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turtlestitch/symbols.js

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JavaScript
Czysty Wina Historia

/*
symbols.js
graphical GUI-symbols for for morphic.js and Snap!
written by Jens Mönig
jens@moenig.org
Copyright (C) 2017 by Jens Mönig
This file is part of Snap!.
Snap! is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of
the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
prerequisites:
--------------
needs morphic.js
prerequisites:
--------------
additional symbols have been contributed by members of the Snap!
open-source community, especially by Bernat Romagosa
*/
/*global modules, Morph, Point, newCanvas, Costume, radians, Color*/
// Global stuff ////////////////////////////////////////////////////////
modules.symbols = '2017-September-01';
var SymbolMorph;
/*
WorldMorph.prototype.customMorphs = function () {
// add examples to the world's demo menu
return [
new SymbolMorph(
'notes',
50,
new Color(250, 250, 250),
new Point(-1, -1),
new Color(20, 20, 20)
)
];
};
*/
// SymbolMorph //////////////////////////////////////////////////////////
/*
I display graphical symbols, such as special letters. I have been
called into existence out of frustration about not being able to
consistently use Unicode characters to the same ends.
Symbols can also display costumes, if one is specified in lieu
of a name property, although this feature is currently not being
used because of asynchronous image loading issues.
*/
// SymbolMorph inherits from Morph:
SymbolMorph.prototype = new Morph();
SymbolMorph.prototype.constructor = SymbolMorph;
SymbolMorph.uber = Morph.prototype;
// SymbolMorph available symbols:
SymbolMorph.prototype.names = [
'square',
'pointRight',
'stepForward',
'gears',
'file',
'fullScreen',
'normalScreen',
'smallStage',
'normalStage',
'turtle',
'stage',
'turtleOutline',
'pause',
'flag',
'octagon',
'cloud',
'cloudOutline',
'cloudGradient',
'turnRight',
'turnLeft',
'storage',
'poster',
'flash',
'brush',
'rectangle',
'rectangleSolid',
'circle',
'circleSolid',
'line',
'crosshairs',
'paintbucket',
'eraser',
'pipette',
'speechBubble',
'speechBubbleOutline',
'turnBack',
'turnForward',
'arrowUp',
'arrowUpOutline',
'arrowLeft',
'arrowLeftOutline',
'arrowDown',
'arrowDownOutline',
'arrowRight',
'arrowRightOutline',
'robot',
'magnifyingGlass',
'notes'
];
// SymbolMorph instance creation:
function SymbolMorph(name, size, color, shadowOffset, shadowColor) {
this.init(name, size, color, shadowOffset, shadowColor);
}
SymbolMorph.prototype.init = function (
name, // or costume
size,
color,
shadowOffset,
shadowColor
) {
this.isProtectedLabel = false; // participate in zebraing
this.isReadOnly = true;
this.name = name || 'square'; // can also be a costume
this.size = size || ((size === 0) ? 0 : 50);
this.shadowOffset = shadowOffset || new Point(0, 0);
this.shadowColor = shadowColor || null;
SymbolMorph.uber.init.call(this, true); // silently
this.color = color || new Color(0, 0, 0);
this.drawNew();
};
// SymbolMorph zebra coloring:
SymbolMorph.prototype.setLabelColor = function (
textColor,
shadowColor,
shadowOffset
) {
this.shadowOffset = shadowOffset || new Point();
this.shadowColor = shadowColor;
this.setColor(textColor);
};
// SymbolMorph displaying:
SymbolMorph.prototype.drawNew = function () {
var ctx, x, y, sx, sy;
this.image = newCanvas(new Point(
this.symbolWidth() + Math.abs(this.shadowOffset.x),
this.size + Math.abs(this.shadowOffset.y)
));
this.silentSetWidth(this.image.width);
this.silentSetHeight(this.image.height);
ctx = this.image.getContext('2d');
sx = this.shadowOffset.x < 0 ? 0 : this.shadowOffset.x;
sy = this.shadowOffset.y < 0 ? 0 : this.shadowOffset.y;
x = this.shadowOffset.x < 0 ? Math.abs(this.shadowOffset.x) : 0;
y = this.shadowOffset.y < 0 ? Math.abs(this.shadowOffset.y) : 0;
if (this.shadowColor) {
ctx.drawImage(
this.symbolCanvasColored(this.shadowColor),
sx,
sy
);
}
ctx.drawImage(
this.symbolCanvasColored(this.color),
x,
y
);
};
SymbolMorph.prototype.symbolCanvasColored = function (aColor) {
// private
if (this.name instanceof Costume) {
return this.name.thumbnail(new Point(this.symbolWidth(), this.size));
}
var canvas = newCanvas(new Point(this.symbolWidth(), this.size));
switch (this.name) {
case 'square':
