### 7.9. Symmetry Painting Dialog

Symmetry Painting is supported by brush-based tools (Pencil, Paintbrush, Eraser, Airbrush, MyPaint brush, Clone, Smudge, Dodge) as well the Ink tool. There are several kinds of symmetry, all configurable.

#### 7.9.1. Accès au dialogue

You can access this dialog from the main menu through: Windows → Dockable Dialogs → Symmetry Painting.

La fenêtre « peinture en symétrie » est une fenêtre ancrable : voyez la section Dialogues, fenêtres et onglets sur l’utilisation des ancrages.

#### 7.9.2. Utilisation de la fenêtre Peinture en symétrie

Figure 15.142. La boîte de dialogue Peinture en symétrie

This dialog is very simple. You only have a Symmetry item with a drop-down list that offers four options. As soon as you check a symmetry type, symmetry axes appear as dotted green lines in the image window and you can start painting with the brush you have chosen.

Options

Symmetry

  This setting determines the type of symmetry painting.

  Aucune

    This is the default. It disables symmetry painting.

  Miroir

    Figure 15.143. The Symmetry Mirror dialog

    This type of symmetry will reflect all strokes like in a mirror. There are several types of mirroring. More than one type can be selected.

    Mirror Options

    Horizontal symmetry

      Brush strokes will be mirrored across a horizontal axis.

    Vertical symmetry

      Brush strokes will be mirrored across a vertical axis.

    Central symmetry

      Brush strokes will be inverted through a central point.

    Disable brush transform

      When you transform the drawing, the brush itself will end up transformed as well. For instance, in a mirror transform, not only will your drawing on the right side of the canvas be mirrored on the left, but the brush itself is also « flipped » on the left.

      If you want the drawn lines to be mirrored (or other transformation), but not the brush outline itself, enable this setting. Obviously, you will only notice the effect of this setting when you use a brush that is not symmetrical.

    Vertical axis position, Horizontal axis position

      The default position for symmetry axes is the center of the image. These sliders allow you to change the position used to mirror your brush strokes.

      By clicking the lock icon next to the sliders, you can choose whether you want to keep both sliders synchronized or not.

  Mosaïque

    « Tiling » is a translational symmetry, which can be finite (with a maximum of strokes) or infinite. In the latter case, it is the perfect tool to create patterns or seamless tiles.

    Figure 15.144. Le dialogue Symétrie en mosaïque

    This mode covers the image with strokes at regular distances on the X and Y axis.

    Tiling Options

    Interval X, Interval Y

      These are the intervals on the X and Y axis, in pixels, between the centers of each stroke.

    Maj

      This determines the amount of shift between lines on the X axis, in pixels.

    Max strokes X, Max strokes Y

      These are the maximum number of brush strokes on the X and Y axis that will be painted on the image. The default is 0, which means there is no limit.

      By clicking the lock icon next to the sliders, you can choose whether you want to keep both sliders synchronized or not.

  Mandala

    Figure 15.145. Le dialogue Symétrie Mandala

    Strokes are drawn around the center determined by the options below.

    Mandala Options

    Center abscissa, Center ordinate

      These coordinates determine the center around which the mandala strokes will be painted.

      By clicking the lock icon next to the sliders, you can choose whether you want to keep both sliders synchronized or not.

    Number of points

      This determines the amount of strokes that will be performed each time you use a brush.

    Disable brush transform

      See the same setting for Mirror symmetry.

    Kaleidoscope

      When enabled, it mirrors consecutive strokes.

#### 7.9.3. Exemples

La brosse Poivron est sélectionnées. Le crayon est utilisé.

Exemple pour Miroir

  Figure 15.146. Symétrie verticale

  Un seul clic

  Un coup de brosse

Exemple pour Mosaïque

  Figure 15.147.

  Un seul clic. Décalage = 20.

  Un coup de brosse

Exemple pour Mandala

  Figure 15.148.

  Un seul clic

  Un coup de brosse

7.8. Pointeur |  | 7.10. Keyboard Shortcuts Dialog

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