The guest will then be added to the site with Pending status. The guest will also receive an email from Instructure Canvas with steps to create their account. Important: The guest should respond that they Do Not have a Canvas account (in our UNC-CH instance) if prompted during setup, even if they have one at another institution. After creating their account, the guest will be able to log into Canvas at canvas.unc.edu using the Non-Onyen Login button. Note: Users may be added to sites during the current term but not after courses have concluded.


Welcome to the Canvas Learning Management System (LMS). Please use the resources provided below to become familiar with Canvas technical requirements, common terms, features, and other information you may need to have a successful online learning/teaching experience. If you experience any issues or have any requests regarding Canvas, Respondus LockDown Browser, PeerWise, or Mediasite, email canvas@unthsc.edu. Faculty and staff needing multimedia, video, or course design and development assistance may also contact canvas@unthsc.edu. All other technology support needs should be sent to HSC Helpdesk.


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Throughout the semester you may see users added to your course in the Tutor role. These requests come from the Center for Academic Performance and are sent to the Division of Academic Innovation at the canvas@unthsc.edu email address.

"ACD is planning to release Canvas Mac in the middle of 2015. The Canvas Mac Beta release date is to be determined". Source from the official Canvas web forum: mcosgrove (Administrator) -canvas-for-mac/page7

It can be used both for regular meetings, for interactive group VR sessions using regular see-through 3D glasses, or a mixed mode that feature both 2D and 3D imagery. In this way, the canvas is one investment that suits 3 purposes!

From Friday movie nights to Blacklight Bowling; from live concerts to "coffee and canvas" events, Sundown Sessions at the SUB are university-sponsored events tailored to give BU students fun activities to participate in on campus every Friday and Saturday night during the school year. Sundown Sessions are free to all students.

When in doubt, ask for help! You can get assistance in Canvas using the "Help" button, by sending us an email at canvashelp@case.edu, or by contacting the [U]Tech Service Desk at help.case.edu or help@case.edu.

Now when I want to draw a crisp line, I found that there are two things to fight with. The first one is that canvas uses antialiasing. So when I draw a line of thikness 1 at integer coordinates, it will be blurred.

Let's say my display is hi-res and window.devicePixelRatio is 2.0. When I apply context scaling to adapt canvas to the hi-res display and want to draw the line with thickness of 1, can I just ignore the context scale and draw

Scaling the canvas buffer to the monitor's pixel ratio works because on high-res devices, multiple physical dots will be used to cover a single px area. This allows to have more details e.g in texts, or other vector graphics. However, for bitmaps this means the browser has to "pretend" it was bigger in the first place. For instance a 100x100 image, rendered on a 2x monitor will have to be rendered as if it was a 200x200 image to have the same size as on a 1x monitor. During that scaling, the browser may yet again use antialiasing, or another scaling algorithm to "create" the missing pixels.

By directly scaling up the canvas by the pixel ratio, and scaling it down through CSS, we end up with an original bitmap that's the size it will be rendered, and there is no need for CSS to scale anything anymore.

But now, your canvas context is scaled by this pixel ratio too, and if we go back to our straight lines, still assuming a 2x monitor, the 0.5px offset now actually becomes a 1px offset, which is useless. A lineWidth of 1 will actually generate a 2px stroke, which doesn't need any offset.

Preventing anti-aliasing requires that the pixels of the canvas, which is a raster image, are aligned with the pixels of the screen, which can be done by multiplying the canvas size by the devicePixelRatio, while using the CSS size to hold the canvas to its original size: ff782bc1db

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