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# About convert Point from Region

Posted on 1998-11-05
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Can  convert QickDraw Region to QickDraw Point?.
Can PtInRgn()-function only use ?.
0
Question by:nekoman

LVL 3

Accepted Solution

boonstra earned 100 total points
ID: 1291579
Clearly, you cannot convert a Region to a single Point, because a Region would include many Points.  Perhaps the question is if you can convert a Region to an array of Points.  There is no function to do that.  However, you could convert a Region to a BitMap using the functions FillRgn or PaintRgn.  You could loop thru the bitmap to create points if you wanted to.

Note that you can easily get the bounding box for a RgnHandle rgnHdl by looking at the Rect at (**rgnHdl).rgnBBox

As for what other functions you might be able to use, the function RectInRgn tests whether any point in a Rect is inside a Region.  EmptyRgn tests to see if a region is empty.  DiffRgn calculates the area where two regions do not overlay.  UnionRgn calculates the union of two regions, and XorRgn calculates the union minus the overlap, and SectRgn calculates the intersection.

If I didnt' answer the question, please add a comment and I'll try again.
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Author Comment

ID: 1291580
Thank you.
I analyzed Region.
below..
void NewRegionDraw2(void)
{
Rect            windRect,theRoundRect = { 100,125,200,400};
Rect            theRoundRect2 = { 150,160,200,400};
Rect            theRoundRect3 = { 105,105,200,200};
Rect            theRoundRect4 = { 50,50,200,200};
Rect            theRoundRect5 = { 110,110,115,115};
short *ptr,i,cnt,x,x2,y,Oi,ii,iii,j;
RGBColor color;
RgnHandle gRgn;
gRgn =  NewRgn();
PenSize(1,1);
OpenRgn();
MoveTo(100,100);
//FrameRect(&theRoundRect);
//FrameRect(&theRoundRect2);
//FrameOval(&theRoundRect4);
//      FrameRect(&theRoundRect5);
/*LineTo(50,300);
LineTo(250,300);
LineTo(100,100);*/
FrameOval(&theRoundRect3);
//myErr = BitMapToRegion(Rgn,&bMap);
CloseRgn(gRgn);
HLock((Handle)gRgn);
ptr = (short *)(((char*)*gRgn) + 10);
cnt = (((**gRgn).rgnSize - 10) >> 1);
y = ptr[0] ;
color.red = color.green = color.blue = 0;
RGBForeColor(&color);
for(i =0; i < cnt-1;) {
short wk,wk_y;
Oi = i;
wk_y = ptr[i++] ;
if(i >= 150 ) {
a= 1;
}
while(1) {
MoveTo(ptr[i],wk_y);
i++;
LineTo(ptr[i]-1,wk_y);
i++;
if(ptr[i] == 0x7FFF ) {
i++;
break;
}
}
y = wk_y;
}
color.red = color.green = color.blue = 0;
color.red = 0xFFFF;
RGBForeColor(&color);
FrameRgn(gRgn);
DisposeRgn(gRgn);

//PaintRgn(gRgn);
return;

}

Region Data is
top;
y-
x1-x2
x3-x4....many
0x7FFF --partition
y-
x5-x6
x7-x8....many
0x7FFF --partition
0x7FFF --partition Last

This is incomplete.
Do you know good idea? .
(Apple is no support.--I know.)
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