处理冲突测试一开始返回false

float x;
float y;
float w;
float h;
float xPed;
float yPed;
float yPedc;
float objectX;
float objectY;
float objectWidth;
float objectHeight;
float triangleWidth;
float triangleHeight;
float dia;
int speed = 2;
boolean gameOver;
int N_LANES = 1;
void setup() {
size(1200, 400);
background(255);
x = width / 60;
y = height / 40;
w = width / 80;
xPed = width / 2;
triangleWidth = height / 4;
triangleHeight = 2.5 * w;
yPed = height - 3 * w;
yPedc = 2.5 * w / 2;
dia = w / 2;
h = w / 2;
objectX = x + 2 * w;
objectY = y + 5 * h;
objectWidth = 4 * w;
objectHeight = 10 * h;
gameOver = false;
}
void  draw() {
//reset background
background(255);
line(0, height/4, width, height/4);

vehicle();
pedestrian();
// collision detect
if (gameOver == true) {
textSize(100);
fill(255, 0, 0);
text("Game Over", width / 3, height / 2);
}
}
void vehicle() {
//moving vehicle
x += speed;
// reset vehicle
noFill();
if (x > width) {
x = 0;
} else if (x < 0) {
x = width;
}

for (int i = 0; i < N_LANES; i++) {
//head of vehicle
fill(0, 194, 0, 50);
rect(x, y, w, h);
rect(x + 3 * w, y, w, h);
rect(x, y + h, 4 * w, 4 *h);
//eyes of vehicle
fill(0);
rect(x + w, 3 * y, w * 0.85, h);
rect(x + 3 * w, 3 * y, w * 0.85, h);
//body of vehicle
fill(0, 240, 0, 80);
rect(x + 1.5 * w, 6.3 * h, 1.5 * w, 3 *h );
//left arm
line(x + 1.5 *w, 6.3 * h, x + 0.5 * w, 7.3 * h);
//right arm
line(x + 3 * w, 6.3 * h, x + 4 * w, 7.3 * h);
//left leg 
line(x + 1.5 * w, 9.3 * h, x + w, 11.3 * h);
//right leg
line(x + 3 * w, 9.3 * h, x + 3.5 * w, 11.3 * h);
}
}
// draw pedestrian
void pedestrian() {
fill(255, 140, 0, 70);
//body of pedestrian
triangle(xPed, yPed, xPed - triangleWidth / 2, yPed + 2.5 * w, xPed + triangleWidth / 2, yPed + 2.5 * w);
fill(0);
circle(xPed + triangleWidth / 4, yPed, dia);
circle(xPed - triangleWidth / 4, yPed, dia);
fill(255, 165, 0);
ellipse(xPed, yPed + w, 1.5 * dia, 3 * dia);

}
// arrow key moving
void keyPressed() {
if (gameOver != true) {
if (key == CODED) {
if (keyCode == UP) {
yPed -= height / 4;
if (yPed <= 0) {
yPed = height - 3 * w;
}
}
if (keyCode == DOWN) {
yPed += height / 4;
if (yPed > height) {
yPed = height - 3 * w;
}
}
if (keyCode==LEFT) {
xPed -= height / 4;
if (xPed < 0 + triangleWidth / 2) {
xPed = width / 2;
}
}
if (keyCode==RIGHT) {
xPed += height / 4;
if (xPed > width - triangleWidth / 2) {
xPed = width / 2;
}
}
}
}
}
boolean gameOver() {
// optional visualise collision objects
rect(objectX, objectY, objectWidth, objectHeight);
rect(xPed, yPed, triangleWidth, triangleHeight);
// x axis
float distX = abs( (objectX + objectWidth / 2) - (xPed + triangleWidth / 2) );
// y axis
float distY = abs( (objectY + objectHeight / 2) - (yPedc + triangleHeight / 2) );
// half combined x distance
float combinedHalfWidth = ( (objectWidth / 2) + (triangleWidth / 2) );
// half combined y distance
float combinedHalfHeight = ( (objectHeight / 2) + (triangleHeight / 2) );

