dPoint (Function)

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Using the drawing functions

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dPoint (Function)

In french: dPoint

Draws a point:

in an Image control,
in a variable of type Image.

Example

See additional examples

// Initialise le dessin dans un champ Image
dStartDrawing(IMG_Dessin)
// Dessin d'un point jaune clair
dPoint(10, 50, LightYellow)

// Dessin d'un point jaune clair dans un champ Image
dPoint(IMG_Dessin, 10, 50, LightYellow)

Syntax

Drawing a point by specifying its coordinates Hide the details

dPoint([<Image>, ] <X-coordinate> , <Y-coordinate> [, <Point color> [, <Opacity>]])

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

Image to use. This image can correspond to:
the name of an Image control.
the name of a variable of type Image.
If this parameter is not specified, it is necessary to define the drawing destination with dStartDrawing.

<X-coordinate>: Integer

Horizontal position (in pixels) of the point to draw.

<Y-coordinate>: Integer

Vertical position (in pixels) of the point to draw.

<Point color>: Integer or constant (optional)

Color that must be assigned to the point. This color can correspond to:
an RGB color (returned by RGB),
an HSL color (returned by HSL),
a WLanguage preset color.
If this parameter is not specified, the color of the point:
is Transparent if dPen has not been used beforehand,
corresponds to the color specified in the last call to dPen.

<Opacity>: Optional integer

Opacity of color, included between 0 (transparent) and 255 (opaque). An opacity sets to 128 indicates that the relevant pixel will have a transparency of 50% when it is drawn on the screen or saved in an image in PNG format.
Remark: This opacity will be taken into account if the drawing in the image has been initialized with the constant dWithOpacity (function dStartDrawing)..

Drawing a point via a Point variable Hide the details

dPoint([<Image>, ] <Point> [, <Point color> [, <Opacity>]])

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

Image to use. This image can correspond to:
the name of an Image control.
the name of a variable of type Image.
If this parameter is not specified, it is necessary to define the drawing destination with dStartDrawing.

<Point>: Point variable

Name of the Point variable containing the coordinates of the point to draw.

<Point color>: Integer or constant (optional)

Color that must be assigned to the point. This color can correspond to:
an RGB color (returned by RGB),
an HSL color (returned by HSL),
a WLanguage preset color.
If this parameter is not specified, the color of the point:
is Transparent if dPen has not been used beforehand,
corresponds to the color specified in the last call to dPen.

<Opacity>: Optional integer

Opacity of color, included between 0 (transparent) and 255 (opaque). An opacity sets to 128 indicates that the relevant pixel will have a transparency of 50% when it is drawn on the screen or saved in an image in PNG format.
Remark: This opacity will be taken into account if the drawing in the image has been initialized with the constant dWithOpacity (function dStartDrawing)..

Remarks

Coordinates

Coordinates are specified with respect to the upper-left corner of the image (coordinates: (0.0)).

Using the drawing functions

The drawing functions can be used according to 2 methods:

Method 1: Using the dDrawingStartfunction
- 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.
    If function dEndDrawing is called in the same process as function dStartDrawing, the drawing will not appear: it will be automatically deleted.
Method 2: Indicate the design destination 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: wd300pnt.dll