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More sprite math simplification.

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This commit is contained in:
Martin Haye 2013-10-19 12:14:19 -07:00
parent 724e6dc39e
commit 6aedf0b72d
1 changed files with 23 additions and 60 deletions
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83
Platform/Apple/virtual/src/raycast/javascript/intcast.js
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@ -30,20 +30,20 @@ var itemTypes = [
var mapItems = [
// lamps in center area
{type:3, x:9, y:7},
{type:3, x:15, y:7},
{type:3, x:9.5, y:7.5},
{type:3, x:15.5, y:7.5},
// lamps in bottom corridor
{type:3, x:5, y:12},
{type:3, x:11, y:12},
{type:3, x:11, y:12},
{type:3, x:5.5, y:12.5},
{type:3, x:11.5, y:12.5},
{type:3, x:11.5, y:12.5},
// tables in long bottom room
{type:0, x:10, y:10},
{type:0, x:11, y:10},
{type:0, x:10.5, y:10.5},
{type:0, x:11.5, y:10.5},
// lamps in long bottom room
{type:3, x:8, y:10},
{type:3, x:11, y:10}
{type:3, x:8.5, y:10.5},
{type:3, x:11.5, y:10.5}
];
// Player attributes [ref BigBlue2_10]
@ -152,7 +152,7 @@ function initSprites() {
sprite.img = img;
sprite.index = i;
spriteMap[sprite.y][sprite.x] = sprite;
spriteMap[parseInt(sprite.y)][parseInt(sprite.x)] = sprite;
screen.appendChild(img);
}
@ -364,67 +364,40 @@ function clearSprites() {
function renderSprites() {
var sinT = Math.sin(-playerAngle());
var cosT = Math.cos(-playerAngle());
for (var i=0;i<visibleSprites.length;i++) {
var sprite = visibleSprites[i];
var img = sprite.img;
img.style.display = "block";
// translate position to viewer space
var dx = sprite.x + 0.5 - player.x;
var dy = sprite.y + 0.5 - player.y;
var dx = sprite.x - player.x;
var dy = sprite.y - player.y;
// Use rotation matrix
var sinT = Math.sin(-playerAngle());
var cosT = Math.cos(-playerAngle());
// Apply rotation to the position
var rx = (dx * cosT) - (dy * sinT);
var ry = (dx * sinT) + (dy * cosT);
var rx = ((sprite.x + 0.5 - player.x) * cosT) - ((sprite.y + 0.5 - player.y) * sinT);
var ry = ((sprite.x + 0.5 - player.x) * sinT) + ((sprite.y + 0.5 - player.y) * cosT);
var sqDist2 = rx*rx + ry*ry;
var dist2 = Math.sqrt(sqDist2);
// distance to sprite
var dist = Math.sqrt(dx*dx + dy*dy);
// sprite angle relative to viewing angle
var spriteAngle = Math.atan2(dy, dx) - playerAngle();
dist *= Math.cos(spriteAngle);
if (options & 1)
dist = dist2;
//console.log("Sprite " + visibleSprites[i].index + ": dist=" + dist + ", dist2=" + dist2);
var sqDist = rx*rx + ry*ry;
var dist = Math.sqrt(sqDist);
// size of the sprite
var size = viewDist / dist;
if (size <= 0) continue;
// x-position on screen
var x = Math.tan(spriteAngle) * viewDist;
if (options & 1)
x = ry / dist2 * 252 / 0.38268343236509034;
var x = ry / dist * 252 / 0.38268343236509034;
img.style.left = (screenWidth/2 + x - size/2) + "px";
// y is constant since we keep all sprites at the same height and vertical position
img.style.top = ((screenHeight-size)/2)+"px";
var dbx = sprite.x - player.x;
var dby = sprite.y - player.y;
img.style.width = size + "px";
img.style.height = size + "px";
var blockDist = dx*dx + dy*dy;
if (options & 1)
blockDist = sqDist2;
var zIndex = -Math.floor(blockDist*1000)
if (options & 2)
zIndex = parseInt(size);
img.style.zIndex = zIndex;
console.log("visible sprite " + sprite.index + ": blockDist=" + blockDist +
", spriteAngle=" + spriteAngle + ", size=" + size +
", zIndex=" + zIndex);
img.style.zIndex = parseInt(size);
}
// hide the sprites that are no longer visible
@ -965,17 +938,7 @@ function drawStrip(stripIdx, lineData)
strip.oldStyles.clip = styleClip;
}
var dwx = lineData.xWallHit + 0.5 - player.x;
var dwy = lineData.yWallHit + 0.5 - player.y;
var wallDist = dwx*dwx + dwy*dwy;
var zIndex = -Math.floor(wallDist*1000)
if (options & 2)
zIndex = lineData.height;
strip.style.zIndex = zIndex;
if (stripIdx == debugRay)
console.log("wallDist=" + wallDist + ", zIndex=" + zIndex);
strip.style.zIndex = lineData.height;
}
function move() {