neingeist
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30shooter
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improve enemy movement

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master
neingeist 12 years ago
parent 784d63a780
commit af23e757c3
1 changed files with 24 additions and 4 deletions
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28
herzle.js
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@ -2,6 +2,7 @@ debug = true;
player_pos = [0.5 * window.innerWidth, 0.9 * window.innerHeight];
enemy_pos = [0.5 * window.innerWidth, 0.1 * window.innerHeight];
new_enemy_pos = [enemy_pos[0], enemy_pos[1]];
pewpew = 0;
document.onkeydown = onKeyDown;
@ -114,7 +115,16 @@ function render() {
enemydiv.style.border = "1px solid";
}
function lerp(t, a, b) {
return (a + t*(b-a));
}
var a = 0;
function animate() {
// inc loop counter
a++;
// animate shoots
for(var i = 0; i < shoots.length; i++) {
if (shoots[i]) {
@ -131,12 +141,22 @@ function animate() {
}
// animate enemy
// every now and then change direction
var min = -50;
var max = +50;
var off = min + parseInt(Math.random() * (max-min));
enemy_pos[0] += off;
if (enemy_pos[0] < 0) enemy_pos[0] = 0;
if (enemy_pos[0] > window.innerWidth) enemy_pos[0] = window.innerWidth;
if (a % 15 == 0) {
var off = min + parseInt(Math.random() * (max-min));
new_enemy_pos[0] += off;
var off = min + parseInt(Math.random() * (max-min));
new_enemy_pos[1] += off;
if (new_enemy_pos[0] < 0) new_enemy_pos[0] = 0;
if (new_enemy_pos[0] > window.innerWidth) new_enemy_pos[0] = window.innerWidth;
if (new_enemy_pos[1] < 0.05 * window.innerHeight) new_enemy_pos[1] = 0.05 * window.innerHeight;
if (new_enemy_pos[1] > 0.5 * window.innerHeight) new_enemy_pos[0] = 0.5 * window.innerHeight;
}
// slowly move to desired position
enemy_pos[0] = lerp(0.15, enemy_pos[0], new_enemy_pos[0]);
enemy_pos[1] = lerp(0.15, enemy_pos[1], new_enemy_pos[1]);
}
function gameLoop() {