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Adding references to Big Blue's story, so they can be reliably searched and thus linked to.

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This commit is contained in:
Martin Haye
2013-09-29 11:46:49 -07:00
parent cb6637083b
commit fc0ccb441a
1 changed files with 8 additions and 4 deletions
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12
Platform/Apple/virtual/src/raycast/javascript/intcast.js
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@@ -19,6 +19,7 @@ var map = [
[1,2,3,3,3,2,2,1,2,4,2,2,2] [1,2,3,3,3,2,2,1,2,4,2,2,2]
]; ];
// Player attributes [ref BigBlue2a]
var player = { var player = {
x : 11.0, // current x, y position x : 11.0, // current x, y position
y : 10.5, y : 10.5,
@@ -107,6 +108,7 @@ function initScreen() {
} }
// Set up data tables prior to rendering [ref BigBlue2b]
function initCast() function initCast()
{ {
var i; var i;
@@ -262,7 +264,7 @@ function bindKeys() {
document.onkeydown = function(e) { document.onkeydown = function(e) {
e = e || window.event; e = e || window.event;
switch (e.keyCode) { // which key was pressed? switch (e.keyCode) { // which key was pressed? [ref BigBlue2c]
case 38: // up, move player forward, ie. increase speed case 38: // up, move player forward, ie. increase speed
player.speed = 1; player.speed = 1;
@@ -340,6 +342,7 @@ var prevY = -1;
var prevAngleNum = -1; var prevAngleNum = -1;
var prevOptions = -1; var prevOptions = -1;
// Cast all the rays from the player position and draw them [ref BigBlue2d]
function castRays(force) function castRays(force)
{ {
// If we're already showing this location and angle, no need to re-do it. // If we're already showing this location and angle, no need to re-do it.
@@ -558,8 +561,9 @@ function wallCalc(x, dist, bDir1, bDir2, bStep2)
*/ */
} }
// Let's try this with strictly integers. This should be the final // Cast one ray from the player's position through the map until we hit a wall.
// step before the Apple II code. // This version uses only strictly integers, making it easier to port to the
// 6502. [ref BigBlue2e]
// //
function intCast(x) function intCast(x)
{ {
@@ -626,7 +630,7 @@ function intCast(x)
var lineHeight; var lineHeight;
var bWallX; var bWallX;
// Perform DDA // Perform DDA - digital differential analysis
while (true) while (true)
{ {
// Jump to next map square in x-direction, OR in y-direction // Jump to next map square in x-direction, OR in y-direction