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SECURITY_ERR: DOM Exception 18

In some web browsers, such as Google Chrome, you might experience an error (SE‐

CURITY_ERR: DOM Exception 18) when trying to export the canvas while an image

is displayed (like the pattern fill type in Example 3-1). This usually occurs because the

web browser is executing a web page locally (loaded from the filesystem). These errors

can usually be removed by loading the HTML page from a web server—either remotely

or on your local machine.

Final Version of Text Arranger

The final version of Text Arranger (3.0) brings together all the HTML5 Text API features

we have discussed in this chapter. (See Example 3-1.) Play with the final app, and see

how the different options interact with one another. Here are a couple things you might

find interesting:

• Increasing the text size with a pattern that is the size of the canvas changes the

pattern on the text. (It acts like a mask or window into the pattern itself.)

• Canvas width and height are affected by the style width and height (scaling).

Example 3-1. Text Arranger 3.0

<!doctype html>

<head>

<title>CH3EX3: Text Arranger 3.0</title>

window.addEventListener("load", eventWindowLoaded, false);

function eventWindowLoaded() {

canvasApp();

}

function canvasSupport () {

return Modernizr.canvas;

}

function eventWindowLoaded() {

var patternPreload = new Image();

patternPreload.onload = eventAssetsLoaded;

patternPreload.src = "texture.jpg";

}

Final Version of Text Arranger | 119

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function eventAssetsLoaded() {

canvasApp();

}

function canvasApp() {

var message = "your text";

var fontSize = "50";

var fontFace = "serif";

var textFillColor = "#ff0000";

var textAlpha = 1;

var shadowX = 1;

var shadowY = 1;

var shadowBlur = 1;

var shadowColor = "#707070";

var textBaseline = "middle";

var textAlign = "center";

var fillOrStroke ="fill";

var fontWeight = "normal";

var fontStyle = "normal";

var fillType = "colorFill";

var textFillColor2 = "#000000";

var pattern = new Image();

if (!canvasSupport()) {

return;

}

var theCanvas = document.getElementById("canvasOne");

var context = theCanvas.getContext("2d");

var formElement = document.getElementById("textBox");

formElement.addEventListener("keyup", textBoxChanged, false);

formElement = document.getElementById("fillOrStroke");

formElement.addEventListener("change", fillOrStrokeChanged, false);

formElement = document.getElementById("textSize");

formElement.addEventListener("change", textSizeChanged, false);

formElement = document.getElementById("textFillColor");

formElement.addEventListener("change", textFillColorChanged, false);

formElement = document.getElementById("textFont");

formElement.addEventListener("change", textFontChanged, false);

formElement = document.getElementById("textBaseline");

formElement.addEventListener("change", textBaselineChanged, false);

formElement = document.getElementById("textAlign");

120 | Chapter 3: The HTML5 Canvas Text API

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formElement.addEventListener("change", textAlignChanged, false);

formElement = document.getElementById("fontWeight");

formElement.addEventListener("change", fontWeightChanged, false);

formElement = document.getElementById("fontStyle");

formElement.addEventListener("change", fontStyleChanged, false);

formElement = document.getElementById("shadowX");

formElement.addEventListener("change", shadowXChanged, false);

formElement = document.getElementById("shadowY");

formElement.addEventListener("change", shadowYChanged, false);

formElement = document.getElementById("shadowBlur");

formElement.addEventListener("change", shadowBlurChanged, false);

formElement = document.getElementById("shadowColor");

formElement.addEventListener("change", shadowColorChanged, false);

formElement = document.getElementById("textAlpha");

formElement.addEventListener("change", textAlphaChanged, false);

formElement = document.getElementById("textFillColor2");

formElement.addEventListener("change", textFillColor2Changed, false);

formElement = document.getElementById("fillType");

formElement.addEventListener("change", fillTypeChanged, false);

formElement = document.getElementById("canvasWidth");

formElement.addEventListener("change", canvasWidthChanged, false);

formElement = document.getElementById("canvasHeight");

formElement.addEventListener("change", canvasHeightChanged, false);

formElement = document.getElementById("canvasStyleWidth");

formElement.addEventListener("change", canvasStyleSizeChanged, false);

formElement = document.getElementById("canvasStyleHeight");

formElement.addEventListener("change", canvasStyleSizeChanged, false);

formElement = document.getElementById("createImageData");

formElement.addEventListener("click", createImageDataPressed, false);

pattern.src = "texture.jpg";

drawScreen();

function drawScreen() {

//Background

context.globalAlpha = 1;

Final Version of Text Arranger | 121

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context.shadowColor = "#707070";

context.shadowOffsetX = 0;

context.shadowOffsetY = 0;

context.shadowBlur = 0;

context.fillStyle = "#ffffaa";

context.fillRect(0, 0, theCanvas.width, theCanvas.height); //Box

context.strokeStyle = "#000000";

context.strokeRect(5, 5, theCanvas.width-10, theCanvas.height-10);

//Text

context.textBaseline = textBaseline;

context.textAlign = textAlign;

context.font = fontWeight + " " + fontStyle + " " + fontSize + "px " + fontFace;

context.shadowColor = shadowColor;

context.shadowOffsetX = shadowX;

context.shadowOffsetY = shadowY;

context.shadowBlur = shadowBlur;

context.globalAlpha = textAlpha;

var xPosition = (theCanvas.width/2);

var yPosition = (theCanvas.height/2);

var metrics = context.measureText(message);

var textWidth = metrics.width;

var tempColor;

if (fillType == "colorFill") {

tempColor = textFillColor;

