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CrossHairN


Unit:SDL_polchart
Class: TPolChart
Declaration: property CrossHair1: TpcCrossHair;
property CrossHair2: TCrossHair;
property CrossHair3: TCrossHair;
property CrossHair4: TCrossHair;

The properties CrossHair1 to CrossHair4 define the form and layout of the four available crosshairs and contain the following sub-properties:

PosRad: double; Radial position.
PosPhi: double; Angular position.
Color: TColor; Color of the crosshair.
Mode: TpcCrossHMode; Defines the layout of the crosshair (chOff... crosshair is switched off, chOrtho... orthogonal lines, chPolar... polar crosshair consisting of circle and radial line)
LineType: TPenStyle; Pen style of the crosshair. LineType may assume one of the following values: psSolid (solid line), psDot (dotted line), psDash (dashed line), psDashDot (dash-dot combinations), psDashDotDot (series of dash-dot-dot combinations). Note that the LineType will be effective only if LineWid is set to 1
LineWid: integer; Line width of the crosshair. Note that lines broader than 1 pixel will always be drawn as solid line, even if LineType is set to some other value.
OnChange: TNotifyEvent; Event triggered when any parameter of the crosshair is changed.

Hint 1: Please note that the visible crosshairs can be dragged interactively if the property MouseAction is set to maDragCrossH.

Hint 2: The crosshairs can also be set up by using the method CrossHairSetup.


Example: This property is used in the following example program (see http://www.lohninger.com/examples.html for downloading the code): poldiag


Last Update: 2012-Oct-20