dSlice (Function)

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dSlice (Function)

In french: dPortion

Draws a circle section or an ellipse section:

in an Image control,
in an Image variable.
This type of variable is not available.
Versions 25 and later
in a WDPic variable (on the background layer),
New in version 25
in a WDPic variable (on the background layer),
in a WDPic variable (on the background layer),
Versions 25 and later
in a picLayer variable.
New in version 25
in a picLayer variable.
in a picLayer variable.

Versions 15 and later

This function is now available for WEBDEV sites in Linux.

Caution: A specific configuration is required to use this function in Linux. See The drawings for more details.

New in version 15

This function is now available for WEBDEV sites in Linux.

Caution: A specific configuration is required to use this function in Linux. See The drawings for more details.

This function is now available for WEBDEV sites in Linux.

Caution: A specific configuration is required to use this function in Linux. See The drawings for more details.

Versions 16 and later

This function is now available for Android applications.

This function is now available in Browser code.

New in version 16

This function is now available for Android applications.

This function is now available in Browser code.

This function is now available for Android applications.

This function is now available in Browser code.

Versions 17 and later

This function is now available for iPhone/iPad applications.

New in version 17

This function is now available for iPhone/iPad applications.

Versions 18 and later

This function is now available in Windows Store apps mode.

New in version 18

This function is now available in Windows Store apps mode.

Versions 21 and later

This function is now available in Universal Windows 10 App mode.

New in version 21

This function is now available in Universal Windows 10 App mode.

Example

See additional examples

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

// Draw a circle section whose
// background is light yellow and whose border is light blue
dSlice(10, 10, 50, 50, 20, 20, 40, 50, LightYellow, LightBlue)

Versions 24 and later

// Draw a circle section whose
// background is light yellow and whose border is light blue
dSlice(IMG_Drawing, 10, 10, 50, 50, 20, 20, 40, 50, LightYellow, LightBlue)

New in version 24

// Draw a circle section whose
// background is light yellow and whose border is light blue
dSlice(IMG_Drawing, 10, 10, 50, 50, 20, 20, 40, 50, LightYellow, LightBlue)

Syntax

dSlice([<Image>, ] <X1> , <Y1> , <X2> , <Y2> , <X3> , <Y3> , <X4> , <Y4> [, <Background color> [, <Line color>]])

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

Versions 24 and later
Image to use. This image can correspond to:
the name of an Image control.
on behalf of an Variable of type Image.
Versions 25 and later
on behalf of an Variable of type WDPic. Only the background layer will be handled.
New in version 25
on behalf of an Variable of type WDPic. Only the background layer will be handled.
on behalf of an Variable of type WDPic. Only the background layer will be handled.
Versions 25 and later
the name of a picLayer variable.
New in version 25
the name of a picLayer variable.
the name of a picLayer variable.
If this parameter is not specified, it is necessary to define the drawing destination with dStartDrawing.
New in version 24
Image to use. This image can correspond to:
the name of an Image control.
on behalf of an Variable of type Image.
Versions 25 and later
on behalf of an Variable of type WDPic. Only the background layer will be handled.
New in version 25
on behalf of an Variable of type WDPic. Only the background layer will be handled.
on behalf of an Variable of type WDPic. Only the background layer will be handled.
Versions 25 and later
the name of a picLayer variable.
New in version 25
the name of a picLayer variable.
the name of a picLayer variable.
If this parameter is not specified, it is necessary to define the drawing destination with dStartDrawing.
Image to use. This image can correspond to:
the name of an Image control.
on behalf of an Variable of type Image.
Versions 25 and later
on behalf of an Variable of type WDPic. Only the background layer will be handled.
New in version 25
on behalf of an Variable of type WDPic. Only the background layer will be handled.
on behalf of an Variable of type WDPic. Only the background layer will be handled.
Versions 25 and later
the name of a picLayer variable.
New in version 25
the name of a picLayer variable.
the name of a picLayer variable.
If this parameter is not specified, it is necessary to define the drawing destination with dStartDrawing.

<X1>: entier

X coordinate of top left corner of the rectangle containing the circle. These coordinates are expressed in pixels.

<Y1>: entier

Y coordinate of top left corner of the rectangle containing the circle. These coordinates are expressed in pixels.

