Steema Central

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I have designed a solution to overcome the overlap of logarithmic axis
labels.
It's far from being perfect but may be useful.

All changes made in teeengine unit


Added a tlist to tchartaxis object in teeengine unit

    FLogLabelPosList : TList;

in create axis
    FLogLabelPosList :=TList.create;

in destroy
    FLogLabelPosList.free;

in Tchartaxis.draw
    FLogLabelPosList.clear; (must be the first line)

in InternalDrawLabel

original line was
    if FLabels then DrawThisLabel(tmp,LabelValue(tmpValue))

I changed it to
    if FLabels then
      Begin
        if Flogarithmic then {check if axis is logarithmic)
        Begin
                drawit:=true;
                for i:=1 to FLogLabelPosList.count do {check if label
overlaps with previous drawn labels}
                Begin
                        if
(tmp<=Integer(FLogLabelPosList[i-1])+Fparentchart.canvas.textheight('1'))
and
                        (tmp>=Integer(FLogLabelPosList[i-1])) then
                        Begin
                                Drawit:=false; {if overlaps do not draw the
label}
                                break;
                        ENd;
                End;
                if drawit then
                Begin
                        FLogLabelPosList.Add(Pointer(tmp)); {add the label
to drawn label list}
                        DrawThisLabel(tmp,LabelValue(tmpValue));
                ENd;
        End
        else
                DrawThisLabel(tmp,LabelValue(tmpValue))
     End;