Draws an arc onto the display from start to stop angle, centered at x and y and inscribed in a rectangle with sides length w(idth) and h(eight).
You can draw many things with the commands in the Drawing drawer of your Game Lab toolbox. For arc(), the x and y coordinates specify the center of the arc, relative to the top-left corner of the display area (x:0 y:0). The width and height of the rectangle that the arc is inscribed in are measured in pixels. The start parameter specifies what angle in degrees to start the arc at, 0 degrees is to the right. The stop parameter specifies what angle in degrees to end the arc in a clockwise direction from start.
Arcs are drawn using the current stroke weight and current stroke color, and then filled with the current fill color (unless noStroke()
or noFill()
commands have been run).
Use a loop to sweep out many sections of a circle in different shades of red.
// Use a loop to sweep out many sections of a circle in different shades of red. var sections=50; for (var i = 0; i < sections; i++) { fill(rgb(255-((255/sections)*i), 0, 0)); arc(200, 200, 200, 200, i*(360/sections), (i+1)*(360/sections)); }
arc(0, 0, 800, 800, 0, 90);
A selection of arcs.
// A selection of arcs. arc(50, 55, 50, 50, 0, 90); noFill(); arc(50, 55, 60, 60, 90, 180); arc(50, 55, 70, 70, 180, 225); arc(50, 55, 80, 80, 225, 360);
arc(x, y, w, h, start, stop)
Name | Type | Required? | Description |
---|---|---|---|
x | Number | The x-location in pixels of the center of the arc, from left to right on the display. Should be a number from 0 to 400, but negative numbers will center the arc to the left of the display and numbers greater than 400 will center the arc to the right of the display (possibly unseen). | |
y | Number | The y-location in pixels of the center of the arc, from top to bottom on the display. Should be a number from 0 to 400, but negative numbers will center the arc above the display and numbers greater than 400 will center the arc below the display (possibly unseen). | |
w | Number | The horizontal width in pixels of the rectangle that the arc is inscribed in. Should be a positive number, but negative numbers will draw the same arc as positive. | |
h | Number | The vertical height in pixels of the rectangle that the arc is inscribed in. Should be a positive number, but negative numbers will draw the same arc as positive. | |
start | Number | The angle in degrees to start the arc, 0 degrees is to the right. | |
stop | Number | The angle in degrees to end the arc in a clockwise direction from start. 0 degrees is to the right. |
No return value. Outputs to the display only.
noFill()
or noStroke()
haven't been called, and where you're trying to draw the ellipse fits within the coordinates of the display (400 x 400).strokeWeight()
, stroke()
, and fill()
.Found a bug in the documentation? Let us know at documentation@code.org