return this.drawSymbolStop(canvas, aColor);
case 'pointRight':
return this.drawSymbolPointRight(canvas, aColor);
case 'stepForward':
return this.drawSymbolStepForward(canvas, aColor);
case 'gears':
return this.drawSymbolGears(canvas, aColor);
case 'file':
return this.drawSymbolFile(canvas, aColor);
case 'fullScreen':
return this.drawSymbolFullScreen(canvas, aColor);
case 'normalScreen':
return this.drawSymbolNormalScreen(canvas, aColor);
case 'smallStage':
return this.drawSymbolSmallStage(canvas, aColor);
case 'normalStage':
return this.drawSymbolNormalStage(canvas, aColor);
case 'turtle':
return this.drawSymbolTurtle(canvas, aColor);
case 'stage':
return this.drawSymbolStop(canvas, aColor);
case 'turtleOutline':
return this.drawSymbolTurtleOutline(canvas, aColor);
case 'pause':
return this.drawSymbolPause(canvas, aColor);
case 'flag':
return this.drawSymbolFlag(canvas, aColor);
case 'octagon':
return this.drawSymbolOctagon(canvas, aColor);
case 'cloud':
return this.drawSymbolCloud(canvas, aColor);
case 'cloudOutline':
return this.drawSymbolCloudOutline(canvas, aColor);
case 'cloudGradient':
return this.drawSymbolCloudGradient(canvas, aColor);
case 'turnRight':
return this.drawSymbolTurnRight(canvas, aColor);
case 'turnLeft':
return this.drawSymbolTurnLeft(canvas, aColor);
case 'storage':
return this.drawSymbolStorage(canvas, aColor);
case 'poster':
return this.drawSymbolPoster(canvas, aColor);
case 'flash':
return this.drawSymbolFlash(canvas, aColor);
case 'brush':
return this.drawSymbolBrush(canvas, aColor);
case 'rectangle':
return this.drawSymbolRectangle(canvas, aColor);
case 'rectangleSolid':
return this.drawSymbolRectangleSolid(canvas, aColor);
case 'circle':
return this.drawSymbolCircle(canvas, aColor);
case 'circleSolid':
return this.drawSymbolCircleSolid(canvas, aColor);
case 'line':
return this.drawSymbolLine(canvas, aColor);
case 'crosshairs':
return this.drawSymbolCrosshairs(canvas, aColor);
case 'paintbucket':
return this.drawSymbolPaintbucket(canvas, aColor);
case 'eraser':
return this.drawSymbolEraser(canvas, aColor);
case 'pipette':
return this.drawSymbolPipette(canvas, aColor);
case 'speechBubble':
return this.drawSymbolSpeechBubble(canvas, aColor);
case 'speechBubbleOutline':
return this.drawSymbolSpeechBubbleOutline(canvas, aColor);
case 'turnBack':
return this.drawSymbolTurnBack(canvas, aColor);
case 'turnForward':
return this.drawSymbolTurnForward(canvas, aColor);
case 'arrowUp':
return this.drawSymbolArrowUp(canvas, aColor);
case 'arrowUpOutline':
return this.drawSymbolArrowUpOutline(canvas, aColor);
case 'arrowLeft':
return this.drawSymbolArrowLeft(canvas, aColor);
case 'arrowLeftOutline':
return this.drawSymbolArrowLeftOutline(canvas, aColor);
case 'arrowDown':
return this.drawSymbolArrowDown(canvas, aColor);
case 'arrowDownOutline':
return this.drawSymbolArrowDownOutline(canvas, aColor);
case 'arrowRight':
return this.drawSymbolArrowRight(canvas, aColor);
case 'arrowRightOutline':
return this.drawSymbolArrowRightOutline(canvas, aColor);
case 'robot':
return this.drawSymbolRobot(canvas, aColor);
case 'magnifyingGlass':
return this.drawSymbolMagnifyingGlass(canvas, aColor);
case 'notes':
return this.drawSymbolNotes(canvas, aColor);
default:
return canvas;
}
};
SymbolMorph.prototype.symbolWidth = function () {
// private
var size = this.size;
if (this.name instanceof Costume) {
return (size / this.name.height()) * this.name.width();
}
switch (this.name) {
case 'pointRight':
return Math.sqrt(size * size - Math.pow(size / 2, 2));
case 'flash':
case 'file':
return size * 0.8;
case 'smallStage':
case 'normalStage':
return size * 1.2;
case 'turtle':
case 'turtleOutline':
case 'stage':
return size * 1.3;
case 'cloud':
case 'cloudGradient':
case 'cloudOutline':
case 'turnBack':
case 'turnForward':
return size * 1.6;
case 'turnRight':
case 'turnLeft':
return size / 3 * 2;
default:
return size;
}
};
SymbolMorph.prototype.drawSymbolStop = function (canvas, color) {
// answer a canvas showing a vertically centered square
var ctx = canvas.getContext('2d');
ctx.fillStyle = color.toString();
ctx.fillRect(0, 0, canvas.width, canvas.height);
return canvas;
};
SymbolMorph.prototype.drawSymbolPointRight = function (canvas, color) {
// answer a canvas showing a right-pointing, equilateral triangle
