In this program your code will take on a 'life of its own' with the random() command. It's exciting to see that your program can do something beyond your own prediction.

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/* * Now that you've got the wall set as a variable, it's possible to * make use of the added flexibility. The most straightforward way * to do that is to make the wall change position every new 'level'. * * To make this happen, you'll add in an additional piece of code * when JumpMan is reset at the edge of the screen to move the wall. * */ #include "MakerScreenXVI.h" MakerScreenXVI lcd; byte run0[8] = { //legs in partial stride 0b00000, 0b01100, 0b01100, 0b01100, 0b01110, 0b01100, 0b01010, 0b01010 }; byte run1[8] = { //legs in full stride 0b00000, 0b01100, 0b01100, 0b01111, 0b01100, 0b01100, 0b01010, 0b10001 }; byte wall[8] = { //wall obstacle 0b11111, 0b10101, 0b11111, 0b10001, 0b11111, 0b10101, 0b11111, 0b10001 }; byte crash[8] = { //crashed JumpMan 0b00000, 0b00011, 0b01011, 0b00111, 0b00011, 0b00011, 0b00001, 0b00001 }; int position = 0; //holds the changing position of the cursor bool runState = 0; //which running animation to draw (0 or 1). int jumpState = 0; //0 ='pre-jump', 1 ='mid jump', 2='post jump' bool buttonState = 0; //will equal 1 after press, 0 after jump completed //Integer for the position of the wall int wallPosition = 14; //wall can be placed from 0 to 15 long animationTimer; //tracks animation (custom character) updates long runTimer; //tracks position updates void setup() { lcd.begin(); lcd.backlightOn(); lcd.createChar(0, run0); //partial stride character lcd.createChar(1, run1); //full stride character lcd.createChar(2, wall); //wall character in 'slot' 2 of custom characters lcd.createChar(3, crash); //splatted character against the wall pinMode(6,INPUT_PULLUP); //button to trigger jump //Start both timers equal to millis() so that the difference between //millis and the variables is 0. animationTimer = millis(); runTimer = millis(); } void loop() { //Set the cursor depending on the state of the character if (jumpState == 0){ lcd.setCursor(position,1); } else if (jumpState == 1){ lcd.setCursor(position,0); } else if (jumpState == 2){ lcd.setCursor(position,1); } lcd.write(runState); //draw the run0 or run1 animation lcd.setCursor(wallPosition,1); lcd.write(2); //draw wall if ((digitalRead(6) == LOW)&&(jumpState == 0)){ buttonState = 1; //1 means a press is recorded } //Button is unpressed and a jump has been completed if ((digitalRead(6) == HIGH)&&(jumpState == 2)){ jumpState = 0; } if (millis() - animationTimer > 300){//Update animation every 300 ms runState = 1 - runState; //draw the next JumpMan animation animationTimer = millis(); lcd.clear(); //clear the LCD to draw a new character } if (millis() - runTimer > 600){ //Every 600 milliseconds, run this... position = position + 1; //move character one space to the right if (position == 16){ /* * This is the reset for when JumpMan is at the edge of the * screen, so it is the most appropriate place to put the * code for moving the wall. At the same time he starts a new * level, the wall will be placed somewhere new. * * The function 'random' is built in to the Arduino software, so you * don't have to make it in your code. It takes two arguments as a * range to choose from and returns a number between those arguments. * The range 3-16 ensures that the wall won't be set too close to the * left side of the screen or at some location not on the screen. * Random excludes the highest number from the range, so (3,16) is 3-15. */ wallPosition = random(3,16); //place wall in column 3 through 15 position = 0; } //if button has been pressed and a jump hasn't been initiated... if ((buttonState == 1)&&(jumpState == 0)){ jumpState = 1; //signal a jump buttonState = 0; //reset button to 'unpressed' in the code } else if (jumpState == 1){//true if jumpState set to one in the last loop jumpState = 2; //jump is marked as complete } if ((position == wallPosition)&&(jumpState != 1)){//check for a crash drawCrash(); } lcd.clear(); runTimer = millis(); } } void drawCrash(){ lcd.clear(); lcd.setCursor(position-1,1); //move cursor one position left of the collision lcd.write(3);//draw 'splatted' JumpMan lcd.setCursor(wallPosition,1); lcd.write(2); //draw the wall delay(1000); // Reset the variables to put the JumpMan back at the starting point position = 0; buttonState = 0; jumpState = 0; } /* * In this lesson, you took advantage of a feature (that the wall's * position was made into a variable in the code), and used it * to add an element in the game. * * The ability to make one change in one location is a benefit of variables. */ //(c) 2017 Let's Start Coding. License:

Here's a lesson in which very little coding changes your entire game experience! You'll continue to use random in JumpMan to make your game more interesting.