How to switch between 'scenes' using switch statement - switch-statement

Question

so I'm creating an interactive story, and I want to switch between scenes by clicking buttons (like a standard old pokemon game except there isn't movement, just clicking).
I should probably use a switch statement right? But I don't know how to implement the changing of scenes and loading scenes into the cases. I also don't know if I would need to use 'if' statements within the cases.
This might be confusing, because it is very confusing to me. I'd appreciate any help you guys offer! I am desperate ;)
Code so far is below:
//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);
}
}
}
Button 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

The source code below shows one possible approach to your question. It does not rely on ‘switch’ but instead uses a custom control with up and down buttons similar to a Java stepper. The stepper control value corresponds with images in the scenes array and the background() is set accordingly. A separate button class is required and code for this follows the demo.
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);
}
}
Button 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);
}
}