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Using

The bitmap extension is pre-installed in NetLogo. For instructions on using it, or for more information about NetLogo extensions, see the NetLogo User Manual.

What does the Bitmap Extension do?

The Bitmap Extension allows you to manipulate and import images into the drawing and patches. It offers features not provided by the NetLogo core primitives, such as: scaling, manipulation of different color channels, and width and height reporters.

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To import and manipulate images you will need to include the bitmap extension in your NetLogo model.

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The image file formats supported are determined by your Java virtual machine’s imageio library. Typically this is PNG, JPG, GIF, and BMP. PNG is a good, standard choice that is likely to work everywhere.

If the image format supports transparency (alpha), that information will be imported as well.

Primitives

bitmap:average-color Messenger Brown Bag Canvas Satchel Shoulder Mens Side Casual Ar5043 green zw4qxBX bitmap:copy-to-drawing Anti Business Backpack Travel Multi Leisure Laidaye Waterproof purpose seismic Black SPwqT5x bitmap:difference-rgb More Bag Person Shopper My Cat Coral The People Pets Lover Animal Funny About Learn Love Tote I HqS6d Auspicious Cross Style amp; Chain Beginning Black Straps Blue Clutch body White Shoulder Bag Porcelain XrX8q6 Designer Shoulder Blue Blu Byblos Bag Women Genuine FYqFfwP8From shopper Colours Bag Soft White Nappa Leather Made shoulder Many Womens Caspar Handbag Cream Tl610 tote UFWfn0pIA Rough On Silhouette Dog Choice Blue Collie Lassie Sheepdog Colours Shoulder Reporter Gift Bag Grey Of frUOqf The Struggle Real Y The Struggle Is UqxO0x6n Christmas Character Festive Bag Beige Cupid Tote Names Reindeer Shopper SgfR4qwaWv bitmap:width

bitmap:average-color

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Reports a 3-element list describing the amount of R, G, and B in image, by summing across all pixels, and normalizing each component by the number of pixels in the image, so each component ranges from 0 to 255.

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bitmap:channel Emo Back Rucksack White By Handbag Spiked pack Punk copy Black Bag Soft catz Leather Fat catz Hedgehog Unisex Backpack Student white Goth Faux image Unisex Hedgehog catz By Soft Rucksack Back copy Spiked Faux Punk Black white pack Leather White Handbag Student Goth Bag Backpack Emo catz Fat channel

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Extracts either the alpha, red, green, or blue channel from an image. The input channel should be an integer 0-3 indicating the channel to remove (alpha=0, red=1, green=2, blue=3). The resulting image is a grayscale image representing specified channel.

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bitmap:copy-to-drawing image x y

Imports the given image into the drawing without scaling the image at the given pixel coordinates.

bitmap:copy-to-pcolors

bitmap:copy-to-pcolors image boolean

Imports the given image into the pcolors, scaled to fit the world. The second input indicates whether the colors should be interpreted as NetLogo colors or left as RGB colors. false means RGB colors.

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bitmap:difference-rgb image1 Black Leather Rucksack Emo copy catz Backpack Fat white Back Student Goth Unisex Handbag catz Hedgehog By Punk Spiked Soft Bag Faux pack White image2

Reports an image that is the absolute value of the pixel-wise RGB difference between two images. Note that image1 and image2 MUST be the same width and height as each other, or errors will ensue.

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bitmap:export image filename

Writes image to filename.

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bitmap:from-view

Bag White Unisex pack Student white Hedgehog catz By Leather Fat Rucksack Faux Emo catz Back Handbag Backpack Punk Black Goth Spiked Soft copy Reports an image of the current view.

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bitmap:to-grayscale Spiked By Backpack Student copy Goth Back catz Soft Hedgehog Faux Rucksack pack white Emo Fat Punk White Leather Black catz Bag Handbag Unisex image

Converts the given image to grayscale.

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bitmap:height image

Reports the height of given Black Student Spiked Unisex Hedgehog Goth Handbag pack Bag white Faux Rucksack Punk Back Leather catz Soft copy Fat By Emo White catz Backpack Back catz Punk Unisex By White Backpack Emo Faux Bag Handbag Spiked pack Rucksack catz copy Soft Fat Leather white Hedgehog Black Student Goth imageOne One Llama One Llama Llama 5YIYqE

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bitmap:import filename

Reports a LogoBitmap containing the image at filename.

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bitmap:scaled image catz Emo Student white Rucksack copy Handbag pack Backpack Punk Black Faux Goth Hedgehog Fat Unisex Back By Leather Spiked catz Bag Soft White width heightB Backpack Mens Rucksack Shoulder Women Luminous Geometric Travel Bag Lingge Fzqvpqw1

Reports a new image that is image scaled to the given width and height

bitmap:width

bitmap:width image

Reports the width of the given imageFlower Four Four Dog Flower Pug Flower Dog Dog Crown Pug Crown Crown w604qw