe: Good one! Pin
Chris Losinger24-Feb-03 11:49
memberChris Losinger24-Feb-03 11:49 
GeneralRe: Good one! Pin
Kant24-Feb-03 12:23
memberKant24-Feb-03 12:23 
QuestionHow much spare time? Pin
Philip Fitzsimons24-Feb-03 9:25
memberPhilip Fitzsimons24-Feb-03 9:25 
AnswerRe: How much spare time? Pin
Chris Losinger24-Feb-03 9:28
memberChris Losinger24-Feb-03 9:28 
GeneralRe: How much spare time? Pin
Philip Fitzsimons24-Feb-03 9:33
memberPhilip Fitzsimons24-Feb-03 9:33 
GeneralRe: How much spare time? Pin
Chris Losinger24-Feb-03 9:38
memberChris Losinger24-Feb-03 9:38 
GeneralRe: How much spare time? Pin
Philip Fitzsimons24-Feb-03 9:45
memberPhilip Fitzsimons24-Feb-03 9:45 

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