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support (-360,360) angles for whalesong/image rotate

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This commit is contained in:
Stephen Chang 2015-06-03 14:53:44 -04:00
parent 5d5ab6b32a
commit 08ed474897
2 changed files with 16 additions and 2 deletions
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9
whalesong/image/private/js-impl.js
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@ -154,6 +154,9 @@ var checkPlaceY = plt.baselib.check.makeCheckArgumentType(
var checkAngle = plt.baselib.check.makeCheckArgumentType(
isAngle,
"finite real number between 0 and 360");
var checkRotateAngle = plt.baselib.check.makeCheckArgumentType(
isRotateAngle,
"finite real number between -360 and 360");
var checkMode = plt.baselib.check.makeCheckArgumentType(
@ -790,9 +793,13 @@ EXPORTS['rotate'] =
'rotate',
2,
function(MACHINE) {
var angle = checkAngle(MACHINE, "rotate", 0);
var angle = checkRotateAngle(MACHINE, "rotate", 0);
var img = checkImage(MACHINE, "rotate", 1);
if (jsnums.lessThan(angle, 0)) {
return makeRotateImage(jsnums.toFixnum(-(360 + angle)), img);
} else {
return makeRotateImage(jsnums.toFixnum(-angle), img);
}
});

7
whalesong/image/private/kernel.js
View File

@ -26,6 +26,12 @@ var isAngle = function(x) {
jsnums.greaterThanOrEqual(x, 0) &&
jsnums.lessThan(x, 360);
};
// differentiate between rotation angle and other angles
var isRotateAngle = function(x) {
return plt.baselib.numbers.isReal(x) &&
jsnums.greaterThan(x, -360) &&
jsnums.lessThan(x, 360);
};
// Produces true if the value is a color or a color string.
@ -1469,6 +1475,7 @@ EXPORTS.isImage = isImage;
EXPORTS.isScene = isScene;
EXPORTS.isColorOrColorString = isColorOrColorString;
EXPORTS.isAngle = isAngle;
EXPORTS.isRotateAngle = isRotateAngle;
EXPORTS.isSideCount = isSideCount;
EXPORTS.isStepCount = isStepCount;
EXPORTS.isPointsCount = isPointsCount;