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Shade map v2 with a grey color outside a circle


Shade map v2 with a grey color outside a circle

By : Mark Argent
Date : November 17 2020, 11:52 AM
Hope that helps I know how to draw a circle at a certain location on the map and give it a fill color. However, How can I do the opposite? Basically draw a circle but give a color to the area outside the circle. , Did you try to use the stroke color?
code :


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Color function to return a shade lighter and a shade darker

Color function to return a shade lighter and a shade darker


By : s.z
Date : March 29 2020, 07:55 AM
this one helps. A good way is to convert it to HSL color space, adjust the "lightness" component, and convert back to RGB.
I found two pages where are mentioned formulas you might use, or you can just try to google a java solution.
code :
Y =  (0.257 * R) + (0.504 * G) + (0.098 * B) + 16

V =  (0.439 * R) - (0.368 * G) - (0.071 * B) + 128

U = -(0.148 * R) - (0.291 * G) + (0.439 * B) + 128
B = 1.164(Y - 16)                  + 2.018(U - 128)

G = 1.164(Y - 16) - 0.813(V - 128) - 0.391(U - 128)

R = 1.164(Y - 16) + 1.596(V - 128)
How to shade the circle in canvas

How to shade the circle in canvas


By : sab
Date : March 29 2020, 07:55 AM
Hope this helps As @danday74 says, you can use a gradient to add depth to your circle.
You can also use shadowing to add depth to your circle.
code :
var canvas=document.getElementById("canvas");
var ctx=canvas.getContext("2d");

var PI=Math.PI;

drawShadow(150,150,120,50);


function drawShadow(cx,cy,r,strokewidth){
  ctx.save();
  ctx.strokeStyle='white';
  ctx.lineWidth=5;
  ctx.shadowColor='black';
  ctx.shadowBlur=15;
  //
  ctx.beginPath();
  ctx.arc(cx,cy,r-5,0,PI*2);
  ctx.clip();
  //
  ctx.beginPath();
  ctx.arc(cx,cy,r,0,PI*2);
  ctx.stroke();
  //
  ctx.beginPath();
  ctx.arc(cx,cy,r-strokewidth,0,PI*2);
  ctx.stroke();
  ctx.shadowColor='rgba(0,0,0,0)';
  //
  ctx.beginPath();
  ctx.arc(cx,cy,r-strokewidth,0,PI*2);
  ctx.fillStyle='white'
  ctx.fill();
  //
  ctx.restore();
}
body{ background-color: white; }
canvas{border:1px solid red; margin:0 auto; }
<canvas id="canvas" width=300 height=300></canvas>
IOS figure out shade of in grey keyboard buttons

IOS figure out shade of in grey keyboard buttons


By : M H R V K REDDY
Date : March 29 2020, 07:55 AM
wish of those help You can use a color picker to figure it out.
It's (173, 180, 190).
how to change the color of circle to back with original color on clicking of another circle in D3 Js chart

how to change the color of circle to back with original color on clicking of another circle in D3 Js chart


By : ankit
Date : March 29 2020, 07:55 AM
help you fix your problem I have a D3 JS chart which draws Circle for each Class and radius for each circle is NoOfStudents in that particular class. , Give the circles a class to select them later :
code :
.attr("class", "bar allCircles") //i didnt use 'bar' on purpose as you may have used it elsewhere
circles.on("click", function (d) {
        d3.selectAll('.allCircles').style('fill','black'); //fill all circles black
        d3.select(this).style("fill", "lightcoral"); //then fill this circle lightcoral
    });
Need to get different Grey color shade randomly using jquery

Need to get different Grey color shade randomly using jquery


By : Zmaj
Date : March 29 2020, 07:55 AM
Any of those help rgb(x,x,x) is gray. Replace x with a random number and you will get different gray colors. Range is rgb(0, 0, 0)(black) - rgb(255,255,255)(white). Examples could be: rgb(5,5,5) or rgb(111,111,111) or rgb(99,99,99).
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