var ctx = canvas.getContext('2d');
ctx.fillStyle = color.toString();
ctx.beginPath();
ctx.moveTo(0, 0);
ctx.lineTo(canvas.width, Math.round(canvas.height / 2));
ctx.lineTo(0, canvas.height);
ctx.lineTo(0, 0);
ctx.closePath();
ctx.fill();
return canvas;
};
SymbolMorph.prototype.drawSymbolStepForward = function (canvas, color) {
// answer a canvas showing a right-pointing triangle
// followed by a vertical bar
var ctx = canvas.getContext('2d');
ctx.fillStyle = color.toString();
ctx.beginPath();
ctx.moveTo(0, 0);
ctx.lineTo(canvas.width * 0.75, Math.round(canvas.height / 2));
ctx.lineTo(0, canvas.height);
ctx.lineTo(0, 0);
ctx.closePath();
ctx.fill();
ctx.fillRect(
canvas.width * 0.75,
0,
canvas.width * 0.25,
canvas.height
);
return canvas;
};
SymbolMorph.prototype.drawSymbolGears = function (canvas, color) {
// answer a canvas showing gears
var ctx = canvas.getContext('2d'),
w = canvas.width,
r = w / 2,
e = w / 6;
ctx.strokeStyle = color.toString();
ctx.lineWidth = canvas.width / 7;
ctx.beginPath();
ctx.arc(r, r, w, radians(0), radians(360), true);
ctx.arc(r, r, e * 1.5, radians(0), radians(360), false);
ctx.closePath();
ctx.clip();
ctx.moveTo(0, r);
ctx.lineTo(w, r);
ctx.stroke();
ctx.moveTo(r, 0);
ctx.lineTo(r, w);
ctx.stroke();
ctx.moveTo(e, e);
ctx.lineTo(w - e, w - e);
ctx.stroke();
ctx.moveTo(w - e, e);
ctx.lineTo(e, w - e);
ctx.stroke();
return canvas;
};
SymbolMorph.prototype.drawSymbolFile = function (canvas, color) {
// answer a canvas showing a page symbol
var ctx = canvas.getContext('2d'),
w = Math.min(canvas.width, canvas.height) / 2;
ctx.fillStyle = color.toString();
ctx.beginPath();
ctx.moveTo(0, 0);
ctx.lineTo(w, 0);
ctx.lineTo(w, w);
ctx.lineTo(canvas.width, w);
ctx.lineTo(canvas.width, canvas.height);
ctx.lineTo(0, canvas.height);
ctx.closePath();
ctx.fill();
ctx.fillStyle = color.darker(25).toString();
ctx.beginPath();
ctx.moveTo(w, 0);
ctx.lineTo(canvas.width, w);
ctx.lineTo(w, w);
ctx.lineTo(w, 0);
ctx.closePath();
ctx.fill();
return canvas;
};
SymbolMorph.prototype.drawSymbolFullScreen = function (canvas, color) {
// answer a canvas showing two arrows pointing diagonally outwards
var ctx = canvas.getContext('2d'),
h = canvas.height,
c = canvas.width / 2,
off = canvas.width / 20,
w = canvas.width / 2;
ctx.strokeStyle = color.toString();
ctx.lineWidth = canvas.width / 5;
ctx.moveTo(c - off, c + off);
ctx.lineTo(0, h);
ctx.stroke();
ctx.strokeStyle = color.toString();
ctx.lineWidth = canvas.width / 5;
ctx.moveTo(c + off, c - off);
ctx.lineTo(h, 0);
ctx.stroke();
ctx.fillStyle = color.toString();
ctx.beginPath();
ctx.moveTo(0, h);
ctx.lineTo(0, h - w);
ctx.lineTo(w, h);
ctx.closePath();
ctx.fill();
ctx.fillStyle = color.toString();
ctx.beginPath();
ctx.moveTo(h, 0);
ctx.lineTo(h - w, 0);
ctx.lineTo(h, w);
ctx.closePath();
ctx.fill();
return canvas;
};
SymbolMorph.prototype.drawSymbolNormalScreen = function (canvas, color) {
// answer a canvas showing two arrows pointing diagonally inwards
var ctx = canvas.getContext('2d'),
h = canvas.height,
c = canvas.width / 2,
off = canvas.width / 20,
w = canvas.width;
ctx.strokeStyle = color.toString();
ctx.lineWidth = canvas.width / 5;
ctx.moveTo(c - off * 3, c + off * 3);
ctx.lineTo(0, h);
ctx.stroke();
ctx.strokeStyle = color.toString();
ctx.lineWidth = canvas.width / 5;
ctx.moveTo(c + off * 3, c - off * 3);
ctx.lineTo(h, 0);
ctx.stroke();
ctx.fillStyle = color.toString();
ctx.beginPath();
ctx.moveTo(c + off, c - off);
ctx.lineTo(w, c - off);
ctx.lineTo(c + off, 0);
ctx.closePath();
ctx.fill();
ctx.fillStyle = color.toString();
ctx.beginPath();
ctx.moveTo(c - off, c + off);
ctx.lineTo(0, c + off);
ctx.lineTo(c - off, w);
ctx.closePath();
ctx.fill();
return canvas;
};
SymbolMorph.prototype.drawSymbolSmallStage = function (canvas, color) {
// answer a canvas showing a stage toggling symbol
var ctx = canvas.getContext('2d'),
w = canvas.width,
h = canvas.height,
w2 = w / 2,
h2 = h / 2;
ctx.fillStyle = color.darker(40).toString();
ctx.fillRect(0, 0, w, h);
ctx.fillStyle = color.toString();
ctx.fillRect(w2, 0, w2, h2);
return canvas;
};
SymbolMorph.prototype.drawSymbolNormalStage = function (canvas, color) {
// answer a canvas showing a stage toggling symbol
var ctx = canvas.getContext('2d'),
w = canvas.width,
h = canvas.height,
w2 = w / 2,
h2 = h / 2;
ctx.fillStyle = color.toString();
