如何使用 switch 语句在 'scenes' 之间切换

Question

所以我正在创建一个交互式故事，我想通过单击按钮在场景之间切换（就像标准的旧口袋妖怪游戏，只是没有移动，只需单击）。

我应该使用 switch 语句吧？但是我不知道如何实现场景的改变和场景的加载到案例中。我也不知道我是否需要在案例中使用 'if' 语句。

这可能会令人困惑，因为这让我很困惑。我很感激你们提供的任何帮助！我很绝望;)

到目前为止的代码如下：

//PImages
PImage startScreen;
PImage[] waves = new PImage[3];
PImage[] scenes = new PImage[1];

int switchVariable;

//Objects
Button play;


void setup() {
  size(750, 600);
  background(#A3E9EA);
  
  //Initialising Objects
  play = new Button(50, 480, 330);
  
  //loading wave images
  waves[0] = loadImage("wave1.png");
  waves[1] = loadImage("wave2.png");
  waves[2] = loadImage("wave3.png");
  
  //loading start image
  startScreen = loadImage("start-screen.png");
  
  //loading scenes
  scenes[0] = loadImage("scene-one.png");
  
  //setting frame rate
  frameRate(6);
}


void draw() {
background(#A3E9EA);
frameCount++;
println (frameCount);

//drawing wave animation
  if (frameCount < 5) {
    image(waves[0], 0, 0);
  } 
  else {
    image(waves[1], 0, 0);
  } 
  
  if (frameCount < 15 & frameCount > 10) {
    background(#A3E9EA);
    image(waves[2], 0, 0);
    frameCount = 0;
  }
  
  //drawing start screen
  image(startScreen, 0, 0);
  
  //displaying play button
  if (play.visible) play.buttonDisplay();
}
  
  
void mousePressed() {
  
  if (play.visible) {
    float d = dist(play.x+110, play.y+22, mouseX, mouseY);
    if (d <= play.radius){
      background(#A3E9EA);
      image(scenes[0], 0, 0);
    }
  }
}

按钮Class:

class Button {
  float radius;
  float x;
  float y;
  PImage[] buttonImage = new PImage[2];
  boolean visible;
  
  Button(float _radius, float _x, float _y) {
    radius = _radius;
    visible = true;
    x = _x;
    y = _y;
    buttonImage[0] = loadImage("play-game-button.png");
  }
  
  void buttonDisplay() {
    image(buttonImage[0], x, y);
  }
}

Answer 1

下面的源代码显示了解决您的问题的一种可能方法。它不依赖于“开关”，而是使用类似于 Java 步进器的带有向上和向下按钮的自定义控件。步进控制值与场景数组中的图像相对应，并且相应地设置了 background()。需要一个单独的按钮 class，此代码遵循演示。

color BLUE = color(64, 124, 188);
color LTGRAY = color(185, 180, 180);
color YELLOW = color(245, 250, 13);
color RED = color(255, 0, 0);
color BLACK = color(0, 0, 0);
color WHITE = color(255, 255, 255);
color GREEN = color(0, 255, 0);
color ORANGE = color(247, 168, 7);

PFont font;

PImage[] scenes = new PImage[6];

// **** Up/Down Buttons init, min, max values **** //
final int _initValue = 2;
final int _maxValue = 5;
final int _minValue = 0;

int stepperValue = 0;

Button _up;
Button _dwn;
Button _quit;

final int _displayX = 160;
final int _displayY = 30;
final int _displayW = 100;
final int _displayH = 24;

final int _txtSize = 18;

void stepperValueDisplay(int value) {
  fill(WHITE); // background color
  noStroke();
  rect(_displayX, _displayY, _displayW, _displayH, 0);
  fill(BLACK); // text color
  textSize(_txtSize);
  textAlign(CENTER);
  String str = String.format("Scene %d", value);
  text(str, _displayX, _displayY, _displayW, _displayH);
}

void scene_0(){
  background(RED);
  save("scene0.png");
}

void scene_1(){
  background(GREEN);
  save("scene1.png");
}

void scene_2(){
  background(BLACK);
  save("scene2.png");
}

void scene_3(){
  background(YELLOW);
  save("scene3.png");
}

void scene_4(){
  background(LTGRAY);
 save("scene4.png"); 
}

void scene_5(){
  background(ORANGE);
 save("scene5.png"); 
}


void setup() {
  size(600, 600);
  background(BLUE);
  font = createFont("Menlo-Bold", 20);
  _dwn = new Button( _displayX - 40, _displayY, 40, 24, "--", LTGRAY, BLACK);
  _up = new Button( _displayX + _displayW, _displayY, 40, 24, "++", LTGRAY, BLACK);
  stepperValue = _initValue;
  _quit = new Button(width - 60, 20, 30, 24, "Q", LTGRAY, BLACK);
  scene_0();
  scene_1();
  scene_2();
  scene_3();
  scene_4();
  scene_5();
  scenes[0] = loadImage("scene0.png");
  scenes[1] = loadImage("scene1.png");
  scenes[2] = loadImage("scene2.png");
  scenes[3] = loadImage("scene3.png");
  scenes[4] = loadImage("scene4.png");
  scenes[5] = loadImage("scene5.png");
}

void draw() {
  background(scenes[stepperValue]);
  _up.display();
  _dwn.display();
  _quit.display();
  stepperValueDisplay(stepperValue);
}

void mousePressed() {
  if (mouseX > _quit.x && mouseX < _quit.x + _quit.w && mouseY > _quit.y && mouseY < _quit.y + _quit.h) {
    exit();
  }
  if (mouseX > _up.x && mouseX < _up.x + _up.w && mouseY > _up.y && mouseY < _up.y + _up.h) {
    stepperValue++;
    if (stepperValue > _maxValue) {
      stepperValue = _maxValue;
    }
    stepperValueDisplay(stepperValue);
  }
  if (mouseX > _dwn.x && mouseX < _dwn.x + _dwn.w && mouseY > _dwn.y && mouseY < _dwn.y + _dwn.h) {
    stepperValue--;
    if (stepperValue < _minValue) {
      stepperValue = _minValue;
    }
    stepperValueDisplay(stepperValue);
  }
}

按钮Class:

int _btnTxtSize = 18;

class Button {
 float x, y, w, h;
 String title;
 color bkgrndColor;
 color txtColor;

 // Constructor
 Button(int xpos, int ypos, float wt, float ht, String titleStr, color background, color textColor) {
   x = xpos;
   y = ypos;
   w = wt;
   h = ht;
   title = titleStr;
   bkgrndColor = background;
   txtColor = textColor;
 }
 
 void display(){
   fill(bkgrndColor);
   noStroke();
   rect( x, y, w, h, 0); 
   fill(txtColor);
   textSize(_btnTxtSize);
   textAlign(CENTER);
   text(title, x, y, w, h);
 }
 }

如何使用 switch 语句在 'scenes' 之间切换

How to switch between 'scenes' using switch statement

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