我制作了一个平台游戏并尝试添加碰撞，但我的代码由于某种原因无法工作，我无法再跳跃我尝试重做代码：这里是 PS我是P5新手
//game control ***(not used rn)***
let level = 0;
//gravity
let minHeight = 375
let direction = 1;
let vel = 2;
let jumpPower = 10;
let fallingSpeed = 1;
//player setup and whatnot
let playerX = 400;
let playerY = 370
let playerWidth = 30;
let playerHeight = 70;
//platform
let platX = 200;
let platY = 300;
let platWidth = 200;
let platHeight = 40;
function setup() {
createCanvas(800, 500);
rectMode(CENTER);
textAlign(CENTER);
}
function gravityControl(){
if (keyIsDown(32)){
jump = true
}else{
jump = false
}
}
function draw() {
background(220);
movement();
gravityControl()
gravity()
if (level == 0) {
game();
}
}
function game() {
background(150, 230, 240);
//floor
noStroke();
fill("green");
rect(width / 2, 450, width, 100);
//platform
stroke(0);
strokeWeight(4);
fill("rgb(218,218,138)");
rect(platX, platY, platWidth, platHeight);
//player
noStroke();
fill("red");
rect(playerX, playerY, playerWidth, playerHeight);
//collisions
if (playerX >= platX -platWidth/2 && playerX <= playerX+platWidth/2 && playerY >= platY-platHeight/2 &&playerY<=platY+platHeight/2)
playerY = playerY
vel = 0
}
function movement() {
if (keyIsDown(LEFT_ARROW)) {
playerX -= 3;
}
if(keyIsDown(RIGHT_ARROW) )
playerX += 3
}
function mousePressed() {
fullscreen(true);
}
function gravity(){
if (playerY >= minHeight && jump == false){
if(playerY >= minHeight){
playerY = minHeight
}else{
vel = fallingSpeed
}
playerY = playerY +0
}
else{
playerY = playerY + (direction * vel)
}
if (jump == true){
vel = -jumpPower
}else{
vel = fallingSpeed
}
}
function gravityControl(){
if (keyIsDown(32)){
jump = true
}
else{
jump = false
}
}
我尝试删除导致冲突发生的代码，并且成功了。我将不胜感激任何帮助。我正在关注 Youtube 上的教程，我们有相同的代码。我预计它会在实现碰撞后跳跃，但事实并非如此 YT链接：https://www.youtube.com/watch?v=StoBCNiQakM&list=PLBDInqUM5B26FjwMMZqGDxqQr1kX5V9Ul&index=3
这是代码的一个版本，经过一些细微的更改，修复了跳转功能。我假设您希望能够在平台顶部着陆/行走，所以我的版本允许您这样做。有关具体更改的详细信息，请参阅代码中的注释。
特别注意，在你的碰撞情况下，有必要分别测试两种可能性（从上面和从下面与平台碰撞）。
同样相关：P5.js
constrain我在 P5.js 编辑器中测试了新代码：https://editor.p5js.org，它似乎达到了你的预期。
新（工作）代码：
//game control ***(not used rn)***
let level = 0;
//gravity
let minHeight = 375;
let direction = 1;
let vel = 2;
let jumpPower = 10;
let fallingSpeed = 1;
let onPlatform = false; // NEW: check for whether the player is standing on a platform
//player setup and whatnot
let playerX = 400;
let playerY = 370;
let playerWidth = 30;
let playerHeight = 70;
//platform
let platX = 200;
let platY = 300;
let platWidth = 200;
let platHeight = 40;
function setup() {
createCanvas(800, 500);
rectMode(CENTER);
textAlign(CENTER);
}
function gravityControl() {
if (keyIsDown(32)) { // keycode 32 = spacebar
jump = true;
} else {
jump = false;
}
}
function draw() {
background(220);
movement();
gravityControl();
gravity();
if (level == 0) {
game();
}
}
function game() {
background(150, 230, 240);
//floor
noStroke();
fill(0, 255, 0);
rect(width / 2, 450, width, 100);
//platform
stroke(0);
strokeWeight(4);
fill(218,218,138);
rect(platX, platY, platWidth, platHeight);
//player
noStroke();
fill(255, 0, 0);
rect(playerX, playerY, playerWidth, playerHeight);
onPlatform = false; // This new boolean defaults to false unless the correct condition (see below) evaluates to true
//collisions (Added parentheses around each separate condition, and around mathematical expressions within each condition, for more readability)
// (Player y coordinate - half of player's height) = player's head: check for collisions with BOTTOM of platform
// (Player y coordinate + half of player's height) = player's feet: check for collisions with TOP of platform
if ((playerX >= (platX - platWidth/2)) && (playerX <= (platX + platWidth/2))) {
/* It looks like you're attempting to keep the player's y coordinate from changing once you hit the platform. However, just assigning the variable to itself won't accomplish this. */
//playerY = playerY; // This line does nothing: removed it
// Instead, you'll need the constrain() function: https://p5js.org/reference/#/p5/constrain
// If the player rectangle is BELOW the platform, constrain it not to rise any higher
if (((playerY - playerHeight/2) >= (platY - platHeight/2))) {
playerY = constrain(playerY, platY + platHeight/2 + playerHeight/2, height);
}
// If the player rectangle is ABOVE the platform, constrain it not to drop any lower
else if (((playerY + playerHeight/2) <= (platY + platHeight/2))) {
playerY = constrain(playerY, 0, platY - platHeight/2 - playerHeight/2);
if (playerY + playerHeight/2 >= platY - platHeight/2) {
onPlatform = true; // Don't drop through the platform; stand on it like a solid surface
}
}
}
}
function movement() {
if (keyIsDown(LEFT_ARROW)) {
playerX -= 3;
}
if(keyIsDown(RIGHT_ARROW)) {
playerX += 3;
}
}
/*
function mousePressed() {
fullscreen(true);
}
*/
function gravity() {
if (playerY >= minHeight && jump == false) {
if (playerY > minHeight) {
playerY = minHeight;
} //else { // This condition is unnecessary: inside the outer "if" statement, since you've already checked whether playerY is >= minHeight, it can't possibly be less than minHeight
//vel = fallingSpeed;
//}
//playerY = playerY + 0; This doesn't do anything: adding 0 to a number doesn't change it
}
else {
playerY = playerY + (direction * vel);
}
if (jump == true){
vel = -jumpPower;
} else if (!onPlatform) {
vel = fallingSpeed;
} else {
vel = 0;
}
}
function gravityControl() {
if (keyIsDown(32)) {
jump = true;
}
else {
jump = false;
}
}