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  • Coordinates
  • Using the drawing functions
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Stored procedures
Draws a point:
  • in an Image control,
  • Versions 17 and later
    Reports and QueriesWindows in an Image variable.
    New in version 17
    Reports and QueriesWindows in an Image variable.
    Reports and QueriesWindows in an Image variable.
    in an Image variable.
// Initialize the drawing in an Image control
dStartDrawing(IMG_Drawing)

// Draw a point in light yellow
dPoint(10, 50, LightYellow)
Versions 24 and later
Reports and Queries
// Draw a point in light yellow
dPoint(IMG_Drawing, 10, 50, LightYellow)
New in version 24
Reports and Queries
// Draw a point in light yellow
dPoint(IMG_Drawing, 10, 50, LightYellow)
Reports and Queries
// Draw a point in light yellow
dPoint(IMG_Drawing, 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 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 an Image variable.
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 an Image variable.
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 an Image variable.
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 corresponds to:
If this parameter is not specified, the color of the point:
  • is Transparent if dPen was not 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.
Note: This opacity will be taken into account if the drawing found in the image was initialized with the dWithOpacity constant (dStartDrawing).
Remarks

Coordinates

The coordinates are specified in relation to the top left corner of the Image control (coordinates set to (0, 0)).

Using the drawing functions

The drawing functions can be used according to 2 methods:
  • Method 1: Using dDrawing
    • dStartDrawing must be called before any other drawing function. dStartDrawing is used to define the element (Image control or Image variable) onto 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. dStartDrawing becomes useless.
    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. dStartDrawing becomes useless.
    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. dStartDrawing becomes useless.
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
Component : wd240pnt.dll
Minimum version required
  • Version 9
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