canvas - Delphi FireMonkey app can not draw simple black rectangle -


just create simple firemokey hd app, put timage align=alclient on form , trying draw simple black rect:

procedure tform8.formcreate(sender: tobject); var   c: tcanvas; begin   image.bitmap := tbitmap.create(clientwidth, clientheight);   c := image.bitmap.canvas;   c.beginscene;   try     c.clear(clawhite);     c.stroke.color := clablack;     c.stroke.kind := tbrushkind.bksolid;     c.drawrect(       trectf.create(7,7,clientwidth-7,clientheight-7),       0,0,       [],       1     );       c.endscene;   end; end;

and doesn't work. color of rect not black, kind of gray. there changes of color in corners. did need set other properties or wrong here ? tried different opacity values (1,100,255,65535), picture doesn't change @ , there no information in hell option means. zoomed left-top corner:

enter image description here

also tried use polygons described in example. same problem - rounded corners , gray color instead of black (opacity property of image 1, properties default):

procedure tform8.button2click(sender: tobject); var   p1, p2, p3, p4, p5: tpointf;   mypolygon: tpolygon; begin   // sets points define polygon   p1.create(100, 100);   p2.create(200, 100);   p3.create(200, 200);   p4.create(100, 200);   p5.create(100, 100);   // creates polygon   setlength(mypolygon, 5);   mypolygon[0] := p1;   mypolygon[1] := p2;   mypolygon[2] := p3;   mypolygon[3] := p4;   mypolygon[4] := p5;   image.bitmap.canvas.beginscene;   // draws polygon on canvas   image.bitmap.canvas.drawpolygon(mypolygon, 50);   image.bitmap.canvas.endscene;   // updates bitmap //  image.bitmap.bitmapchanged;  end;

http://roman.yankovsky.me/?p=1018

if canvas.beginscene try   canvas.stroke.thickness := 1.5;   canvas.stroke.kind := tbrushkind.bksolid;   canvas.fill.color := talphacolorrec.black;   canvas.fill.kind := tbrushkind.bksolid;    := 1 9   begin     canvas.drawline(pointf(50 + * 25 - (canvas.stroke.thickness / 2), 0),       pointf(50 + * 25 - (canvas.stroke.thickness / 2), clientheight), 1);   end;   canvas.endscene; end;

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