ctx.fillRect(0, 0, w, h);
ctx.fillStyle = color.darker(25).toString();
ctx.fillRect(w2, 0, w2, h2);
return canvas;
};
SymbolMorph.prototype.drawSymbolTurtle = function (canvas, color) {
// answer a canvas showing a turtle
var ctx = canvas.getContext('2d');
ctx.fillStyle = color.toString();
ctx.beginPath();
ctx.moveTo(0, 0);
ctx.lineTo(canvas.width, canvas.height / 2);
ctx.lineTo(0, canvas.height);
ctx.lineTo(canvas.height / 2, canvas.height / 2);
ctx.closePath();
ctx.fill();
return canvas;
};
SymbolMorph.prototype.drawSymbolTurtleOutline = function (canvas, color) {
// answer a canvas showing a turtle
var ctx = canvas.getContext('2d');
ctx.strokeStyle = color.toString();
ctx.beginPath();
ctx.moveTo(0, 0);
ctx.lineTo(canvas.width, canvas.height / 2);
ctx.lineTo(0, canvas.height);
ctx.lineTo(canvas.height / 2, canvas.height / 2);
ctx.closePath();
ctx.stroke();
return canvas;
};
SymbolMorph.prototype.drawSymbolPause = function (canvas, color) {
// answer a canvas showing two parallel rectangles
var ctx = canvas.getContext('2d'),
w = canvas.width / 5;
ctx.fillStyle = color.toString();
ctx.fillRect(0, 0, w * 2, canvas.height);
ctx.fillRect(w * 3, 0, w * 2, canvas.height);
return canvas;
};
SymbolMorph.prototype.drawSymbolFlag = function (canvas, color) {
// answer a canvas showing a flag
var ctx = canvas.getContext('2d'),
w = canvas.width,
l = Math.max(w / 12, 1),
h = canvas.height;
ctx.lineWidth = l;
ctx.strokeStyle = color.toString();
ctx.beginPath();
ctx.moveTo(l / 2, 0);
ctx.lineTo(l / 2, canvas.height);
ctx.stroke();
ctx.lineWidth = h / 2;
ctx.beginPath();
ctx.moveTo(0, h / 4);
ctx.bezierCurveTo(
w * 0.8,
h / 4,
w * 0.1,
h * 0.5,
w,
h * 0.5
);
ctx.stroke();
return canvas;
};
SymbolMorph.prototype.drawSymbolOctagon = function (canvas, color) {
// answer a canvas showing an octagon
var ctx = canvas.getContext('2d'),
side = canvas.width,
vert = (side - (side * 0.383)) / 2;
ctx.fillStyle = color.toString();
ctx.beginPath();
ctx.moveTo(vert, 0);
ctx.lineTo(side - vert, 0);
ctx.lineTo(side, vert);
ctx.lineTo(side, side - vert);
ctx.lineTo(side - vert, side);
ctx.lineTo(vert, side);
ctx.lineTo(0, side - vert);
ctx.lineTo(0, vert);
ctx.closePath();
ctx.fill();
return canvas;
};
SymbolMorph.prototype.drawSymbolCloud = function (canvas, color) {
// answer a canvas showing an cloud
var ctx = canvas.getContext('2d'),
w = canvas.width,
h = canvas.height,
r1 = h * 2 / 5,
r2 = h / 4,
r3 = h * 3 / 10,
r4 = h / 5;
ctx.fillStyle = color.toString();
ctx.beginPath();
ctx.arc(r2, h - r2, r2, radians(90), radians(259), false);
ctx.arc(w / 20 * 5, h / 9 * 4, r4, radians(165), radians(300), false);
ctx.arc(w / 20 * 11, r1, r1, radians(200), radians(357), false);
ctx.arc(w - r3, h - r3, r3, radians(269), radians(90), false);
ctx.closePath();
ctx.fill();
return canvas;
};
SymbolMorph.prototype.drawSymbolCloudGradient = function (canvas, color) {
// answer a canvas showing an cloud
var ctx = canvas.getContext('2d'),
gradient,
w = canvas.width,
h = canvas.height,
r1 = h * 2 / 5,
r2 = h / 4,
r3 = h * 3 / 10,
r4 = h / 5;
gradient = ctx.createRadialGradient(
0,
0,
0,
0,
0,
w
);
gradient.addColorStop(0, color.lighter(25).toString());
gradient.addColorStop(1, color.darker(25).toString());
ctx.fillStyle = gradient;
ctx.beginPath();
ctx.arc(r2, h - r2, r2, radians(90), radians(259), false);
ctx.arc(w / 20 * 5, h / 9 * 4, r4, radians(165), radians(300), false);
ctx.arc(w / 20 * 11, r1, r1, radians(200), radians(357), false);
ctx.arc(w - r3, h - r3, r3, radians(269), radians(90), false);
ctx.closePath();
ctx.fill();
return canvas;
};
SymbolMorph.prototype.drawSymbolCloudOutline = function (canvas, color) {
// answer a canvas showing an cloud
var ctx = canvas.getContext('2d'),
w = canvas.width,
h = canvas.height,
r1 = h * 2 / 5,
r2 = h / 4,
r3 = h * 3 / 10,
r4 = h / 5;
ctx.strokeStyle = color.toString();
ctx.beginPath();
ctx.arc(r2 + 1, h - r2 - 1, r2, radians(90), radians(259), false);
ctx.arc(w / 20 * 5, h / 9 * 4, r4, radians(165), radians(300), false);
ctx.arc(w / 20 * 11, r1 + 1, r1, radians(200), radians(357), false);
ctx.arc(w - r3 - 1, h - r3 - 1, r3, radians(269), radians(90), false);
ctx.closePath();
ctx.stroke();
return canvas;
};
SymbolMorph.prototype.drawSymbolTurnRight = function (canvas, color) {
