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Unit: SDL_rchart
Class: TContourPlot
Declaration: [1] procedure Rectangle (x1, y1, x2, y2: double);
[2] procedure Rectangle (x1, y1, x2, y2: integer);
[3] procedure Rectangle (x1, y1: integer; x2, y2: double);
[4] procedure Rectangle (x1, y1: double; x2, y2: integer);

The method Rectangle displays a rectangle. The lower left corner and the upper right corner are specified by the positions (x1,y1) and (x2,y2), respectively.

The rectangle can be drawn in different coordinate system modes: version [1] uses the world coordinates (these are the coordinates shown at the axes of the chart), version [2] uses the screen coordinates (pixels), and versions [3] and [4] mix them. Using screen coordinates (which are declared as integer) has the effect that the rectangle remains at a fixed position even if the chart is panned or zoomed. Using mixed mode coordinates ([3] and [4]) allows to implement a "stretching" effect, with one corner of the rectangle staying in place and the other moving with the world coordinate system.

The color of the boundary is determined by the property DataColor; the color of the inner area is specified by the property FillColor. The fill area of the rectangle may be either opaque or transparent, depending on the property TransparentItems. The line width may be adjusted by the property LineWidth.

Hint: In the Light Edition the number of chart elements is restricted to 1000 elements.

Last Update: 2023-Dec-13