JavaScript 将对象从起始位置移动到结束位置 [英] JavaScript moving an object from starting location to ending location
问题描述
我目前正在学习计算机编程入门课程.这是一门在线课程,当您遇到困难时没有太多帮助.
I'm currently taking a course on intro to computer programming. It's an online course and doesn't have much help when you're stuck.
我正在使用 Brackets 和 p5.js,我得到了一个模板来开始.到目前为止,我似乎已经完成了所需的一切,但我无法为聚光灯设置动画以使其移动.
I'm using Brackets and p5.js and I'm given a template to start off with. I seem to have done everything needed so far, but I'm not able to animate the spotlight to move.
我相信我没有正确初始化聚光灯,但我尝试了多种不同的方法.如果有人能指出我正确的方向,我将不胜感激.代码如下.
I believe I haven't initialized the spotlight properly but I've tried multiple different ways. If someone could point me in the right direction, I would appreciate it. Code below.
通过创建初始化为您所在位置的 x 和 y 属性来编辑聚光灯对象.还将 endX 和 endY 属性初始化为 Marvin 的位置
Edit the spotlight object by creating x and y properties initialised to your location. Also endX and endY properties initialised to Marvin's location
通过调整 x 和 y 属性的增量,使聚光灯完美地从您移向 Marvin.如果一切正确,它就会停在目标上方.
Make the spotlight move perfectly from you towards Marvin by adjusting the increments of the x and y properties. If you get everything correct then it will stop over the target.
使用
"+="或"+"
*/
var x;
var y;
var startX = 360;
var endX = 575;
var startY = 760;
var endY = 570;
// other variables, you don't need to change these
var img, spotlight_image;
var spotlight;
function preload()
{
img = loadImage('scene.png');
spotlight_image = loadImage('spotlight.png')
}
function setup()
{
createCanvas(img.width, img.height);
//Initialise the spotlight object
//with properties x, y, endX and endY
x = 360;
y = 760;
endX =575;
endY = 570;
spotlight = {
image: spotlight_image
}
}
function draw()
{
image(img, 0, 0);
// alter the object properties x and y below to animate the spotlight
x += 1;
y +=1;
////////// DO NOT CHANGE ANYTHING BELOW /////////////
//stop the spotlight if it goes off of the screen
spotlight.x = min(spotlight.x, 960);
spotlight.y = min(spotlight.y, 945);
spotlight.x = max(spotlight.x, 0);
spotlight.y = max(spotlight.y, 0);
if (abs(spotlight.endX - spotlight.x) < 50
&& abs(spotlight.endY - spotlight.y) < 50)
{
spotlight.x = spotlight.endX;
spotlight.y = spotlight.endY;
}
var spotlightSize = 180;
blendMode(BLEND);
background(10);
image(spotlight.image, spotlight.x-spotlightSize/2,
spotlight.y-spotlightSize/2, spotlightSize, spotlightSize);
blendMode(DARKEST);
image(img, 0, 0);
////////// DO NOT CHANGE ANYTHING ABOVE /////////////
}
推荐答案
x
, y
, endX
, endY
必须是 spotlight
的属性:
x
, y
, endX
, endY
have to be properties of spotlight
:
function setup()
{
createCanvas(1000, 1000);
spotlight = {
image: spotlight_image,
x: 360,
y: 760,
endX: 575,
endY: 570,
}
}
增加 spotlight.x
和 spotlight.y
,而不是 x
和 y
:
Increment spotlight.x
and spotlight.y
, rather than x
and y
:
function draw()
{
image(img, 0, 0);
// alter the object properties x and y below to animate the spotlight
spotlight.x += 1; // <-----
spotlight.y += 1; // <-----
////////// DO NOT CHANGE ANYTHING BELOW /////////////
//stop the spotlight if it goes off of the screen
spotlight.x = min(spotlight.x, 960);
spotlight.y = min(spotlight.y, 945);
spotlight.x = max(spotlight.x, 0);
spotlight.y = max(spotlight.y, 0);
if (abs(spotlight.endX - spotlight.x) < 50
&& abs(spotlight.endY - spotlight.y) < 50)
{
spotlight.x = spotlight.endX;
spotlight.y = spotlight.endY;
}
var spotlightSize = 180;
blendMode(BLEND);
background(10);
image(spotlight.image, spotlight.x-spotlightSize/2,
spotlight.y-spotlightSize/2, spotlightSize, spotlightSize);
blendMode(DARKEST);
image(img, 0, 0);
////////// DO NOT CHANGE ANYTHING ABOVE /////////////
}
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