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Allow overriding the candidates for picking

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This can be used to implement the "touching {mouse-pointer}?" block.
This commit is contained in:
Christopher Willis-Ford
2016-06-03 09:21:36 -07:00
parent eb7e87730c
commit 6b0f3379bf
1 changed files with 4 additions and 2 deletions
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6
src/RenderWebGL.js
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@@ -281,15 +281,17 @@ RenderWebGL.prototype._createQueryBuffers = function () {
* @param {int} centerY The client y coordinate of the picking location.
* @param {int} touchWidth The client width of the touch event (optional).
* @param {int} touchHeight The client height of the touch event (optional).
* @param {int[]} candidateIDs The Drawable IDs to pick from, otherwise all.
* @returns {int} The ID of the topmost Drawable under the picking location, or
* Drawable.NONE if there is no Drawable at that location.
*/
RenderWebGL.prototype.pick = function (
centerX, centerY, touchWidth, touchHeight) {
centerX, centerY, touchWidth, touchHeight, candidateIDs) {
var gl = this._gl;
touchWidth = touchWidth || 1;
touchHeight = touchHeight || 1;
candidateIDs = candidateIDs || this._drawables;
var clientToGLX = gl.canvas.width / gl.canvas.clientWidth;
var clientToGLY = gl.canvas.height / gl.canvas.clientHeight;
@@ -327,7 +329,7 @@ RenderWebGL.prototype.pick = function (
var projection = twgl.m4.ortho(
pickLeft, pickRight, pickTop, pickBottom, -1, 1);
this._drawThese(this._drawables, Drawable.DRAW_MODE.pick, projection);
this._drawThese(candidateIDs, Drawable.DRAW_MODE.pick, projection);
var pixels = new Buffer(touchWidth * touchHeight * 4);
gl.readPixels(