/* <copyright>
Copyright (c) 2012, Motorola Mobility LLC.
All Rights Reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
* Neither the name of Motorola Mobility LLC nor the names of its
contributors may be used to endorse or promote products derived from this
software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
</copyright> */
////////////////////////////////////////////////////////////////////////
//
var Montage = require("montage/core/core").Montage,
Component = require("montage/ui/component").Component;
////////////////////////////////////////////////////////////////////////
//
exports.ColorWheel = Montage.create(Component, {
////////////////////////////////////////////////////////////////////
//
hasTemplate: {
value: true
},
////////////////////////////////////////////////////////////////////
//Value of wheel in HSV (360, 100, 100)
_value: {
value: {h: 0, s: 0, v: 0}
},
////////////////////////////////////////////////////////////////////
//Value of wheel in HSV (360, 100, 100)
value: {
get: function() {
return this._value;
},
set: function(value) {
this._value = value;
if (this._wheelData) {
if (value && !value.wasSetByCode) {
this.wheelSelectorAngle(value.h/this._math.TAU*360);
this.drawSwatchColor(value.h/this._math.TAU*360);
this.drawSwatchSelector(value.s*100, value.v*100);
}
if (!this._isMouseDown) {
this._dispatchEvent('change', true);
}
}
}
},
////////////////////////////////////////////////////////////////////
//Stroke size of wheel
_strokeWidth: {
value: 2
},
////////////////////////////////////////////////////////////////////
//Size must be set in digits and interpreted as pixel
strokeWidth: {
get: function() {
return this._strokeWidth;
},
set: function(value) {
this._strokeWidth = value;
}
},
////////////////////////////////////////////////////////////////////
//Stroke color of wheel
_strokeColor: {
value: 'rgb(255, 255, 255)'
},
////////////////////////////////////////////////////////////////////
//Stroke only apply to wheel rim
strokeColor: {
get: function() {
return this._strokeColor;
},
set: function(value) {
this._strokeColor = value;
}
},
////////////////////////////////////////////////////////////////////
//Width of the rim
_rimWidth: {
value: 2
},
////////////////////////////////////////////////////////////////////
//Width must be set using digits interpreted as pixel
rimWidth: {
get: function() {
return this._rimWidth;
},
set: function(value) {
this._rimWidth = value;
}
},
////////////////////////////////////////////////////////////////////
//
_math: {
value: {PI: Math.PI, TAU: Math.PI*2, RADIANS: Math.PI/180}
},
////////////////////////////////////////////////////////////////////
//
prepareForDraw: {
value: function() {
//Hidding component while it is drawn
this.element.style.opacity = 0;
}
},
////////////////////////////////////////////////////////////////////
//
willDraw: {
value: function() {
//
}
},
////////////////////////////////////////////////////////////////////
//
draw: {
value: function() {
//
var slice, i, whlctx = this.wheel.getContext("2d");
//Determing radius by smallest factor of width or height
if (this.element.offsetWidth > this.element.offsetHeight) {
this._math.diameter = this.element.offsetWidth;
} else {
this._math.diameter = this.element.offsetHeight;
}
//Setting the radius from diameter
this._math.radius = this._math.diameter/2;
//Inner radius of wheel
this._math.innerRadius = this._math.radius - this.rimWidth;
//Setting the widths and heights to match the container's
this.wheel.width = this.wheel.height = this.wheelSelect.width = this.wheelSelect.height = this.swatchSelect.width = this.swatchSelect.height = this._math.diameter;
//
this._math.swatchLength = Math.floor((this._math.radius - this.rimWidth - this.strokeWidth*4) * Math.sin(45 * this._math.RADIANS) * 2);
this._math.swatchPosition = Math.round(this._math.radius - (this._math.swatchLength/2))+this.strokeWidth* Math.sin(45 * this._math.RADIANS);
//
this.swatch.style.top = this.swatch.style.left = this._math.swatchPosition+'px';
//Clearing wheel for redraw
whlctx.clearRect(0, 0, this._math.diameter, this._math.diameter);
////////////////////////////////////////////////////////////////
