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# Mouse and Scrolling ## Enable smooth scrolling Smooth scrolling allows pixel-precise scrolling of the canvas when your mouse or trackpad supports it. When enabled, NPS Image Editor will try to scroll with the precision it is given. If for some reason this is slow or does not work as expected, you can disable smooth scrolling to instead allow the image to be scrolled in discrete steps. WARNING: Not all systems or mouse/trackpad drivers support smooth scrolling, and even less of them will send the requisite information to NPS Image Editor since they tend to err on the side of caution for other software that does not support smooth scrolling. Make sure smooth scrolling is enabled in the mouse driver's control panel. ## Keyboard modifiers and wheel actions Rolling the mouse wheel or performing the equivalent scrolling gesture on other input devices while holding one of the modifier keys (Ctrl, Alt, Shift) can perform different actions. ### Scroll normally Scrolls horizontally or vertically with the mouse wheel based on the "Scroll horizontally when the size of the image dictates" setting as well as the horizontal or vertical wheel/mode of your input device ### No action (scrolling disabled) Blocks mouse scrolling when the wheel is rotated and the modifier key is held down ### Horizontal scrolling Forces horixontal scrolling. Useful if your mouse does not support native horizontal scrolling (or the mouse driver does not send horizontal scroll events to NPS Image Editor). ### Vertical scrolling Forces vertical scrolling ### Zoom Zooms the image in and out by one predefined step ### Drawing width Adjusts the drawing width by 1 pixel while you are drawing ### Cycle color Cycles the color by one step forward or back when in "Pick" mode, essentially allowing manual color cycling. See Color Cycling for more information on how color cycling modes work. ## Auto scroll while resizing images If enabled, the canvas will automatically scroll to ensure that the resize grip is always visible. This makes it easier to resize images by large amounts. If disabled, the canvas will stay in place, requiring you to manually scroll via the wheel and/or move the cursor outside of the NPS Image Editor window to resize the image. This makes it easier to resize the image by a precise amount. TIP: You can access this option from the main window by double-clicking "SCR" in the status bar ## Scroll horizontally when the size of the image dictates If your image is wider and shorter than the viewport (so only a horizontal scrollbar appears), enabling this option will automatically scroll horizontally even when the vertical mouse wheel is used. If disabled, the vertical mouse wheel will do nothing and you will need to manually scroll horizontally via one of the modifier keys configured above.