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  • Coordinates
  • Using the drawing functions
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Stored procedures
Draws a point:
  • in an Image control,
  • in an Image variable.
// Initialise le dessin dans un champ Image
dStartDrawing(IMG_Dessin)
 
// Dessin d'un point jaune clair
dPoint(10, 50, LightYellow)
Versions 24 and later
Reports and Queries
// Dessin d'un point jaune clair dans un champ Image
dPoint(IMG_Dessin, 10, 50, LightYellow)
New in version 24
Reports and Queries
// Dessin d'un point jaune clair dans un champ Image
dPoint(IMG_Dessin, 10, 50, LightYellow)
Reports and Queries
// 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
Versions 24 and later
Reports and QueriesWindows 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.
New in version 24
Reports and QueriesWindows 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.
Reports and QueriesWindows 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>: entier
Horizontal position (in pixels) of the point to draw.
<Y-coordinate>: entier
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:
If this parameter is not specified, the color of the point:
  • is Transparent if the dPen function has not been used before,
  • corresponds to the Color specified in the last call to the dPen function.
<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 found in the image was initialized by the dWithOpacity constant (dStartDrawing).
Remarks

Coordinates

Coordinates are given with respect to the top 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 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.
  • Versions 24 and later
    Reports and QueriesWindows 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. The dStartDrawing function becomes unnecessary. This function must be deleted.
    New in version 24
    Reports and QueriesWindows 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. The dStartDrawing function becomes unnecessary. This function must be deleted.
    Reports and QueriesWindows 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. The dStartDrawing function becomes unnecessary. This function must be deleted.
Related Examples:
The drawing functions 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
Minimum version required
  • Version 9
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