// answer a canvas showing a right-turning arrow
var ctx = canvas.getContext('2d'),
w = canvas.width,
l = Math.max(w / 10, 1),
r = w / 2;
ctx.lineWidth = l;
ctx.strokeStyle = color.toString();
ctx.beginPath();
ctx.arc(r, r * 2, r - l / 2, radians(0), radians(-90), false);
ctx.stroke();
ctx.fillStyle = color.toString();
ctx.beginPath();
ctx.moveTo(w, r);
ctx.lineTo(r, 0);
ctx.lineTo(r, r * 2);
ctx.closePath();
ctx.fill();
return canvas;
};
SymbolMorph.prototype.drawSymbolTurnLeft = function (canvas, color) {
// answer a canvas showing a left-turning arrow
var ctx = canvas.getContext('2d'),
w = canvas.width,
l = Math.max(w / 10, 1),
r = w / 2;
ctx.lineWidth = l;
ctx.strokeStyle = color.toString();
ctx.beginPath();
ctx.arc(r, r * 2, r - l / 2, radians(180), radians(-90), true);
ctx.stroke();
ctx.fillStyle = color.toString();
ctx.beginPath();
ctx.moveTo(0, r);
ctx.lineTo(r, 0);
ctx.lineTo(r, r * 2);
ctx.closePath();
ctx.fill();
return canvas;
};
SymbolMorph.prototype.drawSymbolStorage = function (canvas, color) {
// answer a canvas showing a stack of three disks
var ctx = canvas.getContext('2d'),
w = canvas.width,
h = canvas.height,
r = canvas.height,
unit = canvas.height / 11;
function drawDisk(bottom, fillTop) {
ctx.fillStyle = color.toString();
ctx.beginPath();
ctx.arc(w / 2, bottom - h, r, radians(60), radians(120), false);
ctx.lineTo(0, bottom - unit * 2);
ctx.arc(
w / 2,
bottom - h - unit * 2,
r,
radians(120),
radians(60),
true
);
ctx.closePath();
ctx.fill();
ctx.fillStyle = color.darker(25).toString();
ctx.beginPath();
if (fillTop) {
ctx.arc(
w / 2,
bottom - h - unit * 2,
r,
radians(120),
radians(60),
true
);
}
ctx.arc(
w / 2,
bottom + unit * 6 + 1,
r,
radians(60),
radians(120),
true
);
ctx.closePath();
if (fillTop) {
ctx.fill();
} else {
ctx.stroke();
}
}
ctx.strokeStyle = color.toString();
drawDisk(h);
drawDisk(h - unit * 3);
drawDisk(h - unit * 6, false);
return canvas;
};
SymbolMorph.prototype.drawSymbolPoster = function (canvas, color) {
// answer a canvas showing a poster stand
var ctx = canvas.getContext('2d'),
w = canvas.width,
h = canvas.height,
bottom = h * 0.75,
edge = canvas.height / 5;
ctx.fillStyle = color.toString();
ctx.strokeStyle = color.toString();
ctx.lineWidth = w / 15;
ctx.moveTo(w / 2, h / 3);
ctx.lineTo(w / 6, h);
ctx.stroke();
ctx.moveTo(w / 2, h / 3);
ctx.lineTo(w / 2, h);
ctx.stroke();
ctx.moveTo(w / 2, h / 3);
ctx.lineTo(w * 5 / 6, h);
ctx.stroke();
ctx.fillRect(0, 0, w, bottom);
ctx.clearRect(0, bottom, w, w / 20);
ctx.clearRect(w - edge, bottom - edge, edge + 1, edge + 1);
ctx.fillStyle = color.darker(25).toString();
ctx.beginPath();
ctx.moveTo(w, bottom - edge);
ctx.lineTo(w - edge, bottom - edge);
ctx.lineTo(w - edge, bottom);
ctx.closePath();
ctx.fill();
return canvas;
};
SymbolMorph.prototype.drawSymbolFlash = function (canvas, color) {
// answer a canvas showing a flash
var ctx = canvas.getContext('2d'),
w = canvas.width,
w3 = w / 3,
h = canvas.height,
h3 = h / 3,
off = h3 / 3;
ctx.fillStyle = color.toString();
ctx.beginPath();
ctx.moveTo(w3, 0);
ctx.lineTo(0, h3);
ctx.lineTo(w3, h3);
ctx.lineTo(0, h3 * 2);
ctx.lineTo(w3, h3 * 2);
ctx.lineTo(0, h);
ctx.lineTo(w, h3 * 2 - off);
ctx.lineTo(w3 * 2, h3 * 2 - off);
ctx.lineTo(w, h3 - off);
ctx.lineTo(w3 * 2, h3 - off);
ctx.lineTo(w, 0);
ctx.closePath();
ctx.fill();
return canvas;
};
SymbolMorph.prototype.drawSymbolBrush = function (canvas, color) {
// answer a canvas showing a paintbrush
var ctx = canvas.getContext('2d'),
w = canvas.width,
h = canvas.height,
l = Math.max(w / 30, 0.5);
ctx.fillStyle = color.toString();
ctx.lineWidth = l * 2;
ctx.beginPath();
ctx.moveTo(w / 8 * 3, h / 2);
ctx.quadraticCurveTo(0, h / 2, l, h - l);
ctx.quadraticCurveTo(w / 2, h, w / 2, h / 8 * 5);
ctx.closePath();
ctx.fill();
ctx.lineJoin = 'round';
ctx.lineCap = 'round';
ctx.strokeStyle = color.toString();
ctx.moveTo(w / 8 * 3, h / 2);
ctx.lineTo(w * 0.75, l);
ctx.quadraticCurveTo(w, 0, w - l, h * 0.25);
ctx.stroke();
ctx.moveTo(w / 2, h / 8 * 5);
ctx.lineTo(w - l, h * 0.25);
ctx.stroke();
return canvas;
};
SymbolMorph.prototype.drawSymbolRectangle = function (canvas, color) {
// answer a canvas showing a rectangle
var ctx = canvas.getContext('2d'),
w = canvas.width,
h = canvas.width,
l = Math.max(w / 20, 0.5);
ctx.strokeStyle = color.toString();
