Image drawing and processing functions

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Image drawing and processing functions

Remark: These functions are also available in prefix syntax (Image drawing and processing functions (prefix syntax)).

Caution: To know the necessary requirements to draw according to the different platforms used, see Drawing in WINDEV, WEBDEV and WINDEV Mobile.

The drawing functions are as follows:


ArrowEnd	Sets the position of the target end of an arrow in a "Shape" control.
ArrowStart	Sets the position of the source end of an arrow in a "Shape" control.
BitmapInfo	Retrieves the characteristics of an image file or the characteristics of a PDF file : format, width and height, number of bits per pixel.
ColorHue	Calculates the hue of a color.
ColorLightness	Calculates the lightness of a color.
ColorSaturation	Calculates the saturation of a color.
dAlphaBlend	Blends two images together. This allows you to create fade-in effects between 2 images.
dArc	Draws an arc of circle or an arc of ellipse: in an Image control, in an Image variable, in a WDPic variable (on the background layer), in a picLayer variable.
dBackground	Declares the default background color for the rectangles, circles, etc.:: in an Image control, in an Image variable, in a WDPic variable (on the background layer), in a picLayer variable.
dBlur	Blurs the entire given area: in an Image control, in an Image variable, in a WDPic variable (on the background layer), in a picLayer variable.
dBorder	Draws the borders.
dChangeMode	Changes the drawing mode used by the drawing functions (dLine, dRectangle, ....).
dChord	Draws the chord of a circle (intersection between an ellipse and a straight line): in an Image control, in an Image variable, in a WDPic variable (on the background layer), in a picLayer variable.
dCircle	Draws a circle or an ellipse: in an Image control, in an Image variable, in a WDPic variable (on the background layer), in a picLayer variable.
dClear	Clears the content of an Image variable or Image control and fills it with the specified color.
dCopieImageChamp	Copies the image of a control in a WINDEV window to a variable of type Image.
dCopy	Copies an image to another image.
dCopyImage	Copies an image: from an Image control to another Image control. from an Image variable to another Image variable.
dCopyScreenImage	Copies the screen contents to an Image variable or to an Image control.
dCopyWindowImage	Copies the image from a WINDEV window to an Image variable or to an Image control.
dCrop	Returns the cropped part of an image. This image is in an Image variable.
dDisplay	Displays the drawing in the Image control.
dDominantImageColor	Returns the dominant (i.e. most frequent) color of an image in an Image variable or in an Image control.
dEncrustColor	Encrusts a color in an image found in an Image variable].
dEndDrawing	Deletes all the drawings made since the last call to dStartDrawing.
dFill	Colors an area: in an Image control, in an Image variable, in a WDPic variable (on the background layer), in a picLayer variable.
dFont	Declares the font that will be used by dText: in an Image control, in an Image variable, in a WDPic variable (on the background layer), in a picLayer variable.
dHalo	Adds a halo effect on an image found in an Image variable].
dHorizontalSymmetry	Flips an image with respect to a horizontal axis (symmetry with respect to a horizontal axis).
dImageToArray	Copies the RGB pixels of the image into a one-dimensional or two-dimensional array. The array of colors is cleared then it is filled with the integers representing the colors (24 bits) of the image.
dInvertColor	Inverts the colors: in an Image control, in an Image variable, in a WDPic variable (on the background layer), in a picLayer variable.
dLine	Draws a line: in an Image control, in an Image variable, in a WDPic variable (on the background layer), in a picLayer variable.
dLoadImage	Loads an image in an Image variable from a memo, a file or a binary buffer.
dModifyContrast	Changes the contrast of an image contained: in an Image control, in an Image variable.
dModifyHSL	Modifies the hue, the saturation and the lightness of an image found: in an Image control, in an Image variable.
dModifyHue	Changes the hue of an image: in an Image control, in an Image variable.
dModifyLightness	Changes the lightness of an image found: in an Image control, in an Image variable.
dModifyOpacity	Modifies the opacity of an image (which means the alpha channel of the image).
dModifySaturation	Modifies the saturation of an image found: in an Image control, in an Image variable.
dPen	Declares the default color and style for the lines, rectangles, circles, ... found: in an Image control, in an Image variable, in a WDPic variable (on the background layer), in a picLayer variable.
dPixelColor	Identifies the color of a pixel: in an Image control. in an Image variable. in a picLayer variable. in a WDPic variable].
dPixelOpacity	Identifies the opacity of a pixel in an image that has an Alpha channel. This image can be: an Image control, an Image variable, a WDPic variable (on the background layer), a picLayer variable.
dPoint	Draws a point: in an Image control, in an Image variable, in a WDPic variable (on the background layer), in a picLayer variable.
dPolygon	Draws a polygon: in an Image control, in an Image variable, in a WDPic variable (on the background layer), in a picLayer variable.
dPolyline	Draws a line composed of multiple segments.
DrawingAvailable	Indicates whether the drawing features are supported by the browser.
dRectangle	Draws a rectangle: in an Image control, in an Image variable, in a WDPic variable (on the background layer), in a picLayer variable.
dRectangleGradient	Draws a rectangle: in an Image control, in an Image variable, in a WDPic variable (on the background layer), in a picLayer variable.
dResize	Resizes an image: in an Image control. in an Image variable. in a picLayer variable].
dRotation	Performs a rotation: of an Image control. of an Image variable. of a picLayer variable.
dRoundedRectangle	Draws a rounded rectangle: in an Image control, in an Image variable, in a WDPic variable (on the background layer), in a picLayer variable.
dSaveImage	dSaveImage is kept for backward compatibility.
dSaveImageBMP	Saves an image: in a file in BMP format. in memory.
dSaveImageGIF	Saves an image: in a file in GIF format. in memory.
dSaveImageICO	Saves an image in icon format either in a file, or in memory.
dSaveImageJPEG	Saves an image: in a JPEG file. in memory.
dSaveImagePNG	Saves an image: in a PNG file. in memory.
dSaveImageTIFF	Saves an image in TIFF format into a file or memory.
dShadow	Adds a shadow effect on an image found in an Image variable].
dSlice	Draws a circle section or an ellipse section: in an Image control, in an Image variable, in a WDPic variable (on the background layer), in a picLayer variable.
dStartDrawing	Indicates that the drawing functions that will be used are intended for: the specified Image control, the specified Image variable, the specified Image variable, the specified WDPic variable (on the background layer), the specified picLayer variable.
dStraighten	Transforms an image by applying perspective correction.
dText	Draws a text: in an Image control, in an Image variable, in a WDPic variable (on the background layer), in a picLayer variable.
dTextMarkdown	Draws Markdown text: in an Image control, in an Image variable, in a WDPic variable (on the background layer), in a picLayer variable].
dTextRTF	Draws RTF text: in an Image control, in an Image variable.
dTransferToImage	Creates an image from a buffer of pixels encoded in a specific format. This function is an advanced function. This function is mainly used to handle the images returned by external APIs via Image variables.
dVerticalSymmetry	Flips an image with respect to a vertical axis (symmetry with respect to a vertical axis).
HSL	Creates a color from its hue, saturation and lightness.
HTMLToRGB	Converts the HTML color into RGB color.
RGB	Defines a color from its Red, Green and Blue components.
RGBBlue	Returns the blue component of an RGB color.
RGBGreen	Returns the green component of an RGB color.
RGBRed	Returns the red component of an RGB color.
RGBToHTML	Returns the HTML color corresponding to the RGB color.

