# draw some building structures, Canvas in Delphi

Dear all.
I've learned how use Canvas Object for creating basical shape like circle, square, arc and so on.
I am interested in creating 2D shape for drawing house project like this one:

http://www.eioba.pl/files/user598/dompastwakania2sj7.png

So I need to create simple Shape for "desk with chairs", chair, stairs, "L" and "U"walls ....

I could play with the canvas functions and do it by myself by the way i was thinking if
such library or procedure are already bee created by someone else in internet
so I would speed up with my project.

it does exsist a software that generate delphi code for a shape
to be used in my procedure? So i can create my TMyShapeDesk Class?

Thx a lot.
###### Who is Participating?

All-around developerCommented:
Looks like the chair is drawn with 3 ellipses and a round rect, all you need is to calculate the position and sizes.
Remember, TShape is a graphic control and does not respond to mouse messages so you really need to inherit from TComponent and build from there.

AFA No.1 is concerned, all you have to do is draw the two parallel lines at the same time
that is not hard to do. Take the position when the mouse button is pressed and set position 1 to the mouse position + 1/2 the width of the wall, set position 2 to the mouse position - 1/2 the width of the wall. then do the same thing when the button is released and draw lines from position1 to position 3 and position 2 to position 4.
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Commented:
this one helps :   http://www.flex-graphics.com/   ??
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Author Commented:
hmmm probably not because my goal is to find code to use.
I am using TeeTree:

http://www.steema.com/products/teetree/whatsnew.html

But here there are a only a few sample of Shape.

Here an example:

procedure TMyActorShape.DrawShapeCanvas(ACanvas: TCanvas3D; const R: TRect);
var tmpX : Integer;
tmpY : Integer;
tmpY2 : Integer;
tmp : Integer;
begin
inherited;
with R do
begin
tmpX:=(Right+Left) div 2;
tmpY:=(Bottom-Top) div 3;
tmpY2:=(Bottom-Top) div 9;
end;

with ACanvas do
begin
HorizLine3D(R.Left,R.Right,R.Top+tmpY,TeeTreeZ);
VertLine3D(tmpX,R.Top+tmpY-tmpY2,R.Bottom-tmpY,TeeTreeZ);
LineWithZ(tmpX,R.Bottom-tmpY,R.Left,R.Bottom,TeeTreeZ);
LineWithZ(tmpX,R.Bottom-tmpY,R.Right,R.Bottom,TeeTreeZ);
tmp:=(tmpY-tmpY2) div 2;
EllipseWithZ(tmpX-tmp,R.Top,tmpX+tmp,R.Top+tmp+tmp,TeeTreeZ);
end;
end;

So in ACanvas I want to draw my own shape (clouds, desk, tree, gate, doors, windows..).

Thx

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All-around developerCommented:
You really should be using this:
http://www.codeaccelerate.com/drawing_engine.html
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Author Commented:
Hi. I have installed the package, I see all the components in palette but actually I don't
undestand how I could use them in the procedure I showed you before and what advantages
they offer compared with the standard canvas procedures. I need to draw the shape
via code...

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All-around developerCommented:
You need to create shape classes and program them to draw like you want.
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Author Commented:
do you have some example? I see that the documentation is quite poor.
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All-around developerCommented:
Well, I don't know the dimensions or shape that you want to draw. There are examples included of shape classes in the package, I believe, that you can see how to do it.
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Author Commented:
Oki. How you would compare it with this?

http://www.tmssoftware.com/site/diagram.asp?s=
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All-around developerCommented:
That's all fine if you want the objects already created. Apparently, you want some things specially designed and you are going to have to do that yourself.
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Author Commented:
I do undestand. Thanks.

I've attached some picture of what I would like to achive.

1. Have seen the example of how create a mult-iline shape by clicking on the Diagram. Generally I would like to get
the same effect adding some code in my procedure DrawShapeCanvas for drawing a piece of wall as showed in my screenshot
and then fill it with my ow brush or simple color.

2. I would like to create a basical simple shape like TMychair and use them for a table in "conference room". You see
the second pic.  Here you see a red-square around the table which is a TRect type to draw in. (note TMyActorShape
is draggable on Diagram component so when I perform this action all the "shape" in ACanvas should move accordgly (charis, bottle of water :-) , table...)

How I can achive it?
Any code example?

Thx
1.jpg
2.jpg
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All-around developerCommented:
There is a component on the Additional Tab called TShape. Make a copy of the code and modify the Paint to draw a chair, a table,and whatever, like it does with a Square, Rectangle, RoundRect, etc.
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Author Commented:
I know where Tshape is it. I was searching for other kind of information like How paint shapes, graphics algoritms...If someone else
have done it using pascal for exmaple drawing clouds I would look into his code ...

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Author Commented:
My previous question (1 and 2) are also very specific.
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