ctx.lineWidth = l * 2;
ctx.beginPath();
ctx.moveTo(l, l);
ctx.lineTo(w - l, l);
ctx.lineTo(w - l, h - l);
ctx.lineTo(l, h - l);
ctx.closePath();
ctx.stroke();
return canvas;
};
SymbolMorph.prototype.drawSymbolRectangleSolid = function (canvas, color) {
// answer a canvas showing a solid rectangle
var ctx = canvas.getContext('2d'),
w = canvas.width,
h = canvas.width;
ctx.fillStyle = color.toString();
ctx.beginPath();
ctx.moveTo(0, 0);
ctx.lineTo(w, 0);
ctx.lineTo(w, h);
ctx.lineTo(0, h);
ctx.closePath();
ctx.fill();
return canvas;
};
SymbolMorph.prototype.drawSymbolCircle = function (canvas, color) {
// answer a canvas showing a circle
var ctx = canvas.getContext('2d'),
w = canvas.width,
l = Math.max(w / 20, 0.5);
ctx.strokeStyle = color.toString();
ctx.lineWidth = l * 2;
ctx.arc(w / 2, w / 2, w / 2 - l, radians(0), radians(360), false);
ctx.stroke();
return canvas;
};
SymbolMorph.prototype.drawSymbolCircleSolid = function (canvas, color) {
// answer a canvas showing a solid circle
var ctx = canvas.getContext('2d'),
w = canvas.width;
ctx.fillStyle = color.toString();
ctx.arc(w / 2, w / 2, w / 2, radians(0), radians(360), false);
ctx.fill();
return canvas;
};
SymbolMorph.prototype.drawSymbolLine = function (canvas, color) {
// answer a canvas showing a diagonal line
var ctx = canvas.getContext('2d'),
w = canvas.width,
h = canvas.height,
l = Math.max(w / 20, 0.5);
ctx.strokeStyle = color.toString();
ctx.lineWidth = l * 2;
ctx.lineCap = 'round';
ctx.moveTo(l, l);
ctx.lineTo(w - l, h - l);
ctx.stroke();
return canvas;
};
SymbolMorph.prototype.drawSymbolCrosshairs = function (canvas, color) {
// answer a canvas showing a crosshairs
var ctx = canvas.getContext('2d'),
w = canvas.width,
h = canvas.height,
l = 0.5;
ctx.strokeStyle = color.toString();
ctx.lineWidth = l * 2;
ctx.moveTo(l, h / 2);
ctx.lineTo(w - l, h / 2);
ctx.stroke();
ctx.moveTo(w / 2, l);
ctx.lineTo(w / 2, h - l);
ctx.stroke();
ctx.moveTo(w / 2, h / 2);
ctx.arc(w / 2, w / 2, w / 3 - l, radians(0), radians(360), false);
ctx.stroke();
return canvas;
};
SymbolMorph.prototype.drawSymbolPaintbucket = function (canvas, color) {
// answer a canvas showing a paint bucket
var ctx = canvas.getContext('2d'),
w = canvas.width,
h = canvas.height,
n = canvas.width / 5,
l = Math.max(w / 30, 0.5);
ctx.strokeStyle = color.toString();
ctx.lineWidth = l * 2;
ctx.beginPath();
ctx.moveTo(n * 2, n);
ctx.lineTo(n * 4, n * 3);
ctx.lineTo(n * 3, n * 4);
ctx.quadraticCurveTo(n * 2, h, n, n * 4);
ctx.quadraticCurveTo(0, n * 3, n, n * 2);
ctx.closePath();
ctx.stroke();
ctx.lineWidth = l;
ctx.moveTo(n * 2, n * 2.5);
ctx.arc(n * 2, n * 2.5, l, radians(0), radians(360), false);
ctx.stroke();
ctx.moveTo(n * 2, n * 2.5);
ctx.lineTo(n * 2, n / 2 + l);
ctx.stroke();
ctx.arc(n * 1.5, n / 2 + l, n / 2, radians(0), radians(180), true);
ctx.stroke();
ctx.moveTo(n, n / 2 + l);
ctx.lineTo(n, n * 2);
ctx.stroke();
ctx.fillStyle = color.toString();
ctx.beginPath();
ctx.moveTo(n * 3.5, n * 3.5);
ctx.quadraticCurveTo(w, n * 3.5, w - l, h);
ctx.lineTo(w, h);
ctx.quadraticCurveTo(w, n * 2, n * 2.5, n * 1.5);
ctx.lineTo(n * 4, n * 3);
ctx.closePath();
ctx.fill();
return canvas;
};
SymbolMorph.prototype.drawSymbolEraser = function (canvas, color) {
// answer a canvas showing an eraser
var ctx = canvas.getContext('2d'),
w = canvas.width,
h = canvas.height,
n = canvas.width / 4,
l = Math.max(w / 20, 0.5);
ctx.strokeStyle = color.toString();
ctx.lineWidth = l * 2;
ctx.beginPath();
ctx.moveTo(n * 3, l);
ctx.lineTo(l, n * 3);
ctx.quadraticCurveTo(n, h, n * 2, n * 3);
ctx.lineTo(w - l, n);
ctx.closePath();
ctx.stroke();
ctx.fillStyle = color.toString();
ctx.beginPath();
ctx.moveTo(n * 3, 0);
ctx.lineTo(n * 1.5, n * 1.5);
ctx.lineTo(n * 2.5, n * 2.5);
ctx.lineTo(w, n);
ctx.closePath();
ctx.fill();
return canvas;
};
SymbolMorph.prototype.drawSymbolPipette = function (canvas, color) {
// answer a canvas showing an eyedropper
var ctx = canvas.getContext('2d'),
w = canvas.width,
h = canvas.height,
n = canvas.width / 4,
n2 = n / 2,
l = Math.max(w / 20, 0.5);
ctx.strokeStyle = color.toString();
ctx.lineWidth = l * 2;
ctx.beginPath();
ctx.moveTo(l, h - l);
ctx.quadraticCurveTo(n2, h - n2, n2, h - n);
ctx.lineTo(n * 2, n * 1.5);
ctx.stroke();
ctx.beginPath();
ctx.moveTo(l, h - l);
ctx.quadraticCurveTo(n2, h - n2, n, h - n2);