//Drawing color wheel circle
whlctx.save();
whlctx.beginPath();
whlctx.moveTo(0,0);
whlctx.lineTo(this._math.diameter,0);
whlctx.lineTo(this._math.diameter,this._math.diameter);
whlctx.lineTo(0,this._math.diameter);
whlctx.closePath();
whlctx.clip();
whlctx.strokeStyle = 'rgba(0,0,0,0)';
whlctx.lineCap = 'butt';
whlctx.lineJoin = 'miter';
whlctx.miterLimit = 4;
whlctx.save();
////////////////////////////////////////////////////////////////
//Looping through set intervals
this._math.radius = this._math.radius - this.strokeWidth/2;
for (i=0; i<60; i++) {
//Calculating slice number
slice = Math.round(255*i/60);
//Drawing 6 slices (6 colors in color theory)
this._drawWheelSlice (i, 255, slice, 0);
this._drawWheelSlice (i+60, 255-slice, 255, 0);
this._drawWheelSlice (i+120, 0, 255, slice);
this._drawWheelSlice (i+180, 0, 255-slice, 255);
this._drawWheelSlice (i+240, slice, 0, 255);
this._drawWheelSlice (i+300, 255, 0, 255-slice);
}
//
this._math.radius = this._math.radius + this.strokeWidth/2;
//TODO: Add parameter to allow for color specification of this inner 'empty' circle in wheel
whlctx.beginPath();
whlctx.arc(this._math.innerRadius+this.rimWidth, this._math.innerRadius+this.rimWidth, this._math.innerRadius-this.strokeWidth/2, 0, this._math.TAU, true);
whlctx.fillStyle = '#494949';
whlctx.fill();
whlctx.restore();
//
whlctx.strokeStyle = this.strokeColor;
whlctx.lineWidth = this.strokeWidth;
whlctx.globalAlpha = 1;
whlctx.beginPath();
whlctx.arc(this._math.radius, this._math.radius, this._math.radius-this.strokeWidth/2, 0, this._math.TAU, true);
whlctx.closePath();
whlctx.stroke();
whlctx.restore();
//
whlctx.strokeStyle = this.strokeColor;
whlctx.lineWidth = this.strokeWidth;
whlctx.globalAlpha = 1;
whlctx.beginPath();
whlctx.arc(this._math.innerRadius+this.rimWidth, this._math.innerRadius+this.rimWidth, this._math.innerRadius-this.strokeWidth/2, 0, this._math.TAU, true);
whlctx.closePath();
whlctx.stroke();
whlctx.restore();
//
whlctx.beginPath();
whlctx.moveTo(this._math.swatchPosition-this.strokeWidth/2, this._math.swatchPosition-this.strokeWidth/2);
whlctx.lineTo(this._math.swatchLength+this._math.swatchPosition-this.strokeWidth/2, this._math.swatchPosition-this.strokeWidth/2);
whlctx.lineTo(this._math.swatchLength+this._math.swatchPosition-this.strokeWidth/2, this._math.swatchLength+this._math.swatchPosition-this.strokeWidth/2);
whlctx.lineTo(this._math.swatchPosition-this.strokeWidth/2, this._math.swatchLength+this._math.swatchPosition-this.strokeWidth/2);
whlctx.closePath();
whlctx.strokeStyle = "rgba(0, 0, 0, .25)";
whlctx.shadowColor = "rgba(0, 0, 0, 1)";
whlctx.shadowBlur = 2;
whlctx.stroke();
//
this._wheelData = whlctx.getImageData(0, 0, this._math.diameter, this._math.diameter);
//TODO: Fix redraw bug
if(!this.value) {
this.wheelSelectorAngle(0);
this.drawSwatchColor(0);
this.drawSwatchSelector(100, 100);
} else {
this.wheelSelectorAngle(0);
this.drawSwatchColor(0);
this.drawSwatchSelector(100, 100);
//
this.wheelSelectorAngle(this.value.h/this._math.TAU*360);
this.drawSwatchColor(this.value.h/this._math.TAU*360);
this.drawSwatchSelector(this.value.s*100, this.value.v*100);
}
}
},
////////////////////////////////////////////////////////////////////
//
didDraw: {
value: function() {
//
this.element.style.opacity = 1;
//
this.wheelSelect.style.cursor = 'pointer';
//
this.wheelSelect.addEventListener('mouseup', this, false);
this.wheelSelect.addEventListener('mousedown', this, false);
this.wheelSelect.addEventListener('mousemove', this, false);
}
},
////////////////////////////////////////////////////////////////////
//
_scanningMode: {
value: null
},
////////////////////////////////////////////////////////////////////
//
_isMouseDown: {
value: false
},
////////////////////////////////////////////////////////////////////
//
handleMousedown: {
value: function(e) {
//
this._isMouseDown = true;
//
if ((e.offsetY < this._math.swatchPosition || e.offsetY > this._math.swatchLength+this._math.swatchPosition) || (e.offsetX < this._math.swatchPosition || e.offsetX > this._math.swatchLength+this._math.swatchPosition)) {
this._scanningMode = 'wheel';
