How to draw a fan with OpenLayers

ol3:

Create a fan. param [x,y] center sector center point.

Param Number randius Sector radius The coordinate system unit corresponding to the center point.

param number sangle angle between the start edge of the sector and the positive direction of the x-axis

param number angle° (positive counterclockwise).

returns

constructor

function (center, randius, sangle, angle) {

sangle = (360 - sangle + 90) %360;

var lines =

var s = false;

var sp = center;

var ep = null;

for (var i = 0; i <= angle; i += {

var x = center[0] +randius * i));

var y = center[1] +randius * i));

if (s) {

sp = [x, y];

s = !s;

else {

ep = [x, y];

ep]);sp = ep;

return new ;

var degreetoradian = function (degree) {

return * degree / 180;

Landlord, I use C language.

C language drawing mouse like steps.

Register off, mouse position.

2.Change the position of the mouse to draw the mouse.

3.Relay processing.

4.Repeat the polygon step.

Draw mouse pose, 3 kinds of the same (I know).

Draw the line directly (references).

2.Storage and preservation (references).

I used to practice my hands, but I didn't optimize, and I felt the card).

The face draw mouse module specializes in drawing the mouse, which belongs to the storage and preservation) 3.Mask.

Write in graphic mode.

Hope helps.

Hello, glad to answer for you.

The page initiates an asynchronous request; The server-side program processes the request result into a geojson string and sends it back to the request page. The request page uses the parsed geojson string provided by OpenLayers to display the results on the map.

Initial map. function init()

The geojson string is obtained asynchronously through dwr and handed over for processing.

function locorie()

;} Update data every 10 seconds.

function startorie()

Questioner commentsThank you!