|
|
|
|
- Using the drawing functions
dPen (Function) In french: dStylo Declares the default color and style for the lines, rectangles, circles, ... found: - in an Image control,
- in a variable of type Image.
// Initialize the drawing in an Image control dStartDrawing(IMG_Drawing) // Declare the default color and style for the different lines dPen(LightGreen, 3) Syntax
dPen([<Image>, ] <Color> [, <Line style> [, <Line thickness> [, <Opacity>]]])
<Image>: Optional control name or optional Image, WDPic or picLayer variable
<Color>: Integer or constant Default color for the different lines. This color can correspond to:- an RGB color (returned by RGB),
- an HSL color (returned by HSL),
- a WLanguage preset color.
- a variable of type Color. In this case, the opacity specified in the variable is taken into account.
<Line style>: Optional integer Default style for the different lines:- 0 (by default): Solid line
- 1: Dash (---)
- 2: Dotted line (...)
- 3: Dot and dash (-.-.-)
- 4: Dash and two dots (-..-..-)
- 5: Invisible line
<Line thickness>: Optional integer Thickness of the line in pixels (1 by default). <Opacity>: Optional integer Opacity of color, included between 0 (transparent) and 255 (opaque). An opacity set to 128 is used to blend 50% of the color with the existing color found in the control.Remarks: - This opacity will be taken into account if the drawing in the Image control has been initialized with the dWithOpacity constant (dStartDrawing).
- If the <Color> parameter corresponds to a variable of type Color, this parameter must not be specified: the opacity specified in the variable will be taken into account.
Remarks 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
This page is also available for…
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|