<X2>: entier

X coordinate of bottom right corner of the rectangle containing the circle. These coordinates are expressed in pixels.

<Y2>: entier

Y coordinate of bottom right corner of the rectangle containing the circle. These coordinates are expressed in pixels.

<X3>: entier

X coordinate of start point of the circle section. These coordinates are expressed in pixels.

<Y3>: entier

Y coordinate of start point of the circle section. These coordinates are expressed in pixels.

<X4>: entier

X coordinate of end point of the circle section. These coordinates are expressed in pixels.

<Y4>: entier

Y coordinate of end point of the circle section. These coordinates are expressed in pixels.

<Background color>: Integer or constant (optional)

Background color of circle section. This color can correspond to:
an RGB color (returned by RGB),
an HSL color (returned by HSL),
une preset color of WLanguage,
Versions 22 and later
an Color variable.
New in version 22
an Color variable.
an Color variable.
If this parameter is not specified, the background color:
is Transparent if function dBackground has not been used before,
corresponds to the Color specified in the last call to function dBackground.

<Line color>: Integer or constant (optional)

Color of the line for the circle section. This color can correspond to:
an RGB color (returned by RGB),
an HSL color (returned by HSL),
a preset color of WLanguage,
Versions 22 and later
an Color variable.
New in version 22
an Color variable.
an Color variable.
If this parameter is not specified, the line color:
corresponds to the color specified in the last call to dPen,
is identical to the Color used for the Background if the dPen function has not been used..

Remarks

Coordinates

If the start point and the end point are not located on the border of the circle (or on the border of the ellipse), the point taken into account corresponds to the intersection between the circle and the line that joins the specified point and the center of the rectangle (which means the center of the circle).

The coordinates are given in relation to the top left corner of the image or Image control ((0, 0) coordinates).

The drawing sections are drawn anticlockwise.

Non-solid figure

To draw a non-solid figure (without taking into account the center of the circle), use dChord.

Drawing with opacity or anti-aliasing

In the case of a drawing with opacity (function dStartDrawing with the constant dWithOpacity) or anti-aliasing (function dChangeMode with the constant drawAntiAliasing), the contour is drawn by-Above inside the portion: therefore, the line is partly combined with the inside of the section. If the line is very thick, it will be displayed in two colors.

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
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.
Versions 25 and later
This syntax is now available.
New in version 25
This syntax is now available.
This syntax is now available.
New in version 24
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.
Versions 25 and later
This syntax is now available.
New in version 25
This syntax is now available.
This syntax is now available.
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.
Versions 25 and later
This syntax is now available.
New in version 25
This syntax is now available.
This syntax is now available.

Pattern and PHP

In PHP, the drawing functions are based on the graphic library GD. This library is commonly used by the PHP hosting companies and therefore it is always enabled. The version of the GD library must be version 2.0.28 (or later). This library can be downloaded from the PHP site.

To enable (if necessary) this library locally, the following elements are required:

PHP installed.
the PHP.INI file found in the Windows directory must contain the following line: "extension=php_gd2.dll" (instead of ";extension=php_gd2.dll").
the php_gd2.dll file must exist in the directory of PHP extensions. This directory is defined in the PHP.INI file by the "extension_dir" variable.

Versions 16 and later

Drawing in Browser code

Some drawing functions are available in Browser code. The drawing functions in Browser code are based on the HTML 5 standard. More specifically, these functions are based on the "canvas" tag of HTML 5.

The drawing features in browser code are available for the recent browsers only (supporting the HTML 5 standard). To find out whether the drawing features are proposed by your browser, use DrawingAvailable.

Caution: To use the drawing functions with Internet Explorer 9, the project must include the reference to the DTD file. To do so, the HTML mode must be "HTML 4.01 Transitional + DTD". This option is available in the "Advanced" tab of the description window of project.
Reminder: To open the project description window, go to the "Project" pane, "Project" group and click "Description".

Special case: Drawing in the browser of an Android phone: The browser drawing functions are only available starting with version 3 of Android.

New in version 16

Drawing in Browser code

Special case: Drawing in the browser of an Android phone: The browser drawing functions are only available starting with version 3 of Android.

Drawing in Browser code

Special case: Drawing in the browser of an Android phone: The browser drawing functions are only available starting with version 3 of Android.

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: wd260pnt.dll