// check collision
if (distX < combinedHalfWidth) {
if (distY < combinedHalfHeight) {
return true;
}
}

return false;
}

让我们假设代码是从带有代码片段的pdf中复制的，这就是格式混乱的原因。

代码仍然有一些明显的错误：

• 令人困惑的是，您同时使用了布尔变量gameOver和布尔函数gameOver()，并且该变量并不总是更新的。(事实上，gameOver在setup()中只设置了一次，而实际进行碰撞检测的gameOver()从未被调用(。我建议更新布尔变量，或者更简单，只需根据需要调用gameOver()来计算冲突。这是您的代码无法按预期运行的原因之一
• 您正在检查两个对象之间的碰撞：车辆和行人。但是，有三组坐标：x, y, xPed, objectX, objectY。在绘制中渲染时，车辆使用x,y，但在检查碰撞时，gameOver()使用objectX, objectY(不匹配且未更新(。这是碰撞行为不符合预期的另一个原因
• 除了您提出的问题之外，N_LANES在for循环中使用，但从未声明。即使我声明了它，for循环也使用完全相同的x,y坐标，从而使for循环变得多余

这是一个格式化的代码版本，带有额外的边界框，突出显示碰撞函数正在检查的内容(并注释一些未使用的变量(：

float x;
float y;
float w;
float h;
float xPed;
float yPed;
//float yPedc;
float objectX;
float objectY;
float objectWidth;
float objectHeight;
float triangleWidth;
float triangleHeight;
float dia;
int speed = 2;
//boolean gameOver;
int N_LANES = 1;
void setup() {
size(1200, 400);
background(255);
x = width / 60;
y = height / 40;
w = width / 80;
xPed = width / 2;
triangleWidth = height / 4;
triangleHeight = 2.5 * w;
yPed = height - 3 * w;
//yPedc = 2.5 * w / 2;
dia = w / 2;
h = w / 2;
objectX = x + 2 * w;
objectY = y + 5 * h;
objectWidth = 4 * w;
objectHeight = 10 * h;
//gameOver = false;
}
void  draw() {
//reset background
background(255);
line(0, height/4, width, height/4);

vehicle();
pedestrian();
// collision detect
if (gameOver() == true) {
textSize(100);
fill(255, 0, 0);
text("Game Over", width / 3, height / 2);
}
}
void vehicle() {
//moving vehicle
x += speed;
// reset vehicle
noFill();
if (x > width) {
x = 0;
} else if (x < 0) {
x = width;
}

for (int i = 0; i < N_LANES; i++) {
//head of vehicle
fill(0, 194, 0, 50);
rect(x, y, w, h);
rect(x + 3 * w, y, w, h);
rect(x, y + h, 4 * w, 4 *h);
//eyes of vehicle
fill(0);
rect(x + w, 3 * y, w * 0.85, h);
rect(x + 3 * w, 3 * y, w * 0.85, h);
//body of vehicle
fill(0, 240, 0, 80);
rect(x + 1.5 * w, 6.3 * h, 1.5 * w, 3 *h );
//left arm
line(x + 1.5 *w, 6.3 * h, x + 0.5 * w, 7.3 * h);
//right arm
line(x + 3 * w, 6.3 * h, x + 4 * w, 7.3 * h);
//left leg 
line(x + 1.5 * w, 9.3 * h, x + w, 11.3 * h);
//right leg
line(x + 3 * w, 9.3 * h, x + 3.5 * w, 11.3 * h);
}
}
// draw pedestrian
void pedestrian() {
fill(255, 140, 0, 70);
//body of pedestrian
triangle(xPed, yPed, xPed - triangleWidth / 2, yPed + 2.5 * w, xPed + triangleWidth / 2, yPed + 2.5 * w);
fill(0);
circle(xPed + triangleWidth / 4, yPed, dia);
circle(xPed - triangleWidth / 4, yPed, dia);
fill(255, 165, 0);
ellipse(xPed, yPed + w, 1.5 * dia, 3 * dia);