} else {
this._scanningMode = 'swatch';
}
}
},
////////////////////////////////////////////////////////////////////
//
handleMouseup: {
value: function(e) {
var math = this._math;
//
if ((e.offsetY < math.swatchPosition || e.offsetY > math.swatchLength+math.swatchPosition) || (e.offsetX < math.swatchPosition || e.offsetX > math.swatchLength+math.swatchPosition)) {
if (this._scanningMode === 'wheel') {
this.mouseSetWheelAngle(e);
}
} else {
if (this._scanningMode === 'swatch'){
this.mouseSetSwatch(e);
}
}
this._dispatchEvent('change', false);
this._isMouseDown = false;
this._scanningMode = null;
}
},
////////////////////////////////////////////////////////////////////
//
handleMousemove: {
value: function(e) {
var math = this._math;
//
if (this._isMouseDown) {
if (this._scanningMode === 'wheel') {
this.mouseSetWheelAngle(e);
} else if (this._scanningMode === 'swatch'){
this.mouseSetSwatch(e);
}
//
this._dispatchEvent('changing', false);
} else {
if ((e.offsetY < math.swatchPosition || e.offsetY > math.swatchLength+math.swatchPosition) || (e.offsetX < math.swatchPosition || e.offsetX > math.swatchLength+math.swatchPosition)) {
this.wheelSelect.style.cursor = 'pointer';
} else {
this.wheelSelect.style.cursor = 'crosshair';
}
}
}
},
////////////////////////////////////////////////////////////////////
//
mouseSetWheelAngle: {
value: function(e) {
var angle = (2 * Math.atan2(e.offsetY - (this._math.radius - Math.sqrt(Math.pow(Math.abs(e.offsetX - this._math.radius),2) + Math.pow(Math.abs(e.offsetY - this._math.radius), 2))), e.offsetX - this._math.radius))/this._math.TAU*360;
if (this._value) {
this.value = {h: angle*this._math.TAU/360, s: this._value.s, v: this._value.v};
} else {
this.value = {h: angle*this._math.TAU/360, s: 1, v: 1};
}
this.wheelSelectorAngle(0);
this.wheelSelectorAngle(angle);
this.drawSwatchColor(angle);
}
},
////////////////////////////////////////////////////////////////////
//
mouseSetSwatch: {
value: function(e) {
//
var s, v, math = this._math;;
//
if (e.offsetX > math.swatchLength+math.swatchPosition) {
s = 100;
} else if (e.offsetX < math.swatchPosition) {
s = 0;
} else {
s = 100-100*(math.swatchLength-(e.offsetX-math.swatchPosition))/math.swatchLength;
}
//
if (e.offsetY > math.swatchLength+math.swatchPosition) {
v = 0;
} else if (e.offsetY < math.swatchPosition) {
v = 100;
} else {
v = 100-(e.offsetY-math.swatchPosition)/math.swatchLength*100;
}
//
if (this._value) {
this.value = {h: this._value.h, s: s/100, v: v/100};
} else {
this.value = {h: 0, s: s/100, v: v/100};
}
//
this.drawSwatchSelector(s, v);
}
},
////////////////////////////////////////////////////////////////////
//
_wheelData: {
value: null
},
////////////////////////////////////////////////////////////////////
//
_previousDegree: {
value: 0
},
////////////////////////////////////////////////////////////////////
//
drawSwatchSelector: {
value: function (s, v) {
var context = this.swatchSelect.getContext("2d"), strokeWidth = this.strokeWidth/2, radius = this._math.radius/28, math = this._math;
context.clearRect(0, 0, math.diameter, math.diameter);
//White outline
context.beginPath();
context.strokeStyle = '#FFF';
context.lineWidth = strokeWidth;
context.globalAlpha = 1;
//context.arc(this._math.swatchPosition+(this._math.swatchLength*(s/100)) - radius/2, this._math.swatchPosition+(this._math.swatchLength*(1-v/100))- radius/2, radius-strokeWidth, 0, this._math.TAU, true);
context.arc(math.swatchPosition+(math.swatchLength*(s/100)), math.swatchPosition+(math.swatchLength*(1-v/100)), radius-strokeWidth, 0, math.TAU, true);
context.closePath();
context.stroke();
context.restore();
//Black outline
context.beginPath();
context.strokeStyle = '#000';
context.lineWidth = strokeWidth;
context.globalAlpha = 1;
context.arc(math.swatchPosition+(math.swatchLength*(s/100)), math.swatchPosition+(math.swatchLength*(1-v/100)), radius, 0, math.TAU, true);
context.closePath();
context.stroke();
context.restore();
}
},
////////////////////////////////////////////////////////////////////
//
drawSwatchColor: {
value: function (angle) {
var context = this.swatch.getContext("2d"), gradient, math = this._math;
