PC SOFT

ONLINE HELP
 WINDEVWEBDEV AND WINDEV MOBILE

Home | Sign in | English EN
This content has been translated automatically. Click here to view the French version.
  • Coordinates of the arc
  • Drawing a solid figure
  • Using the drawing functions
  • Pattern and PHP
WINDEV
WindowsLinuxUniversal Windows 10 AppJavaReports and QueriesUser code (UMC)
WEBDEV
WindowsLinuxPHPWEBDEV - Browser code
WINDEV Mobile
AndroidAndroid Widget iPhone/iPadApple WatchUniversal Windows 10 AppWindows Mobile
Others
Stored procedures
Draws an arc of circle or an arc of ellipse:
  • in an Image control,
  • in an Image variable.
    PHP This type of variable is not available.

The arc is drawn anticlockwise.
Versions 16 and later
Android This function is now available for Android applications.
New in version 16
Android This function is now available for Android applications.
Android This function is now available for Android applications.
Versions 17 and later
iPhone/iPad This function is now available for iPhone/iPad applications.
New in version 17
iPhone/iPad This function is now available for iPhone/iPad applications.
iPhone/iPad This function is now available for iPhone/iPad applications.
Versions 18 and later
Universal Windows 10 App This function is now available in Windows Store apps mode.
New in version 18
Universal Windows 10 App This function is now available in Windows Store apps mode.
Universal Windows 10 App This function is now available in Windows Store apps mode.
Versions 21 and later
Universal Windows 10 App This function is now available in Universal Windows 10 App mode.
New in version 21
Universal Windows 10 App This function is now available in Universal Windows 10 App mode.
Universal Windows 10 App This function is now available in Universal Windows 10 App mode.
Versions 24 and later
Android The syntax that manages the Color type is now available for Android applications.
Java The syntax that manages the Color type is now available for Java applications.
New in version 24
Android The syntax that manages the Color type is now available for Android applications.
Java The syntax that manages the Color type is now available for Java applications.
Android The syntax that manages the Color type is now available for Android applications.
Java The syntax that manages the Color type is now available for Java applications.
// Initialize the drawing in the Image control IMG_MyDrawing
dStartDrawing(IMG_MyDrawing)
 
// Draw an arc of circle in light yellow
dArc(10, 10, 50, 50, 20, 20, 40, 50, LightYellow)
Universal Windows 10 AppAndroidiPhone/iPadJavaUser code (UMC)
// Draw a light yellow arc of circle in IMG_MyDrawing
dArc(IMG_MyDrawing,10, 10, 50, 50, 20, 20, 40, 50, LightYellow)
Syntax

Drawing an arc Hide the details

dArc([<Image>, ] <X1> , <Y1> , <X2> , <Y2> , <X3> , <Y3> , <X4> , <Y4> [, <Line color> [, <Line thickness>]])
<Image>: Optional control name or optional Image, WDPic or picLayer variable
Universal Windows 10 AppAndroidiPhone/iPadJavaUser code (UMC) Image to use. This image can correspond to:
  • the name of an Image control.
  • on behalf of an Variable of type Image.
If this parameter is not specified, it is necessary to define the drawing destination with dStartDrawing.
<X1>: entier
X coordinate (in pixels) of top left corner of the rectangle containing the circle.
<Y1>: entier
Y coordinate (in pixels) of top left corner of the rectangle containing the circle.
<X2>: entier
X coordinate (in pixels) of bottom right corner of the rectangle containing the circle.
<Y2>: entier
Y coordinate (in pixels) of bottom right corner of the rectangle containing the circle.
<X3>: entier
X coordinate (in pixels) of start point of the arc of circle.
<Y3>: entier
Y coordinate (in pixels) of start point of the arc of circle.
<X4>: entier
X coordinate (in pixels) of end point of the arc of circle.
<Y4>: entier
Y coordinate (in pixels) of end point of the arc of circle.
<Line color>: Integer or constant (optional)
Color of the arc of circle. This color can correspond to:If this parameter is not specified, the line color:
  • is Transparent if dPen has not been used beforehand,
  • corresponds to the Color specified in the last call to the dPen function..
<Line thickness>: Optional integer
Universal Windows 10 AppAndroidiPhone/iPadJava Thickness (in pixels) of the arc of circle to draw. If this parameter is not specified, the value taken into account can be:
  • the last value specified in the last call to dPen.
  • 1 if dPen was not used beforehand.
Versions 25 and later
AndroidJava This parameter is now available.
New in version 25
AndroidJava This parameter is now available.
AndroidJava This parameter is now available.
Remarks

Coordinates of the arc

If the start and end points 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).
Coordinates of the arc
The origin considered to calculate the coordinates corresponds to the top left corner of the Image (coordinates (0,0)).

Drawing a solid figure

To draw a solid figure (a full arc), use dChord or dSlice.

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
    Universal Windows 10 AppAndroidiPhone/iPadJavaUser code (UMC) 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
    AndroidJava This syntax is now available.
    New in version 25
    AndroidJava This syntax is now available.
    AndroidJava This syntax is now available.
    New in version 24
    Universal Windows 10 AppAndroidiPhone/iPadJavaUser code (UMC) 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
    AndroidJava This syntax is now available.
    New in version 25
    AndroidJava This syntax is now available.
    AndroidJava This syntax is now available.
    Universal Windows 10 AppAndroidiPhone/iPadJavaUser code (UMC) 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
    AndroidJava This syntax is now available.
    New in version 25
    AndroidJava This syntax is now available.
    AndroidJava This syntax is now available.
PHP

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.
Limitation for dArc: The opacity defined by dBackground is ignored.
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: wd260pnt.dll
Minimum version required
  • Version 9
This page is also available for…
Comments
Click [Add] to post a comment