ctx.lineTo(n * 2.5, n * 2);
ctx.stroke();
ctx.fillStyle = color.toString();
ctx.arc(n * 3, n, n - l, radians(0), radians(360), false);
ctx.fill();
ctx.beginPath();
ctx.moveTo(n * 2, n);
ctx.lineTo(n * 3, n * 2);
ctx.stroke();
return canvas;
};
SymbolMorph.prototype.drawSymbolSpeechBubble = function (canvas, color) {
// answer a canvas showing a speech bubble
var ctx = canvas.getContext('2d'),
w = canvas.width,
h = canvas.height,
n = canvas.width / 3,
l = Math.max(w / 20, 0.5);
ctx.fillStyle = color.toString();
ctx.lineWidth = l * 2;
ctx.beginPath();
ctx.moveTo(n, n * 2);
ctx.quadraticCurveTo(l, n * 2, l, n);
ctx.quadraticCurveTo(l, l, n, l);
ctx.lineTo(n * 2, l);
ctx.quadraticCurveTo(w - l, l, w - l, n);
ctx.quadraticCurveTo(w - l, n * 2, n * 2, n * 2);
ctx.lineTo(n / 2, h - l);
ctx.closePath();
ctx.fill();
return canvas;
};
SymbolMorph.prototype.drawSymbolSpeechBubbleOutline = function (
canvas,
color
) {
// answer a canvas showing a speech bubble
var ctx = canvas.getContext('2d'),
w = canvas.width,
h = canvas.height,
n = canvas.width / 3,
l = Math.max(w / 20, 0.5);
ctx.strokeStyle = color.toString();
ctx.lineWidth = l * 2;
ctx.beginPath();
ctx.moveTo(n, n * 2);
ctx.quadraticCurveTo(l, n * 2, l, n);
ctx.quadraticCurveTo(l, l, n, l);
ctx.lineTo(n * 2, l);
ctx.quadraticCurveTo(w - l, l, w - l, n);
ctx.quadraticCurveTo(w - l, n * 2, n * 2, n * 2);
ctx.lineTo(n / 2, h - l);
ctx.closePath();
ctx.stroke();
return canvas;
};
SymbolMorph.prototype.drawSymbolTurnBack = function (canvas, aColor) {
var ctx = canvas.getContext('2d'),
w = canvas.width,
h = canvas.height,
w2 = canvas.width / 2,
h2 = canvas.height / 2,
l = Math.max(w / 20, 0.5);
ctx.fillStyle = aColor.toString();
ctx.lineWidth = l * 2;
ctx.beginPath();
ctx.moveTo(0, h2);
ctx.lineTo(w2, 0);
ctx.lineTo(w2, h);
ctx.closePath();
ctx.fill();
ctx.lineWidth = l * 3;
ctx.strokeStyle = aColor.toString();
ctx.beginPath();
ctx.arc(w2, h, h2, radians(0), radians(-90), true);
ctx.stroke();
return canvas;
};
SymbolMorph.prototype.drawSymbolTurnForward = function (canvas, aColor) {
var ctx = canvas.getContext('2d'),
w = canvas.width,
h = canvas.height,
w2 = canvas.width / 2,
h2 = canvas.height / 2,
l = Math.max(w / 20, 0.5);
ctx.fillStyle = aColor.toString();
ctx.lineWidth = l * 2;
ctx.beginPath();
ctx.moveTo(w, h2);
ctx.lineTo(w2, 0);
ctx.lineTo(w2, h);
ctx.closePath();
ctx.fill();
ctx.lineWidth = l * 3;
ctx.strokeStyle = aColor.toString();
ctx.beginPath();
ctx.arc(w2, h, h2, radians(-180), radians(-90), false);
ctx.stroke();
return canvas;
};
SymbolMorph.prototype.drawSymbolArrowUp = function (canvas, color) {
// answer a canvas showing an up arrow
var ctx = canvas.getContext('2d'),
w = canvas.width,
h = canvas.height,
n = canvas.width / 2,
l = Math.max(w / 20, 0.5);
ctx.fillStyle = color.toString();
ctx.lineWidth = l * 2;
ctx.beginPath();
ctx.moveTo(l, n);
ctx.lineTo(n, l);
ctx.lineTo(w - l, n);
ctx.lineTo(w * 0.65, n);
ctx.lineTo(w * 0.65, h - l);
ctx.lineTo(w * 0.35, h - l);
ctx.lineTo(w * 0.35, n);
ctx.closePath();
ctx.fill();
return canvas;
};
SymbolMorph.prototype.drawSymbolArrowUpOutline = function (canvas, color) {
// answer a canvas showing an up arrow
var ctx = canvas.getContext('2d'),
w = canvas.width,
h = canvas.height,
n = canvas.width / 2,
l = Math.max(w / 20, 0.5);
ctx.strokeStyle = color.toString();
ctx.lineWidth = l * 2;
ctx.beginPath();
ctx.moveTo(l, n);
ctx.lineTo(n, l);
ctx.lineTo(w - l, n);
ctx.lineTo(w * 0.65, n);
ctx.lineTo(w * 0.65, h - l);
ctx.lineTo(w * 0.35, h - l);
ctx.lineTo(w * 0.35, n);
ctx.closePath();
ctx.stroke();
return canvas;
};
SymbolMorph.prototype.drawSymbolArrowDown = function (canvas, color) {
// answer a canvas showing a down arrow
var ctx = canvas.getContext('2d'),
w = canvas.width;
ctx.save();
ctx.translate(w, w);
ctx.rotate(radians(180));
this.drawSymbolArrowUp(canvas, color);
ctx.restore();
return canvas;
};
SymbolMorph.prototype.drawSymbolArrowDownOutline = function (canvas, color) {
// answer a canvas showing a down arrow
var ctx = canvas.getContext('2d'),
w = canvas.width;
ctx.save();
ctx.translate(w, w);
ctx.rotate(radians(180));
this.drawSymbolArrowUpOutline(canvas, color);
ctx.restore();
return canvas;
};
SymbolMorph.prototype.drawSymbolArrowLeft = function (canvas, color) {
// answer a canvas showing a left arrow
