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Add rotation center and bitmap/costume resolution (#51)

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Tim Mickel 2016-10-19 17:02:04 -04:00 committed by GitHub
parent a484fda1a6
commit 2cffa7b643
1 changed files with 27 additions and 5 deletions
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32
src/Drawable.js
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@ -60,6 +60,7 @@ class Drawable {
this._position = twgl.v3.create(0, 0);
this._scale = twgl.v3.create(100, 100);
this._rotationCenter = twgl.v3.create(0, 0);
this._direction = 90;
this._transformDirty = true;
this._visible = true;
@ -157,8 +158,9 @@ Drawable.prototype.getID = function () {
* The Drawable will continue using the existing skin until the new one loads.
* If there is no existing skin, the Drawable will use a 1x1 transparent image.
* @param {string} skin_url The URL of the skin.
* @param {number=} opt_costumeResolution Optionally, a resolution for the skin.
*/
Drawable.prototype.setSkin = function (skin_url) {
Drawable.prototype.setSkin = function (skin_url, opt_costumeResolution) {
// TODO: cache Skins instead of loading each time. Ref count them?
// TODO: share Skins across Drawables - see also destroy()
if (skin_url) {
@ -171,7 +173,7 @@ Drawable.prototype.setSkin = function (skin_url) {
this._setSkinSVG(skin_url);
break;
default:
this._setSkinBitmap(skin_url);
this._setSkinBitmap(skin_url, opt_costumeResolution);
break;
}
}
@ -213,11 +215,13 @@ Drawable.prototype.getEnabledEffects = function () {
/**
* Load a bitmap skin. Supports the same formats as the Image element.
* @param {string} skin_md5ext The MD5 and file extension of the bitmap skin.
* @param {number=} opt_costumeResolution Optionally, a resolution for the skin.
* @private
*/
Drawable.prototype._setSkinBitmap = function (skin_md5ext) {
Drawable.prototype._setSkinBitmap = function (skin_md5ext,
opt_costumeResolution) {
var url = skin_md5ext;
this._setSkinCore(url, 2);
this._setSkinCore(url, opt_costumeResolution);
};
/**
@ -311,7 +315,7 @@ Drawable.prototype.getVisible = function () {
Drawable.prototype.updateProperties = function (properties) {
var dirty = false;
if ('skin' in properties) {
this.setSkin(properties.skin);
this.setSkin(properties.skin, properties.costumeResolution);
this.setConvexHullDirty();
}
if ('position' in properties && (
@ -332,6 +336,13 @@ Drawable.prototype.updateProperties = function (properties) {
this._scale[1] = properties.scale[1];
dirty = true;
}
if ('rotationCenter' in properties && (
this._rotationCenter[0] != properties.rotationCenter[0] ||
this._rotationCenter[1] != properties.rotationCenter[1])) {
this._rotationCenter[0] = properties.rotationCenter[0];
this._rotationCenter[1] = properties.rotationCenter[1];
dirty = true;
}
if ('visible' in properties) {
this._visible = properties.visible;
this.setConvexHullDirty();
@ -401,6 +412,17 @@ Drawable.prototype._calculateTransform = function () {
var rotation = (270 - this._direction) * Math.PI / 180;
twgl.m4.rotateZ(modelMatrix, rotation, modelMatrix);
// Adjust rotation center relative to the skin.
var rotationAdjusted = twgl.v3.subtract(
this._rotationCenter,
twgl.v3.divScalar(this._uniforms.u_skinSize, 2)
);
rotationAdjusted[1] *= -1; // Y flipped to Scratch coordinate.
rotationAdjusted[2] = 0; // Z coordinate is 0.
twgl.m4.translate(modelMatrix, rotationAdjusted, modelMatrix);
var scaledSize = twgl.v3.divScalar(twgl.v3.multiply(
this._uniforms.u_skinSize, this._scale), 100);
scaledSize[2] = 0; // was NaN because the vectors have only 2 components.