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Limit joystick movement range to a circle #46

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Limit joystick movement range to a circle #46

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19 changes: 14 additions & 5 deletions joy.js
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Original file line number Diff line number Diff line change
Expand Up @@ -81,7 +81,8 @@ var JoyStick = (function(container, parameters, callback)
internalStrokeColor = (typeof parameters.internalStrokeColor === "undefined" ? "#003300" : parameters.internalStrokeColor),
externalLineWidth = (typeof parameters.externalLineWidth === "undefined" ? 2 : parameters.externalLineWidth),
externalStrokeColor = (typeof parameters.externalStrokeColor === "undefined" ? "#008000" : parameters.externalStrokeColor),
autoReturnToCenter = (typeof parameters.autoReturnToCenter === "undefined" ? true : parameters.autoReturnToCenter);
autoReturnToCenter = (typeof parameters.autoReturnToCenter === "undefined" ? true : parameters.autoReturnToCenter),
limitToCircle = (typeof parameters.limitToCircle === "undefined" ? false : parameters.limitToCircle);

callback = callback || function(StickStatus) {};

Expand Down Expand Up @@ -154,10 +155,18 @@ var JoyStick = (function(container, parameters, callback)
function drawInternal()
{
context.beginPath();
if(movedX<internalRadius) { movedX=maxMoveStick; }
if((movedX+internalRadius) > canvas.width) { movedX = canvas.width-(maxMoveStick); }
if(movedY<internalRadius) { movedY=maxMoveStick; }
if((movedY+internalRadius) > canvas.height) { movedY = canvas.height-(maxMoveStick); }
if (limitToCircle) {
var scalingFactor = Math.sqrt(Math.pow(internalRadius, 2) / (Math.pow(movedX - centerX, 2) + Math.pow(movedY - centerY, 2)));
if (scalingFactor < 1) {
movedX = centerX + (movedX - centerX) * scalingFactor;
movedY = centerY + (movedY - centerY) * scalingFactor;
}
} else {
if(movedX<internalRadius) { movedX=maxMoveStick; }
if((movedX+internalRadius) > canvas.width) { movedX = canvas.width-(maxMoveStick); }
if(movedY<internalRadius) { movedY=maxMoveStick; }
if((movedY+internalRadius) > canvas.height) { movedY = canvas.height-(maxMoveStick); }
}
context.arc(movedX, movedY, internalRadius, 0, circumference, false);
// create radial gradient
var grd = context.createRadialGradient(centerX, centerY, 5, centerX, centerY, 200);
Expand Down