There is a circle made with the help of canvas method MainForm -> Canvas -> Ellipse(350,100,550,300)
. The question is to change size of canvas by clicking "+" or "-" buttons. Are there any methods?
Change size of canvas by click
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for resizing ellipse:
create some global or Form member variables:
int x0=350,y0=100,x1=550,y1=300;
create some draw function (member to form or not)
for example:
create events on resize and on paint for the main form and add draw(Canvas); call in booth
create on (mouse) click event
X,Y,Shift
holding mouse statex1=X; y1=Y; draw(Canvas);
That is all ... hope I did not make some typo (wrote from memory directly here)
If you need to resize the form then:
x1=X, y1=Y;
doClientWidth=X+32; ClientHeight=Y+32;
SetBounds(Left,Top,X+32,Y+32);
+32
is resize area to ensure you can also enlarging ...[edit1] did miss the +/- buttons (I assumed mouse resize) so here are the buttons
create on + button click event:
leave the existing code as is and add to the event code this
that will enlarge booth semi-axises by 16 on each click
create on - button click event:
code is similar to +
that will shrink booth semi-axises by 16 on each click and stop on size 1
if you need the form to resize then adapt the above code ... like in the on mouse event example