context.clearRect(0, 0, math.swatchLength, math.swatchLength);
context.beginPath();
context.moveTo(0, 0);
context.lineTo(math.swatchLength, 0);
context.lineTo(math.swatchLength, math.swatchLength);
context.lineTo(0, math.swatchLength);
context.closePath();
context.fillStyle = 'hsl('+angle+', 100%, 50%)';
context.fill();
//
context.beginPath();
context.moveTo(0, 0);
context.lineTo(math.swatchLength, 0);
context.lineTo(math.swatchLength, math.swatchLength);
context.lineTo(0, math.swatchLength);
gradient = context.createLinearGradient(0,0,math.swatchLength,0);
gradient.addColorStop(0,"rgba(255, 255, 255, 255)");
gradient.addColorStop(1,"rgba(255, 255, 255, 0)");
context.fillStyle = gradient;
context.fillRect(0 , 0, math.swatchLength, math.swatchLength);
context.closePath();
//
context.beginPath();
context.moveTo(0, math.swatchLength);
context.lineTo(math.swatchLength, 0);
context.lineTo(math.swatchLength, math.swatchLength);
context.lineTo(0, math.swatchLength);
gradient = context.createLinearGradient(0,math.swatchLength,0, 0);
gradient.addColorStop(0,"rgba(0, 0, 0, 255)");
gradient.addColorStop(1,"rgba(0, 0, 0, 0)");
context.fillStyle = gradient;
context.fillRect(0 , 0, math.swatchLength, math.swatchLength);
context.closePath();
}
},
////////////////////////////////////////////////////////////////////
//
_drawWheelSlice: {
value: function (s, r, g, b) {
//
var context = this.wheel.getContext("2d"),
radius = this._math.radius,
trnslt = radius + this.strokeWidth/2;
//
context.beginPath();
context.fillStyle = 'rgb('+r+','+g+','+b+')';
context.scale(1,1);
context.translate(trnslt, trnslt);
context.rotate(s*this._math.RADIANS);
context.translate(-radius, -radius);
context.moveTo(radius, radius);
context.translate(radius, radius);
context.arc(0, 0, radius, -1.59, -1.53, 0);
context.translate(-radius, -radius);
context.lineTo(radius, this.rimWidth);
context.translate(radius, radius);
context.arc(0, 0, this._math.innerRadius, -1.53, -1.59, 1);
context.closePath();
context.fill();
context.stroke();
context.restore();
context.save();
}
},
////////////////////////////////////////////////////////////////////
//
wheelSelectorAngle: {
value: function (angle) {
angle *= this._math.RADIANS;
//
var context = this.wheelSelect.getContext("2d"), radius = this._math.radius,
radiusOffsetPositive = this._math.radius+this.rimWidth/3,
rimPositiveStrokeOffset = this.rimWidth + this.strokeWidth,
strokeTotalWidth = this.strokeWidth*2,
rimNegativeStrokeOffset = this.rimWidth - this.strokeWidth,
radiusOffsetNagative = this._math.radius-this.rimWidth/3;
//
context.clearRect(0, 0, this.wheelSelect.width, this.wheelSelect.height);
//
context.beginPath();
context.fillStyle = "rgba(0, 0, 0, 0)";
context.shadowColor = "rgba(0 , 0, 0, 1)";
context.shadowBlur = this.strokeWidth;
context.strokeStyle = this.strokeColor;
context.lineWidth = this.strokeWidth;
context.translate(radius, radius);
context.rotate(angle - this._previousDegree);
this._previousDegree = angle;
context.translate(-radius, -radius);
context.globalAlpha = 1;
context.moveTo(radius, 0);
context.lineTo(radius, 0);
context.quadraticCurveTo(radiusOffsetPositive, 0, radiusOffsetPositive, strokeTotalWidth);
context.lineTo(radiusOffsetPositive, rimNegativeStrokeOffset);
context.quadraticCurveTo(radiusOffsetPositive, rimPositiveStrokeOffset, radius, rimPositiveStrokeOffset);
context.lineTo(radius, rimPositiveStrokeOffset);
context.quadraticCurveTo(radiusOffsetNagative, rimPositiveStrokeOffset, radiusOffsetNagative,rimNegativeStrokeOffset);
context.lineTo(radiusOffsetNagative, strokeTotalWidth);
context.quadraticCurveTo(radiusOffsetNagative, 0, radius, 0);
context.stroke();
context.closePath();
}
},
////////////////////////////////////////////////////////////////////
//Dispatching custom event
_dispatchEvent: {
value: function(type, userInitiated) {
var actionEvent = document.createEvent("CustomEvent");
actionEvent.initEvent(type, true, true);
actionEvent.type = type;
actionEvent.wasSetByCode = userInitiated;
actionEvent.hsv = this.value;
this.dispatchEvent(actionEvent);
}
}
////////////////////////////////////////////////////////////////////
});