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| Type
TFPoint = record
X, Y : double;
end;
....
procedure _DrawEllipse(const xfp: array of TFPoint);
var i, j, rad, rad2, estep,
xRot, yRot : integer;
cm, p1, p2, p3, p4, p5 : TPoint;
p3f, p4f, p5f, theta,
aWinkel, bWinkel,
RAngle, r1, r2 : double;
begin
cm := CnvToP(xfp[0]);
p2 := CnvToP(xfp[1]);
p3f := xfp[2].x;
p4f := xfp[3].x;
p5f := xfp[4].x;
r1 := Abs(Radius(cm.x, cm.y, p2.x, p2.y));
r2 := Abs(r1 * p3f);
RAngle := Winkel(xfp[0].X, xfp[0].Y, xfp[1].X, xfp[1].Y) * (PI/180);
aWinkel := p4f;
bWinkel := p5f;
if isZero(bWinkel-aWinkel) then begin
aWinkel := 0;
bWinkel := 360
end;
theta := aWinkel * (PI/180);
// Ellipse (x,y) coordinates [pre-rotation]
p1.x := Round(cm.x + r1*COS(theta));
p1.y := Round(cm.y + r2*SIN(theta));
xRot := Round(cm.x + (p1.x - cm.x)* COS(RAngle)
- (p1.y - cm.y)* SIN(RAngle) );
yRot := Round(cm.y - (p1.x - cm.x)* SIN(RAngle)
- (p1.y - cm.y)* COS(RAngle) );
BCAD.xDraw.Canvas.MoveTo(xRot, yRot);
estep := Trunc(bWinkel - aWinkel);
for j := 1 to estep do begin
theta := (aWinkel+j) * (PI/180);
// Ellipse (x,y) coordinates [pre-rotation]
p1.x := Round(cm.x + r1*COS(theta));
p1.y := Round(cm.y + r2*SIN(theta));
xRot := Round(cm.x + (p1.x - cm.x)* COS(RAngle)
- (p1.y - cm.y)* SIN(RAngle) );
yRot := Round(cm.y - (p1.x - cm.x)* SIN(RAngle)
- (p1.y - cm.y)* COS(RAngle) );
BCAD.xDraw.Canvas.LineTo(xRot, yRot)
end;
theta := bWinkel * (PI/180);
// Ellipse (x,y) coordinates [pre-rotation]
p1.x := Round(cm.x + r1*COS(theta));
p1.y := Round(cm.y + r2*SIN(theta));
xRot := Round(cm.x + (p1.x - cm.x)* COS(RAngle)
- (p1.y - cm.y)* SIN(RAngle) );
yRot := Round(cm.y - (p1.x - cm.x)* SIN(RAngle)
- (p1.y - cm.y)* COS(RAngle) );
BCAD.xDraw.Canvas.LineTo(xRot, yRot);
end; {DrawEllipse} |