Question

In: Computer Science

The x slider will control the circles with id xl and xr.    As the sliders move...

The x slider will control the circles with id xl and xr.    As the sliders move too the right the two circles get closer together until they meet in the middle. The y slider will control the circles with id yt and yb.    As the sliders move too the right the two circles get closer together until they meet in the middle. When all four circles are in the green square the circle should be red and black otherwise. The position and size of the square is random, and changes position and size when you load the page.

Instructions:

  • Start with the files in midW05.zip.
  • When all the circles are in the square all the circles should be red.
  • Write a helper function call isCircleInRect that accepts an id of a circle and an id of a red box returns true if the center of the circle is in the box and false otherwise.
  • Implement the sliderXListener such that the two circles with id's xl and xr move closers together as the slider value increases and meet at the middle, changes the color of the circle if necessary.
  • Implement the sliderYListener such that the two circles with id's yt and yb move closers together as the slider value increases and meet at the middle, changes the color of the circle if necessary.
  • Uses the helper functions isCircleInRect to help implement the event listeners.

.html file:

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <script src="questionW05.js" defer></script>

    <title>Midterm Question</title>

    <script>

        function setup(){

            let box = document.querySelector("#box");

            let size = Math.random()*20 + 90;

            let x = Math.random()*10 + 45;

            let y = Math.random()*10 + 45;

            box.setAttribute("x",x);

            box.setAttribute("y",y);

            box.setAttribute("width",size);

            box.setAttribute("height", size);

        }

    </script>

</head>

<body onload="setup()">

    <svg width="200px" height="200px">

        <!-- the size and position of the rectangle changes randomly

            when the page is reloaded -->

        <rect id="box" x="50" y="50" width = "100" height="100" fill="green"/>

        <g id="circles">

            <circle id="xl" cx="0" r="10" cy="100" fill="black" />

            <circle id="xr" cx="200" r="10" cy="100" fill="black" />

            <circle id="yt" cx="100" r="10" cy="0" fill="black" />

            <circle id="yb" cx="100" r="10" cy="200" fill="black" />

        </g>

        

    </svg><br>

    <label>X Slider</label><input id="xSlider" type="range" min="0" max="100" value="0" oninput="sliderXListener(event)"><br>

    <label>Y Slider</label><input id="ySlider" type="range" min="0" max="100" value="0" oninput="sliderYListener(event)"><br>

</body>

</html>

.js file:

function isCircleInRect(circ, rect){

}

function sliderXListener(event){

  

}

function sliderYListener(event){

}

Solutions

Expert Solution

function isCircleInRect(circ, rect){
    let circle = document.getElementById(circ);
    let rectangle = document.getElementById(rec);
    let coordX = circle.getAttribute("cx");
    let coordY = circle.getAttribute("cy");
    let rectX = rectangle.getAttribute("x");
    let rectY = rectangle.getAttribute("y");
    if (coordX   ) {

    }
}

function sliderXListener(event){
  let circleA = document.querySelector("#xl");
  let circleB = document.querySelector("#xr");

  let sliderX = document.querySelector("#xSlider");

  let xln = circleA.getAttribute("cx");
  let xrn = circleB.getAttribute("cx");

  circleA.setAttribute("cx", sliderX.value);
  circleB.setAttribute("cx", 200 - sliderX.value);
}

function sliderYListener(event){
  let circleC = document.querySelector("#yt");
  let circleD = document.querySelector("#yb");

  let sliderY = document.querySelector("#ySlider");

  let ytn = circleC.getAttribute("cy");
  let ybn = circleD.getAttribute("cy");

  circleC.setAttribute("cy", sliderY.value);
  circleD.setAttribute("cy", 200 - sliderY.value);

}

venereology answered 2 months ago
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