on January 21, 2023

OpenLayers: draw a shape (square or circle) where the user clicks on map

Geographic Information Systems

How do I draw a circle in OpenLayers?

To activate freehand drawing, hold the Shift key. Square drawing is achieved by using type: ‘Circle’ type with a geometryFunction that creates a 4-sided regular polygon instead of a circle. Box drawing uses type: ‘Circle’ with a geometryFunction that creates a box-shaped polygon instead of a circle.

How do you draw a polygon in OpenLayers?

Select a geometry type from the dropdown above to start drawing. To finish drawing, click the last point. To activate freehand drawing for lines, polygons, and circles, hold the Shift key. To remove the last point of a line or polygon, press “Undo”.

How do I create a map with OpenLayers?

How to create a simple map (with a marker) using OpenLayers ?

  1. Put a element where you want your map to be.
  2. Now you can add a

Quote from video: First. Way is if I click and drag to start making this with my other hand if I use my up and down arrow keys. It actually increases or decreases the number of sides of the shape that I'm making.

How do you draw a polygon in a circle?

Procedure: Set the compass to the radius of the circle and strike six equidistant arcs about its perimeter. Connect two neighboring intersections to the center of the circle. Bisect the resulting angle. Beginning at the intersection of the bisector and the circle strike six more arcs around the circle.

How do I draw a circle in OpenGL?

Drawing a Circle using OpenGL - glfw/glew c++



The function above can then be called in the main() function as such: drawCircle(250, 250, 100, 360); To change the circle color, you can use the glColor3f() method which takes in 3 parameters, for the RGB values.
 

How do you draw a circle on an oscilloscope?



Quote from video: Sign on a cosine of 90 degrees out of phase. You attach a sine wave to the X input of the oscilloscope. And the cosine of the Y the oscilloscope will trace a circle on the screen.

How do you make a circle in GUI?

Circle is just suppose to draw a circle in the frame created by Frame with random starting position (and defind the radius). Frame is the mainclass with methods such as addCircle(), bounce(), start(), stop(), run() (moves the circles) and quit(). This class also creates the frame in which the circles are added to.