Animation and Games CodeHS- Test Questions & Answers

Animation and Games CodeHS- Test
Questions & Answers
In the following code:

var ball;

function start(){

ball = new Circle(20);

add(ball);

setTimer(draw, 20);

}

function draw(){

ball.move(2, 2);

}

When will the function draw be called? ✔️Correct Ans-Every 20 milliseconds




Which statement will call a function animate every 50 milliseconds? ✔️Correct Ans-
setTimer(animate, 50);



9.1.5 Crazy Ball ✔️Correct Ans-var RADIUS = 100;

var circle;

function start(){

circle = new Circle(RADIUS);

circle.setPosition(getWidth()/2, getHeight()/2);

,add(circle);

setTimer(crazyBall, 100);

}

function crazyBall(){

var x = Randomizer.nextInt(RADIUS, getWidth()-RADIUS);

var y = Randomizer.nextInt(RADIUS, getHeight()- RADIUS);

circle.setPosition(x,y);

circle.setColor(Randomizer.nextColor());

}



What does this program do?

function drawCircle(x, y, radius, color){

var circle = new Circle(radius);

circle.setPosition(x, y);

circle.setColor(color);

add(circle);

}

function start(){

setTimer(draw, 50);

}

function draw(){

var color = Randomizer.nextColor();

var centerX = getWidth()/2;

,var centerY = getHeight()/2;

var radius = 100;

drawCircle(centerX, centerY, radius, color);

} ✔️Correct Ans-Draws several randomly colored circles at the center of the canvas by drawing 1
every 50 milliseconds.



Which statement would stop the timer in the following program?

function drawCircle(x, y, radius, color){

var circle = new Circle(radius);

circle.setPosition(x, y);

circle.setColor(color);

add(circle);

}

function start(){

setTimer(draw, 50);

}

function draw(){

var color = Randomizer.nextColor();

var centerX = getWidth()/2;

var centerY = getHeight()/2;

var radius = 100;

drawCircle(centerX, centerY, radius, color);

} ✔️Correct Ans-stopTimer(draw);

, 9.2.5: Growing Circle ✔️Correct Ans-var START_RADIUS = 1;

var INCREMENT = 1;

var CHANGE_COLORS_AT = 10;

var circle;

var MAX_RADIUS = 240;

var counter = 0;

function start(){

circle = new Circle(START_RADIUS);

circle.setPosition(getWidth()/2, getHeight()/2);

add(circle);

setTimer(draw, 50);

}

function draw(){

START_RADIUS = START_RADIUS + INCREMENT;

circle.setRadius(START_RADIUS);

counter++;

if(START_RADIUS % 10 == 0){

circle.setColor(Randomizer.nextColor());

}

if(counter == MAX_RADIUS){

stopTimer(draw);