// visualise bounding box
//fill(255, 140, 0, 70);
//rect(xPed - triangleWidth / 2, yPed, triangleWidth, triangleHeight);
}
// arrow key moving
void keyPressed() {
if (gameOver() != true) {
if (key == CODED) {
if (keyCode == UP) {
yPed -= height / 4;
if (yPed <= 0) {
yPed = height - 3 * w;
}
}
if (keyCode == DOWN) {
yPed += height / 4;
if (yPed > height) {
yPed = height - 3 * w;
}
}
if (keyCode==LEFT) {
xPed -= height / 4;
if (xPed < 0 + triangleWidth / 2) {
xPed = width / 2;
}
}
if (keyCode==RIGHT) {
xPed += height / 4;
if (xPed > width - triangleWidth / 2) {
xPed = width / 2;
}
}
}
}
}
boolean gameOver() {
// optional visualise collision objects
rect(objectX, objectY, objectWidth, objectHeight);
rect(xPed, yPed, triangleWidth, triangleHeight);
// x axis
float distX = abs( (objectX + objectWidth / 2) - (xPed + triangleWidth / 2) );
// y axis
float distY = abs( (objectY + objectHeight / 2) - (yPed + triangleHeight / 2) );
// half combined x distance
float combinedHalfWidth = ( (objectWidth / 2) + (triangleWidth / 2) );
// half combined y distance
float combinedHalfHeight = ( (objectHeight / 2) + (triangleHeight / 2) );

// check collision
if (distX < combinedHalfWidth) {
if (distY < combinedHalfHeight) {
return true;
}
}

return false;
}

以下是应用了上述3个注释中的一些注释的代码版本，在一定程度上解决了冲突和gameOver状态问题：

float x;
float y;
float w;
float h;
float xPed;
float yPed;
float objectWidth;
float objectHeight;
float triangleWidth;
float triangleHeight;
float dia;
int speed = 2;
void setup() {
size(1200, 400);
background(255);
x = width / 60;
y = height / 40;
w = width / 80;
xPed = width / 2;
triangleWidth = height / 4;
triangleHeight = 2.5 * w;
yPed = height - 3 * w;
dia = w / 2;
h = w / 2;
objectWidth = 4 * w;
objectHeight = 10 * h;
}
void  draw() {
//reset background
background(255);
line(0, height/4, width, height/4);

vehicle();
pedestrian();
// collision detect
if (gameOver()) {
textSize(100);
fill(255, 0, 0);
text("Game Over", width / 3, height / 2);
}
}
void vehicle() {
//moving vehicle
x += speed;
// reset vehicle
noFill();
if (x > width) {
x = 0;
} else if (x < 0) {
x = width;
}

//head of vehicle
fill(0, 194, 0, 50);
rect(x, y, w, h);
rect(x + 3 * w, y, w, h);
rect(x, y + h, 4 * w, 4 *h);
//eyes of vehicle
fill(0);
rect(x + w, 3 * y, w * 0.85, h);
rect(x + 3 * w, 3 * y, w * 0.85, h);
//body of vehicle
fill(0, 240, 0, 80);
rect(x + 1.5 * w, 6.3 * h, 1.5 * w, 3 *h );
//left arm
line(x + 1.5 *w, 6.3 * h, x + 0.5 * w, 7.3 * h);
//right arm
line(x + 3 * w, 6.3 * h, x + 4 * w, 7.3 * h);
//left leg 
line(x + 1.5 * w, 9.3 * h, x + w, 11.3 * h);
//right leg
line(x + 3 * w, 9.3 * h, x + 3.5 * w, 11.3 * h);
}
// draw pedestrian
void pedestrian() {
fill(255, 140, 0, 70);
//body of pedestrian
triangle(xPed, yPed, xPed - triangleWidth / 2, yPed + 2.5 * w, xPed + triangleWidth / 2, yPed + 2.5 * w);
fill(0);
circle(xPed + triangleWidth / 4, yPed, dia);
circle(xPed - triangleWidth / 4, yPed, dia);
fill(255, 165, 0);
ellipse(xPed, yPed + w, 1.5 * dia, 3 * dia);

