dRectangle (Function)

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dRectangle

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Using the drawing functions

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dRectangle (Function)

In french: dRectangle

Draws a rectangle:

in an Image control,
in a variable of type Image.
in a variable of type WDPic (on the background layer),
in a variable of type picLayer.

Remark: To draw custom rectangles, it is recommended to use dBorder.

Caution: A specific configuration is required to use this function in Linux. For more details, see The drawings.

Example

// Initialize the drawing in an Image control
dStartDrawing(IMG_Drawing)

// Draw a rectangle whose background is light yellow
// and whose border is light blue
dRectangle(10, 10, 50, 50, LightYellow, LightBlue)

// Draw a rectangle whose background is light yellow
// and whose border is light blue
dRectangle(IMG_Drawing, 10, 10, 50, 50, LightYellow, LightBlue)

Syntax

Drawing a rectangle by specifying the coordinates of rectangle Hide the details

dRectangle([<Image>, ] <X1> , <Y1> , <X2> , <Y2> [, <Background> [, <Line>]])

<Image>: Optional control name or optional Image, WDPic or picLayer variable

Image to use. The image can correspond to:
the name of an Image control.
the name of a variable of type Image.
the name of a variable of type WDPic. Only the background layer will be handled.
the name of a variable of type picLayer.
If this parameter is not specified, it is necessary to define the drawing destination with dStartDrawing.

<X1>: Integer

X-coordinate (in pixels) of the upper-left corner of the rectangle.

<Y1>: Integer

Y-coordinate (in pixels) of the upper-left corner of the rectangle.

<X2>: Integer

X-coordinate (in pixels) of the lower-right corner of the rectangle.

<Y2>: Integer

Y-coordinate (in pixels) of the lower-right corner of the rectangle.

<Background>: Integer, constant or Background variable (optional)

Background color of rectangle. This color can be:
an RGB color (returned by RGB),
an HSL color (returned by HSL),
a WLanguage preset color,
a variable of type Color,
transparent if this parameter is not specified and if dBackground has not been used.
Background characteristics:
Background variable. In this case, the gradient defined in the variable is ignored.
characteristics specified in the last call to dBackground if this parameter is not specified.
To use a gradient background color, call dRectangleGradient.

<Line>: Integer, constant or Border variable (optional)

Color of rectangle line. This color can be:
an RGB color (returned by RGB),
an HSL color (returned by HSL),
a WLanguage preset color,
a variable of type Color,
identical to the color used for the background if this parameter is not specified and if dPen has not been used.
Characteristics of the line:
Border variable. In this case, only the following properties are taken into account:
Color: if the property is set to ColorUndefined, the color defined in the last call to dPen is used. If this function has not been used, the background color of the rectangle will be used.
Thickness: if the property is set to ThicknessUndefined, the thickness defined in the last call to dPen is used. If this function has not been used, the thickness will be set to 1.
Line: if the property is set to LineUndefined, the type of line defined in the last call to dPen is used. If this function has not been used, the line will be solid.

characteristics specified in the last call to dPen if this parameter is not specified.

Drawing a rectangle via a Rectangle variable Hide the details

dRectangle([<Image>, ] <Rectangle> [, <Background> [, <Line>]])

<Image>: Optional control name or optional Image, WDPic or picLayer variable

Image to use. The image can correspond to:
the name of an Image control.
the name of a variable of type Image.
the name of a variable of type WDPic. Only the background layer will be handled.
the name of a variable of type picLayer.
If this parameter is not specified, it is necessary to define the drawing destination with dStartDrawing.

<Rectangle>: Rectangle variable

Name of the Rectangle variable that defines the coordinates of the rectangle to draw.

<Background>: Integer, constant or Background variable (optional)

Background color of rectangle. This color can be:
an RGB color (returned by RGB),
an HSL color (returned by HSL),
a WLanguage preset color,
a variable of type Color,
transparent if this parameter is not specified and if dBackground has not been used.
Background characteristics:
Background variable. In this case, the gradient defined in the variable is ignored.
This type of variable is not available.
characteristics specified in the last call to dBackground if this parameter is not specified.
To use a gradient background color, call dRectangleGradient.

<Line>: Integer, constant or Border variable (optional)

Color of rectangle line. This color can be:
an RGB color (returned by RGB),
an HSL color (returned by HSL),
a WLanguage preset color,
a variable of type Color,
identical to the color used for the background if this parameter is not specified and if dPen has not been used.
Characteristics of the line:
Border variable. In this case, only the following properties are taken into account:
Color: if the property is set to ColorUndefined, the color defined in the last call to dPen is used. If this function has not been used, the background color of the rectangle will be used.
Thickness: if the property is set to ThicknessUndefined, the thickness defined in the last call to dPen is used. If this function has not been used, the thickness will be set to 1.
Line: if the property is set to LineUndefined, the type of line defined in the last call to dPen is used. If this function has not been used, the line will be solid.

characteristics specified in the last call to dPen if this parameter is not specified.

Remarks

Coordinates

Coordinates are specified with respect to the upper-left corner of the image or Image control (coordinates: (0,0)).

Using the drawing functions

The drawing functions can be used according to 2 methods:

Method 1: Using dStartDrawing
- dStartDrawing must be called before any other drawing function. dStartDrawing is used to define the element (Image control or variable) to which the drawing functions will be applied.
- When drawing on an Image control:
  - The drawing functions operate on a copy ("bitmap") of the image. You can use the drawing functions of Windows (via API or CallDLL32) but these functions must use the DC (Device Context) returned by dStartDrawing.
  - dEndDrawing and dStartDrawing must not be called in the same process.
    The drawing will not be displayed if dEndDrawing and dStartDrawing are called in the same process: it will be automatically erased.
Method 2: indicating the drawing target directly in the syntax (via a parameter)
The <Image> parameter is used to specify directly the target of the drawing. dStartDrawing becomes useless. This function must be deleted.

Related Examples:

Unit examples (WINDEV): The drawing functions

[ + ] Using the main drawing functions of WINDEV to:
- Initialize an Image control for drawing
- Draw simple shapes
- Write a text into a drawing
- Change the color in a drawing

Business / UI classification: Neutral code

Component: wd270pnt.dll