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Picking improvements

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- Increased canvas border in demo.html to make it more obvious if future
  code forgets to compensate for the border.
- Fixed picking code to compensate for a border around the canvas.
- Completed support for picking with a touch larger than a single point.
This commit is contained in:
Christopher Willis-Ford 2016-05-31 14:00:39 -07:00
parent c02d2a1f5b
commit f6b78b2216
3 changed files with 120 additions and 28 deletions

13
src/Drawable.js
View file

@ -442,13 +442,16 @@ Drawable.color4fFromID = function(id) {
* Calculate the ID number represented by the given color. If all components of
* the color are zero, the result will be Drawable.NONE; otherwise the result
* will be a valid ID.
* @param {Array.<int>} rgba An array of [r,g,b,a], each component a byte.
* @param {int} r The red value of the color, in the range [0,255].
* @param {int} g The green value of the color, in the range [0,255].
* @param {int} b The blue value of the color, in the range [0,255].
* @param {int} a The alpha value of the color, in the range [0,255].
* @returns {int} The ID represented by that color.
*/
Drawable.color4ubToID = function(rgba) {
Drawable.color4ubToID = function(r, g, b, a) {
var id;
id = (rgba[0] & 255) << 0;
id |= (rgba[1] & 255) << 8;
id |= (rgba[2] & 255) << 16;
id = (r & 255) << 0;
id |= (g & 255) << 8;
id |= (b & 255) << 16;
return id + Drawable.NONE;
};