BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  TImage and Ellipse isn't drawing right          BorlandTalk.com Forum Index -> C++ Builder (Graphics) View previous topic :: View next topic   Author Message Joe Bonavita Guest Posted: Wed Oct 22, 2003 7:51 pm    Post subject: TImage and Ellipse isn't drawing right I want to draw a circle on the Bitmaps canvas using the OnMouseDown like this: pBitmap->Canvas->Brush->Color = clRed; pBitmap->Canvas->Ellipse(X, Y, X + 10, Y + 10); For some reason the circle appears about 20 pixels over and 40 too high. Am I missing something here? Back to top Todd Brylski Guest Posted: Wed Oct 22, 2003 10:31 pm    Post subject: Re: TImage and Ellipse isn't drawing right "Joe Bonavita" <JBonavita_NO_SPAN (AT) Caminus (DOT) com> wrote Quote: I want to draw a circle on the Bitmaps canvas using the OnMouseDown like this: pBitmap->Canvas->Brush->Color = clRed; pBitmap->Canvas->Ellipse(X, Y, X + 10, Y + 10); For some reason the circle appears about 20 pixels over and 40 too high. Am I missing something here? You need to center the ellipse on the X and Y coordinates: pBitmap->Canvas->Brush->Color = clTeal; // Teal is better color than red pBitmap->Canvas->Ellipse( X -5, Y -5, X +5, Y +5 ); Todd Back to top Joe Bonavita Guest Posted: Thu Oct 23, 2003 4:08 pm    Post subject: Re: TImage and Ellipse isn't drawing right Actually the problem was because the image was "zoomed". If I try and draw @ X, Y on the Bitmap->Canvas the dot will go to the location on the bitmap that doesn't match the images' location. When an image is increased or decreased, just the image changes and not the unlaying bitmap therefor using the X, Y doesn't match the bitmap. I'm getting closer but still can't nail it down just right... "Todd Brylski" <tbrylski (AT) yahoo (DOT) com> wrote Quote: "Joe Bonavita" <JBonavita_NO_SPAN (AT) Caminus (DOT) com> wrote I want to draw a circle on the Bitmaps canvas using the OnMouseDown like this: pBitmap->Canvas->Brush->Color = clRed; pBitmap->Canvas->Ellipse(X, Y, X + 10, Y + 10); For some reason the circle appears about 20 pixels over and 40 too high. Am I missing something here? You need to center the ellipse on the X and Y coordinates: pBitmap->Canvas->Brush->Color = clTeal; // Teal is better color than red pBitmap->Canvas->Ellipse( X -5, Y -5, X +5, Y +5 ); Todd Back to top Joe Bonavita Guest Posted: Thu Oct 23, 2003 4:16 pm    Post subject: Re: TImage and Ellipse isn't drawing right Here's the solution when trying to draw on a image that is "zoomed". X1 = X / (double(Image1->Width) / double(Image1->Picture->Width) ); Y1 = Y / (double(Image1->Height) / double(Image1->Picture->Height) ); Image1->Picture->Bitmap->Canvas->Ellipse(X1 - 5, Y1 - 5, X1 + 5, Y1 + 5); this will draw a circle in the location a user clicked the mouse when an image has been stretched. "Joe Bonavita" <JBonavita_NO_SPAN (AT) Caminus (DOT) com> wrote Quote: I want to draw a circle on the Bitmaps canvas using the OnMouseDown like this: pBitmap->Canvas->Brush->Color = clRed; pBitmap->Canvas->Ellipse(X, Y, X + 10, Y + 10); For some reason the circle appears about 20 pixels over and 40 too high. Am I missing something here? Back to top Frank Guest Posted: Fri Oct 24, 2003 4:32 pm    Post subject: Re: TImage and Ellipse isn't drawing right Hi Joe, Maybe use Arc in stead of Ellipse Good luck Frank "Joe Bonavita" <JBonavita_NO_SPAN (AT) Caminus (DOT) com> escribió en el mensaje news:3f96dfb9 (AT) newsgroups (DOT) borland.com... Quote: I want to draw a circle on the Bitmaps canvas using the OnMouseDown like this: pBitmap->Canvas->Brush->Color = clRed; pBitmap->Canvas->Ellipse(X, Y, X + 10, Y + 10); For some reason the circle appears about 20 pixels over and 40 too high. Am I missing something here? Back to top Todd Brylski Guest Posted: Sat Oct 25, 2003 12:09 am    Post subject: Re: TImage and Ellipse isn't drawing right "Frank" <aplicon (AT) terra (DOT) es> wrote Quote: Maybe use Arc in stead of Ellipse Why would he want to use an arc when he wants to draw an ellipse? 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