var ctx = canvas.getContext('2d'),
w = canvas.width;
ctx.save();
ctx.translate(0, w);
ctx.rotate(radians(-90));
this.drawSymbolArrowUp(canvas, color);
ctx.restore();
return canvas;
};
SymbolMorph.prototype.drawSymbolArrowLeftOutline = function (canvas, color) {
// answer a canvas showing a left arrow
var ctx = canvas.getContext('2d'),
w = canvas.width;
ctx.save();
ctx.translate(0, w);
ctx.rotate(radians(-90));
this.drawSymbolArrowUpOutline(canvas, color);
ctx.restore();
return canvas;
};
SymbolMorph.prototype.drawSymbolArrowRight = function (canvas, color) {
// answer a canvas showing a right arrow
var ctx = canvas.getContext('2d'),
w = canvas.width;
ctx.save();
ctx.translate(w, 0);
ctx.rotate(radians(90));
this.drawSymbolArrowUp(canvas, color);
ctx.restore();
return canvas;
};
SymbolMorph.prototype.drawSymbolArrowRightOutline = function (canvas, color) {
// answer a canvas showing a right arrow
var ctx = canvas.getContext('2d'),
w = canvas.width;
ctx.save();
ctx.translate(w, 0);
ctx.rotate(radians(90));
this.drawSymbolArrowUpOutline(canvas, color);
ctx.restore();
return canvas;
};
SymbolMorph.prototype.drawSymbolRobot = function (canvas, color) {
// answer a canvas showing a humanoid robot
var ctx = canvas.getContext('2d'),
w = canvas.width,
h = canvas.height,
n = canvas.width / 6,
n2 = n / 2,
l = Math.max(w / 20, 0.5);
ctx.fillStyle = color.toString();
//ctx.lineWidth = l * 2;
ctx.beginPath();
ctx.moveTo(n + l, n);
ctx.lineTo(n * 2, n);
ctx.lineTo(n * 2.5, n * 1.5);
ctx.lineTo(n * 3.5, n * 1.5);
ctx.lineTo(n * 4, n);
ctx.lineTo(n * 5 - l, n);
ctx.lineTo(n * 4, n * 3);
ctx.lineTo(n * 4, n * 4 - l);
ctx.lineTo(n * 2, n * 4 - l);
ctx.lineTo(n * 2, n * 3);
ctx.closePath();
ctx.fill();
ctx.beginPath();
ctx.moveTo(n * 2.75, n + l);
ctx.lineTo(n * 2.4, n);
ctx.lineTo(n * 2.2, 0);
ctx.lineTo(n * 3.8, 0);
ctx.lineTo(n * 3.6, n);
ctx.lineTo(n * 3.25, n + l);
ctx.closePath();
ctx.fill();
ctx.beginPath();
ctx.moveTo(n * 2.5, n * 4);
ctx.lineTo(n, n * 4);
ctx.lineTo(n2 + l, h);
ctx.lineTo(n * 2, h);
ctx.closePath();
ctx.fill();
ctx.beginPath();
ctx.moveTo(n * 3.5, n * 4);
ctx.lineTo(n * 5, n * 4);
ctx.lineTo(w - (n2 + l), h);
ctx.lineTo(n * 4, h);
ctx.closePath();
ctx.fill();
ctx.beginPath();
ctx.moveTo(n, n);
ctx.lineTo(l, n * 1.5);
ctx.lineTo(l, n * 3.25);
ctx.lineTo(n * 1.5, n * 3.5);
ctx.closePath();
ctx.fill();
ctx.beginPath();
ctx.moveTo(n * 5, n);
ctx.lineTo(w - l, n * 1.5);
ctx.lineTo(w - l, n * 3.25);
ctx.lineTo(n * 4.5, n * 3.5);
ctx.closePath();
ctx.fill();
return canvas;
};
SymbolMorph.prototype.drawSymbolMagnifyingGlass = function (canvas, color) {
// answer a canvas showing a magnifying glass
var ctx = canvas.getContext('2d'),
gradient,
w = canvas.width,
h = canvas.height,
r = w * 0.3,
x = w * 2 / 3 - Math.sqrt(r),
y = h / 3 + Math.sqrt(r),
l = Math.max(w / 5, 0.5);
ctx.strokeStyle = color.toString();
gradient = ctx.createRadialGradient(
x,
y,
0,
x + r,
y + r,
w
);
gradient.addColorStop(0, color.inverted().lighter(50).toString());
gradient.addColorStop(1, color.inverted().darker(25).toString());
ctx.fillStyle = gradient;
ctx.arc(x, y, r, radians(0), radians(360), false);
ctx.fill();
ctx.lineWidth = l / 2;
ctx.arc(x, y, r, radians(0), radians(360), false);
ctx.stroke();
ctx.lineWidth = l;
ctx.beginPath();
ctx.moveTo(l / 2, h - l / 2);
ctx.lineTo(x - Math.sqrt(r + l), y + Math.sqrt(r + l));
ctx.closePath();
ctx.stroke();
return canvas;
};
SymbolMorph.prototype.drawSymbolNotes = function (canvas, color) {
// answer a canvas showing two musical notes
var ctx = canvas.getContext('2d'),
size = canvas.width,
r = size / 6,
l = Math.max(r / 3, 1);
ctx.strokeStyle = color.toString();
ctx.fillStyle = color.toString();
ctx.arc(r, size - r, r, radians(0), radians(360), false);
ctx.fill();
ctx.arc(size - r, size - (r * 2), r, radians(0), radians(360), false);
ctx.fill();
ctx.beginPath();
ctx.moveTo(r * 2 - l, r);
ctx.lineTo(size, 0);
ctx.lineTo(size, r);
ctx.lineTo(r * 2 - l, r * 2);
ctx.closePath();
ctx.fill();
ctx.lineWidth = l;
ctx.beginPath();
ctx.moveTo(r * 2 - (l / 2), size - r);
ctx.lineTo(r * 2 - (l / 2), r + l);
ctx.stroke();
ctx.beginPath();
ctx.moveTo(size - (l / 2), size - (r * 2));
ctx.lineTo(size - (l / 2), l);
ctx.stroke();
return canvas;
};
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