// visualise bounding box
//fill(255, 140, 0, 70);
//rect(xPed - triangleWidth / 2, yPed, triangleWidth, triangleHeight);
}
// arrow key moving
void keyPressed() {
if (!gameOver()) {
if (key == CODED) {
if (keyCode == UP) {
yPed -= height / 4;
if (yPed <= 0) {
yPed = height - 3 * w;
}
}
if (keyCode == DOWN) {
yPed += height / 4;
if (yPed > height) {
yPed = height - 3 * w;
}
}
if (keyCode==LEFT) {
xPed -= height / 4;
if (xPed < 0 + triangleWidth / 2) {
xPed = width / 2;
}
}
if (keyCode==RIGHT) {
xPed += height / 4;
if (xPed > width - triangleWidth / 2) {
xPed = width / 2;
}
}
}
}
}
boolean gameOver() {
// optional visualise collision objects
rect(x, y, objectWidth, objectHeight);
rect(xPed, yPed, triangleWidth, triangleHeight);
// x axis
float distX = abs( (x + objectWidth / 2) - (xPed + triangleWidth / 2) );
// y axis
float distY = abs( (y + objectHeight / 2) - (yPed + triangleHeight / 2) );
// half combined x distance
float combinedHalfWidth = ( (objectWidth / 2) + (triangleWidth / 2) );
// half combined y distance
float combinedHalfHeight = ( (objectHeight / 2) + (triangleHeight / 2) );

// check collision
if (distX < combinedHalfWidth) {
if (distY < combinedHalfHeight) {
return true;
}
}

return false;
}

请注意，理想情况下，三角形边界框需要向左移动三角形宽度的一半。

我还想向您介绍java.awt.Rectangle，它有一个可能有用的intersects()：

import java.awt.Rectangle;
float x;
float y;
float w;
float h;
float xPed;
float yPed;
float objectWidth;
float objectHeight;
float triangleWidth;
float triangleHeight;
float dia;
int speed = 2;
Rectangle vehicleBoundingBox;
Rectangle pedestrianBoundingBox;
void setup() {
size(1200, 400);
background(255);
x = width / 60;
y = height / 40;
w = width / 80;
xPed = width / 2;
triangleWidth = height / 4;
triangleHeight = 2.5 * w;
yPed = height - 3 * w;
dia = w / 2;
h = w / 2;
objectWidth = 4 * w;
objectHeight = 10 * h;

vehicleBoundingBox = new Rectangle((int)x, (int)y, (int)objectWidth, (int)objectHeight);
pedestrianBoundingBox = new Rectangle((int)xPed, (int)yPed, (int)triangleWidth, (int)triangleHeight);
}
void  draw() {
//reset background
background(255);
line(0, height/4, width, height/4);

vehicle();
pedestrian();
// collision detect
if (gameOver()) {
textSize(100);
fill(255, 0, 0);
text("Game Over", width / 3, height / 2);
}
}
void vehicle() {
//moving vehicle
x += speed;
// reset vehicle
noFill();
if (x > width) {
x = 0;
} else if (x < 0) {
x = width;
}