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

Unit examples (WINDEV): Modifying the Hue, Saturation and Lightness

[ + ] Process on the images via the WLanguage dModifyHSL function.
This function is used to modify the hue, the saturation and the lightness of an image.

Training (WINDEV): WD Java Chart Designer

[ + ] WINDEV enables you to create some Java applications without even knowing Java.
You program with a 5GL (WLanguage) and WINDEV generates the Java code.
The drawing functions of WINDEV are available in Java generation.
This example explains how to create charts with these drawing functions.
Three types of charts are presented in this example:
- the bar chart,
- the scatter chart,
- and the line chart.

Complete examples (WINDEV): WD Magnifier

[ + ] This example enables you to zoom part of the screen with a magnifier.
The maximum zoom value is set to 8.
Summary of the example supplied with WINDEV:
The WLanguge function named dCopyBlt() and the WLanguage property named ..Opacity allow you to perform a capture of the Windows desktop at the location of a window without this window appearing in the screen shot.
This example uses this tip to zoom the part of the screen found below the magnifier.

Cross-platform examples (WINDEV Mobile): WM Notes

[ + ] This example is using the drawing functions of WLanguage for Android and iOS.
It allows you to draw graphic "notes" and to save them.

Cross-platform examples (WINDEV Mobile): WM System

[ + ] This application is an example of some of the features of WINDEV Mobile available for Android/iOS.
The following system functions are used:
- NFC
- Multimedia control
- Brightness
- Volume
- Wi-Fi
- Bluetooth
- Toast
- Compass
- Accelerometer
- Camera control
- LED
- Vibration
- Notifications
- Drawing functions
- Internet

Training (WEBDEV): WW_Drawing_HTML5

[ + ] WEBDEV includes some drawing functions in browser code, for the browsers that support the HTML5. standard.
This educational example presents:
- an array of drawings,
- and an implementation: the visual choice by the Web user of the categories of seats when making a reservation for a show.

Unit examples (WEBDEV): The drawing functions

[ + ] This example presents the main drawing functions of WEBDEV and it allows you to:
- Initialize an Image control for drawing
- Draw simple shapes
- Write a text in a drawing
- Change the color in a drawing