<Image>.ChangeMode (Function)

WINDEV, WEBDEV AND WINDEV MOBILE
ONLINE HELP

Version:

Home | Sign in | English

New WINDEV, WEBDEV, WINDEV Mobile 24 feature!

Anti-aliasing

WINDEV

WEBDEV

WINDEV Mobile

Others

See also

<Image>.ChangeMode (Function)

In french: <Image>.ChangeMode

Changes the drawing mode used by the drawing functions (<Image>.DrawLine, <Image>.DrawRectangle, etc.) in an Image control.

Example

// Draws a rectangle and erases it
IMG_Drawing.ChangeMode(drawXOR)
// Displays the rectangle (in XOR mode)
IMG_Drawing.DrawRectangle(0, 0, 100, 100)
Multitask(10)
// Erases the rectangle
IMG_Drawing.DrawRectangle(0, 0, 100, 100)

Syntax

<Image control>.ChangeMode(<New mode>)

<Image control>: Control name

Name of Image control to use.

<New mode>: Integer constant

Mode for drawing in the image:
drawAntiAliasing Uses the GDI+ and/or the features of the video card to draw the lines and the circles without jagged effects. This drawing mode is slower but the results are better than with the standard mode.
Constant not available.
drawDefault Standard colors.
drawXOR Colors applied via an "exclusive or" operation with the background. Erases a drawing if this option is used twice.
CAUTION: This drawing mode is not compatible with the management of opacity (the drawing is not erased anymore).
Caution:
The drawing in XOR mode is available for the Image controls only. The drawing in XOR mode is not available for the Image variables.
The drawXOR constant cannot be combined with the drawAntiAliasing constant.

Remarks

Anti-aliasing

The anti-aliasing consists in drawing the lines and the circles without jagged effects. This feature requires the GDI+ framework (which means the WINDEV framework).

Example:

Limits:

<Image>.DrawChord is not supported in this mode.
To avoid the jagged edges, the colors and the lines of elements are smoothed out. Some drawing functions can have an unexpected behavior because the specified colors are no longer found. For example, if a borderline color is specified for <Image>.Fill, this color is not found: the entire area is filled up.
For a drawing with anti-aliasing, <Image>.DrawPolygon and <Image>.DrawSlice will have the following behavior. The outline is drawn above the inside of polygon: therefore, the line is partly combined with the inside of polygon. If the line is very thick, it will be displayed in two colors.
See GDI+ framework for more details.

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

Component : wd240pnt.dll