//head of vehicle
fill(0, 194, 0, 50);
rect(x, y, w, h);
rect(x + 3 * w, y, w, h);
rect(x, y + h, 4 * w, 4 *h);
//eyes of vehicle
fill(0);
rect(x + w, 3 * y, w * 0.85, h);
rect(x + 3 * w, 3 * y, w * 0.85, h);
//body of vehicle
fill(0, 240, 0, 80);
rect(x + 1.5 * w, 6.3 * h, 1.5 * w, 3 *h );
//left arm
line(x + 1.5 *w, 6.3 * h, x + 0.5 * w, 7.3 * h);
//right arm
line(x + 3 * w, 6.3 * h, x + 4 * w, 7.3 * h);
//left leg 
line(x + 1.5 * w, 9.3 * h, x + w, 11.3 * h);
//right leg
line(x + 3 * w, 9.3 * h, x + 3.5 * w, 11.3 * h);
}
// draw pedestrian
void pedestrian() {
fill(255, 140, 0, 70);
//body of pedestrian
triangle(xPed, yPed, xPed - triangleWidth / 2, yPed + 2.5 * w, xPed + triangleWidth / 2, yPed + 2.5 * w);
fill(0);
circle(xPed + triangleWidth / 4, yPed, dia);
circle(xPed - triangleWidth / 4, yPed, dia);
fill(255, 165, 0);
ellipse(xPed, yPed + w, 1.5 * dia, 3 * dia);
}
// arrow key moving
void keyPressed() {
if (!gameOver()) {
if (key == CODED) {
if (keyCode == UP) {
yPed -= height / 4;
if (yPed <= 0) {
yPed = height - 3 * w;
}
}
if (keyCode == DOWN) {
yPed += height / 4;
if (yPed > height) {
yPed = height - 3 * w;
}
}
if (keyCode==LEFT) {
xPed -= height / 4;
if (xPed < 0 + triangleWidth / 2) {
xPed = width / 2;
}
}
if (keyCode==RIGHT) {
xPed += height / 4;
if (xPed > width - triangleWidth / 2) {
xPed = width / 2;
}
}
}
}
}
boolean gameOver(){
// update bounding box positions
vehicleBoundingBox.x = (int)x;
vehicleBoundingBox.y = (int)y;

pedestrianBoundingBox.x = (int)(xPed - triangleWidth / 2);
pedestrianBoundingBox.y = (int)yPed;
//optional: visualise boxes
fill(255, 140, 0, 70);
rect(pedestrianBoundingBox.x, pedestrianBoundingBox.y, pedestrianBoundingBox.width, pedestrianBoundingBox.height);
rect(vehicleBoundingBox.x, vehicleBoundingBox.y, vehicleBoundingBox.width, vehicleBoundingBox.height);

return vehicleBoundingBox.intersects(pedestrianBoundingBox);
}
//boolean gameOver() {
//    // optional visualise collision objects
//    rect(x, y, objectWidth, objectHeight);
//    rect(xPed, yPed, triangleWidth, triangleHeight);
//    // x axis
//    float distX = abs( (x + objectWidth / 2) - (xPed + triangleWidth / 2) );
//    // y axis
//    float distY = abs( (y + objectHeight / 2) - (yPed + triangleHeight / 2) );
//    // half combined x distance
//    float combinedHalfWidth = ( (objectWidth / 2) + (triangleWidth / 2) );
//    // half combined y distance
//    float combinedHalfHeight = ( (objectHeight / 2) + (triangleHeight / 2) );

//    // check collision
//    if (distX < combinedHalfWidth) {
//        if (distY < combinedHalfHeight) {
//            return true;
//        }
//    }

//    return false;
//}
void circle(float x, float y, float dia){
ellipse(x, y, dia, dia);
}

请记住，如果这是一项作业/家庭作业，你可能不被允许使用java.awt.Regangle。说到这里，如果这项作业，你应该在问题中提到这一点。

更新

这是一个更新版本，可以更好地处理游戏。

float x;
float y;
float w;
float h;
float xPed;
float yPed;
float objectWidth;
float objectHeight;
float triangleWidth;
float triangleHeight;
float dia;
int speed = 2;
// defaults to false
boolean isGameOver;
void setup() {
size(1200, 400);
background(255);
x = width / 60;
y = height / 40;
w = width / 80;
xPed = width / 2;
triangleWidth = height / 4;
triangleHeight = 2.5 * w;
yPed = height - 3 * w;
dia = w / 2;
h = w / 2;
objectWidth = 4 * w;
objectHeight = 10 * h;
}
void  draw() {
//reset background
background(255);
line(0, height/4, width, height/4);

if (isGameOver) {
textSize(100);
fill(255, 0, 0);
text("Game Over", width / 3, height / 2);
}else{
// check colloisions only in game state and update game over state
isGameOver = checkCollisions();
vehicle();
pedestrian();
}

