Sage-Tips

Why are the pixel locations on the vertical axis of a display window flipped?

This is a great question that I’ve thought of many times. The simple answer to “why” is because TV formats also drew their lines from left-to-right then top-to-bottom. Original computer monitors were CRT screens (small TVs), so the format naturally stayed the same.

Why do you think the coordinate system starts in the upper left corner instead of the center of the window?

This is because by java AWT convention the x and y axes are defined differently than in regular algebra. The Y axis goes from the top left, with increasing numbers heading DOWN, unlike the regular co-ordinate plane where increasing y values would be heading UP.

Where is the origin of the coordinate axes located on the screen?

Drawing a Coordinate Graph The origin is located at (0,0). Note that coordinates are often written with no space after the comma.

Where is the origin of the screen?

1 Answer. Yes, the origin is always in the top left corner in screen space. This has historical reasons, as screen space calculations started when television sets were used as screens. The raster gun of a TV starts at the top left corner, so this was accepted as the origin.

What do screen space coordinates represent?

Screen Coordinate System – This 2D coordinate system refers to the physical coordinates of the pixels on the computer screen, based on current screen resolution. ( E.g. 1024×768 ) Viewport Coordinate System – This coordinate system refers to a subset of the screen space where the model window is to be displayed.

Where do pixel coordinates start?

In terms of coordinates, a pixel can be identified by a pair of integers giving the column number and the row number. For example, the pixel with coordinates (3,5) would lie in column number 3 and row number 5. Conventionally, columns are numbered from left to right, starting with zero.

Which coordinate system treats the position 0 0 as being in the middle of the screen?

Absolute coordinates are based on the UCS origin (0,0), which is the intersection of the X and Y axes. Use absolute coordinates when you know the precise X and Y values of the point.

Which coordinate system treats the position 0 0 as being at the top left corner of the screen?

The origin
x = 17; myShape. y = 212; The display object positioning system treats the Stage as a Cartesian coordinate system (the common grid system with a horizontal x axis and vertical y axis). The origin of the coordinate system (the 0,0 coordinate where the x and y axes meet) is at the top-left corner of the Stage.

How world coordinate system is converted to screen coordinate system?

World coordinate system (WCS) is the right handed cartesian co-ordinate system where we define the picture to be displayed. The lower left handed corner is the origin of the coordinate system. Mapping the window in the world coordinate space to viewport in NDC space is called the Normalization Transformation, N.

When was the Word screen invented?

1810
Meaning “flat vertical surface for reception of projected images” is from 1810, originally in reference to magic lantern shows; later of movies.

Is Vulkan right handed?

One of the key differences between OpenGL and Vulkan -and something that needs careful consideration when porting to Vulkan, is the coordinate system. Vulkan requires the right hand NDC space compared to GL that requires the left hand.

Do pixels start at 0 or 1?

It depends, but usually no. pixel is (often) a picture element, which includes R, G, B values, and now often such values go from 0 to 255 (so 8 bits). But black and white (really black and white, not the gray scale) have just 0 for black and 1 for white.