Declaration
property Rotate: Double;
Description
Specifies the layer rotation angle in degrees counter-clockwise.
Rotation and Resize cannot be used at the same time.
To allow resize after a layer rotation, it must be enacted, i.e. actually rotate the bitmap.
Conversely to allow rotation after a resize, the resizing must be enacted, actually resizing the bitmap.
To enact layer rotation, call
LayersFixRotations.
To enact layer resizing, call
LayersFixSizes.
Finally, multiple rotations can cause the bitmap to add an external, transparent border. To remove this border call
LayersFixBorders.
Note:
◼When rotation is handled by
MouseInteractLayers (setting mlRotateLayers), you don't need to call LayersFixRotations, LayersFixSizes and LayersFixBorders.
◼For Text layers,
Rotate specifies the rotation of the text only. To rotate the border shape, set
BorderRotate◼For angle layers,
Rotate updates the start and end angles, which can lead to inaccuracy if frequently set, so you are better to directly use
StartAngle,
EndAngle or
SweepAngle Demo | Description | Demo Project Folder | Compiled Demo |
Layer Rotation | Free rotation and resizing of layers using mouse interactions | LayerEditing\RotateLayers\RotateLayers.dpr | |
All Layer Editing | Usage of image, shape, text, polygon and line layers | LayerEditing\Layers_AllTypes\Layers.dpr | |
Image Layer Editing | Usage of image layers | LayerEditing\Layers_Images\Layers.dpr | |
Adding Text to Images | Draw text onto images using text layers | LayerEditing\Layers_TextOut\TextLayers.dpr | |
// Rotate a line
ImageEnView1.CurrentLayer.Rotate := 235;
ImageEnView1.Update();
// Set rotation of all selected layers
ImageEnView1.LockUpdate;
for i := 0 to ImageEnView1.LayersCount - 1 do
if ImageEnView1.Layers[i].Selected then
ImageEnView1.Layers[i].Rotate := 90;
ImageEnView1.LayersFixRotations( LYR_SELECTED_LAYERS );
ImageEnView1.UnlockUpdate;
// Apply a "Paid" stamp to image
with ImageEnView1 do
begin
LayersAdd( 'PAID', 42, clRed, 'Arial Black', [fsBold] );
CurrentLayer.Rotate := 30;
TIETextLayer( CurrentLayer ).SizeToText();
CurrentLayer.PosX := IELayer_Pos_HCenter;
CurrentLayer.PosY := IELayer_Pos_VCenter;
LayersMergeAll();
end;
See Also
◼LayersRotateAll◼LayersTextRotateMode◼SupportsFeature◼RotateCenterX◼RotateCenterY◼Flip