}
void vehicle() {
//moving vehicle
x += speed;
// reset vehicle
noFill();
if (x > width) {
x = 0;
} else if (x < 0) {
x = width;
}
//head of vehicle
fill(0, 194, 0, 50);
rect(x, y, w, h);
rect(x + 3 * w, y, w, h);
rect(x, y + h, 4 * w, 4 *h);
//eyes of vehicle
fill(0);
rect(x + w, 3 * y, w * 0.85, h);
rect(x + 3 * w, 3 * y, w * 0.85, h);
//body of vehicle
fill(0, 240, 0, 80);
rect(x + 1.5 * w, 6.3 * h, 1.5 * w, 3 *h );
//left arm
line(x + 1.5 *w, 6.3 * h, x + 0.5 * w, 7.3 * h);
//right arm
line(x + 3 * w, 6.3 * h, x + 4 * w, 7.3 * h);
//left leg 
line(x + 1.5 * w, 9.3 * h, x + w, 11.3 * h);
//right leg
line(x + 3 * w, 9.3 * h, x + 3.5 * w, 11.3 * h);
}
// draw pedestrian
void pedestrian() {
fill(255, 140, 0, 70);
//body of pedestrian
triangle(xPed, yPed, xPed - triangleWidth / 2, yPed + 2.5 * w, xPed + triangleWidth / 2, yPed + 2.5 * w);
fill(0);
circle(xPed + triangleWidth / 4, yPed, dia);
circle(xPed - triangleWidth / 4, yPed, dia);
fill(255, 165, 0);
ellipse(xPed, yPed + w, 1.5 * dia, 3 * dia);
// visualise bounding box
//fill(255, 140, 0, 70);
//rect(xPed - triangleWidth / 2, yPed, triangleWidth, triangleHeight);
}
// arrow key moving
void keyPressed() {
if (isGameOver){
// exit game over
isGameOver = false;
// lazy way to restart the game
// normally you'd write & call a reset() function to reset player/vehicle positions, avodiing instant gameOver
setup();
} else {
if (key == CODED) {
if (keyCode == UP) {
yPed -= height / 4;
if (yPed <= 0) {
yPed = height - 3 * w;
}
}
if (keyCode == DOWN) {
yPed += height / 4;
if (yPed > height) {
yPed = height - 3 * w;
}
}
if (keyCode==LEFT) {
xPed -= height / 4;
if (xPed < 0 + triangleWidth / 2) {
xPed = width / 2;
}
}
if (keyCode==RIGHT) {
xPed += height / 4;
if (xPed > width - triangleWidth / 2) {
xPed = width / 2;
}
}
}
}
}
boolean checkCollisions() {
// optional visualise collision objects
fill(255, 140, 0, 70);
rect(x, y, objectWidth, objectHeight);
rect(xPed - triangleWidth / 2, yPed, triangleWidth, triangleHeight);
// x axis
float distX = abs( (x + objectWidth / 2) - xPed );
// y axis
float distY = abs( (y + objectHeight / 2) - (yPed + triangleHeight / 2) );
// half combined x distance
float combinedHalfWidth = ( (objectWidth / 2) + (triangleWidth / 2) );
// half combined y distance
float combinedHalfHeight = ( (objectHeight / 2) + (triangleHeight / 2) );
// check collision
if (distX < combinedHalfWidth) {
if (distY < combinedHalfHeight) {
return true;
}
}
return false;
}

主要变化是：

• 将gameOver布尔值重新引入为isGameOver，用于在两种状态之间进行更改
• 将CCD_ 19重命名为CCD_

在这种情况下，只有两个状态，布尔值就可以了。在改变状态时重置游戏变量也很重要(例如重置玩家/车辆位置等(如果你的游戏可能需要更多的状态，你可以使用一个整数和常数。这个答案有一个演示代码片段。如果需要多个状态OOP，这个答案也有演示代码。