If this is checked, when you drag your layer, selection, or shape around in the canvas the edges will "snap" to the boundaries of the canvas. Under the View ▸ Guides and Grids menu item, there is an option to "Snap to Canvas”. To hear a “tick” when aligning and snapping guides go to Acorn ▸ Preferences ▸ Guides. Taptic feedback for snapping guides is available on OS 10.11+. To place a vertical guide at the center of your image, select the 'Vertical' option and in the 'Location' field enter the width of your image multiplied by 0.5 (or divided by 2). Pro-Tip: Did you know you can use basic math equations in Acorn's numerical fields? This can be super helpful when placing guides. To temporarily disable document bounds and guide snapping, you can hold down the control key while moving your layer or shape. In the image below, a rectangle shape is aligned at its upper left hand corner with 2 guides. You can align your layer by its outer boundaries, by its horizontal or vertical center, or by a combination of those options. The guides that can be "snapped to" will turn yellow to let you know which guides are being used. This will take the guess work out of getting your layers to align perfectly on the guides. Make sure "Snap to Guides” is checked under the View ▸ Guides and Grids menu item. If you have created guides and want to align layers perfectly to them, click on the move tool. If you have guides present and you want to resize your canvas, there is a check-box option in the resize canvas window to have the guides move to stay in position relative to the resizing, or to remain at their current location. Guides will not print on your image and are not visibly present when you "print preview". Guides can additionally be created under the canvas contextual menu (right click on the image to bring this menu up). They can also be deleted by dragging them off the canvas. Guides can be hidden, cleared, locked, and created under View ▸ Guides and Grids. You can duplicate guides without going all the way back to the ruler by hovering over a guide you want to duplicate, then holding down the option key while clicking and dragging. If you are placing a horizontal guide then the number reflects where you are on the vertical or "y" axis and if you are placing a vertical guide it is where you are on the horizontal or "x" axis. Notice that as the guide is moved around on the canvas, the measurement number changes based on where the guide is located. To move a guide, click and drag on the guide with the move tool. Guides can be created by clicking on either the horizontal or vertical ruler and dragging it out onto the canvas. To have a layer, selection, or shape snap to the grid, make sure ‘Snap to Grid’ is checked under View ▸ Guides and Grids. Grids can be great for lining things up in your image. You can then modify the spacing, color, and appearance of the grid. To modify the grid spacing, choose View ▸ Guides and Grids ▸ Grid Settings. To place a grid on your image, choose View ▸ Guides and Grids ▸ Show Grid. If you want to change the (0,0) point to the top left of the canvas, go to Acorn ▸ Preferences ▸ General. The bottom left hand corner of the canvas is the (0,0) point on the x,y axis. To change the measurement unit, right click on one of the rulers. The measurements the rulers can display are pixels, inches, and centimeters. Rulers will be displayed around the canvas on the top and left hand sides. Rulers can be found under View ▸ Show Rulers (⌘ R). Sometimes things need to be lined up perfectly and relying on human eyes isn't necessary with Acorn. Example AppleScript and JavaScript Scripts. Opening an Image, Creating a New Image, & Acorn's Canvas.Generators, Gradients, & Halftone Effect Filters.Resizing, Rotating, Transforming, & Aligning Layers.Resizing and Rotating Your Image and Canvas.
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