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Paddle: add a little randomization in the dy speed

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To make the game a bit more challenging an less predictable add a little
bit of randomness to the `dy` value. When hitting the right wall add a random
number (one of [-1, 0, 1]) to the `dy` value.

To keep the difficulty level managable limit the dy value to be in the
range from -5 to 5.
This commit is contained in:
Reinhold Gschweicher 2021-10-30 22:25:42 +02:00 committed by JF
parent ada96ccdc8
commit 054a99cf6c
1 changed files with 9 additions and 0 deletions
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9
src/displayapp/screens/Paddle.cpp
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@ -2,6 +2,8 @@
#include "displayapp/DisplayApp.h" #include "displayapp/DisplayApp.h"
#include "displayapp/LittleVgl.h" #include "displayapp/LittleVgl.h"
#include <cstdlib> // for rand()
using namespace Pinetime::Applications::Screens; using namespace Pinetime::Applications::Screens;
Paddle::Paddle(Pinetime::Applications::DisplayApp* app, Pinetime::Components::LittleVgl& lvgl) : Screen(app), lvgl {lvgl} { Paddle::Paddle(Pinetime::Applications::DisplayApp* app, Pinetime::Components::LittleVgl& lvgl) : Screen(app), lvgl {lvgl} {
@ -50,6 +52,13 @@ void Paddle::Refresh() {
// checks if it has touched the side (right side) // checks if it has touched the side (right side)
if (ballX >= LV_HOR_RES - ballSize - 1) { if (ballX >= LV_HOR_RES - ballSize - 1) {
dx *= -1; dx *= -1;
dy += rand() % 3 - 1; // add a little randomization in wall bounce direction, one of [-1, 0, 1]
if (dy > 5) { // limit dy to be in range [-5 to 5]
dy = 5;
}
if (dy < -5) {
dy = -5;
}
} }
// checks if it is in the position of the paddle // checks if it is in the position of the paddle