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downward motion to space invaders

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This commit is contained in:
ZappoMan 2014-02-03 13:22:34 -08:00
parent f1b612d8d8
commit 2b429ba2d3
1 changed files with 49 additions and 14 deletions
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63
examples/spaceInvadersExample.js
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@ -10,11 +10,14 @@
var iteration = 0;
var gameOver = false;
// horizontal movement of invaders
var invaderStepsPerCycle = 30; // the number of update steps it takes then invaders to move one column to the right
var invaderStepOfCycle = 0; // current iteration in the cycle
var invaderMoveDirection = 1; // 1 for moving to right, -1 for moving to left
var itemLifetimes = 60;
var itemLifetimes = 60 * 2; // 2 minutes
var gameAt = { x: 10, y: 0, z: 10 };
var gameSize = { x: 10, y: 20, z: 1 };
var middleX = gameAt.x + (gameSize.x/2);
@ -34,6 +37,16 @@ var invadersBottomCorner = { x: gameAt.x, y: middleY , z: gameAt.z };
var rowHeight = ((gameAt.y + gameSize.y) - invadersBottomCorner.y) / numberOfRows;
var columnWidth = gameSize.x / (invadersPerRow + emptyColumns);
// vertical movement of invaders
var invaderRowOffset = 0;
var stepsPerRow = 20; // number of steps before invaders really move a whole row down.
var yPerStep = rowHeight/stepsPerRow;
var stepsToGround = (middleY - gameAt.y) / yPerStep;
var maxInvaderRowOffset=stepsToGround;
var missileFired = false;
var myMissile;
@ -52,16 +65,19 @@ function initializeMyShip() {
// calculate the correct invaderPosition for an column row
function getInvaderPosition(row, column) {
var xMovePart = 0;
var xBasePart = invadersBottomCorner.x + (column * columnWidth);
var xMovePart = 0;
if (invaderMoveDirection > 0) {
xMovePart = (invaderMoveDirection * columnWidth * (invaderStepOfCycle/invaderStepsPerCycle));
} else {
xMovePart = columnWidth + (invaderMoveDirection * columnWidth * (invaderStepOfCycle/invaderStepsPerCycle));
}
var y = invadersBottomCorner.y + (row * rowHeight) - (invaderRowOffset * rowHeight/stepsPerRow);
var invaderPosition = {
x: xBasePart + xMovePart,
y: invadersBottomCorner.y + (row * rowHeight),
y: y,
z: invadersBottomCorner.z };
return invaderPosition;
@ -88,7 +104,7 @@ function initializeInvaders() {
}
function moveInvaders() {
print("moveInvaders()...");
//print("moveInvaders()...");
for (var row = 0; row < numberOfRows; row++) {
for (var column = 0; column < invadersPerRow; column++) {
props = Particles.getParticleProperties(invaders[row][column]);
@ -100,19 +116,38 @@ function moveInvaders() {
}
}
function displayGameOver() {
gameOver = true;
print("Game over...");
}
function update() {
print("updating space invaders... iteration="+iteration);
iteration++;
invaderStepOfCycle++;
if (invaderStepOfCycle > invaderStepsPerCycle) {
invaderStepOfCycle = 0;
if (invaderMoveDirection > 0) {
invaderMoveDirection = -1;
} else {
invaderMoveDirection = 1;
if (!gameOver) {
//print("updating space invaders... iteration="+iteration);
iteration++;
invaderStepOfCycle++;
if (invaderStepOfCycle > invaderStepsPerCycle) {
// handle left/right movement
invaderStepOfCycle = 0;
if (invaderMoveDirection > 0) {
invaderMoveDirection = -1;
} else {
invaderMoveDirection = 1;
}
// handle downward movement
invaderRowOffset++; // move down one row
print("invaderRowOffset="+invaderRowOffset);
// check to see if invaders have reached "ground"...
if (invaderRowOffset > maxInvaderRowOffset) {
displayGameOver();
return;
}
}
moveInvaders();
}
moveInvaders();
}
// register the call back so it fires before each data send