} else if (fillType == "linearGradient") {

var gradient = context.createLinearGradient(xPosition-

textWidth/2, yPosition, textWidth, yPosition);

gradient.addColorStop(0,textFillColor);

gradient.addColorStop(.6,textFillColor2);

tempColor = gradient;

} else if (fillType == "radialGradient") {

var gradient = context.createRadialGradient(xPosition, yPosition,

fontSize, xPosition+textWidth, yPosition, 1);

gradient.addColorStop(0,textFillColor);

gradient.addColorStop(.6,textFillColor2);

tempColor = gradient;

} else if (fillType == "pattern") {

var tempColor = context.createPattern(pattern,"repeat")

} else {

tempColor = textFillColor;

}

switch(fillOrStroke) {

case "fill":

context.fillStyle = tempColor;

context.fillText (message, xPosition,yPosition);

break;

122 | Chapter 3: The HTML5 Canvas Text API

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case "stroke":

context.strokeStyle = tempColor;

context.strokeText (message, xPosition,yPosition);

break;

case "both":

context.fillStyle = tempColor;

context.fillText (message, xPosition,yPosition);

context.strokeStyle = "#000000";

context.strokeText (message, xPosition,yPosition);

break;

}

function textBoxChanged(e) {

var target = e.target;

message = target.value;

drawScreen();

}

function textBaselineChanged(e) {

var target = e.target;

textBaseline = target.value;

drawScreen();

}

function textAlignChanged(e) {

var target = e.target;

textAlign = target.value;

drawScreen();

}

function fillOrStrokeChanged(e) {

var target = e.target;

fillOrStroke = target.value;

drawScreen();

}

function textSizeChanged(e) {

var target = e.target;

fontSize = target.value;

drawScreen();

}

function textFillColorChanged(e) {

var target = e.target;

textFillColor = "#" + target.value;

drawScreen();

}

function textFontChanged(e) {

Final Version of Text Arranger | 123

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var target = e.target;

fontFace = target.value;

drawScreen();

}

function fontWeightChanged(e) {

var target = e.target;

fontWeight = target.value;

drawScreen();

}

function fontStyleChanged(e) {

var target = e.target;

fontStyle = target.value;

drawScreen();

}

function shadowXChanged(e) {

var target = e.target;

shadowX = target.value;

drawScreen();

}

function shadowYChanged(e) {

var target = e.target;

shadowY = target.value;

drawScreen();

}

function shadowBlurChanged(e) {

var target = e.target;

shadowBlur = target.value;

drawScreen();

}

function shadowColorChanged(e) {

var target = e.target;

shadowColor = target.value;

drawScreen();

}

function textAlphaChanged(e) {

var target = e.target;

textAlpha = (target.value);

drawScreen();

}

function textFillColor2Changed(e) {

var target = e.target;

textFillColor2 = "#" + target.value;

drawScreen();

}

124 | Chapter 3: The HTML5 Canvas Text API

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function fillTypeChanged(e) {

var target = e.target;

fillType = target.value;

drawScreen();

}

function canvasWidthChanged(e) {

var target = e.target;

theCanvas.width = target.value;

drawScreen();

}

function canvasHeightChanged(e) {

var target = e.target;

theCanvas.height = target.value;

drawScreen();

}

function canvasStyleSizeChanged(e) {

var styleWidth = document.getElementById("canvasStyleWidth");

var styleHeight = document.getElementById("canvasStyleHeight");

var styleValue = "width:" + styleWidth.value + "px; height:" +

styleHeight.value +"px;";

theCanvas.setAttribute("style", styleValue );

drawScreen();

}

function createImageDataPressed(e) {

var imageDataDisplay = document.getElementById("imageDataDisplay");

imageDataDisplay.value = theCanvas.toDataURL();

window.open(imageDataDisplay.value,"canvasImage","left=0,top=0,width=" +

theCanvas.width + ",height=" + theCanvas.height +

",toolbar=0,resizable=0");

}

</script>

</head>

<body>

Your browser does not support HTML5 Canvas.

</canvas>

<form>

Text: <input id="textBox" placeholder="your text" />

<br>

Text Font: <select id="textFont">

Final Version of Text Arranger | 125

<option value="serif">serif</option>

<option value="sans-serif">sans-serif</option>

<option value="cursive">cursive</option>

<option value="fantasy">fantasy</option>

<option value="monospace">monospace</option>

</select>

<br> Font Weight:

<option value="normal">normal</option>

<option value="bolder">bolder</option>

<option value="lighter">lighter</option>

</select>

<br>

Font Style:

<option value="normal">normal</option>

<option value="italic">italic</option>

<option value="oblique">oblique</option>

</select>

<br>

Text Size: <input type="range" id="textSize"

min="0"

max="200"

step="1"

value="50"/>

<br>

Fill Type: <select id="fillType">

<option value="colorFill">Color Fill</option>

<option value="linearGradient">Linear Gradient</option>

<option value="radialGradient">Radial Gradient</option>

<option value="pattern">pattern</option>

</select>

<br>

Text Color: <input class="color" id="textFillColor" value="FF0000"/>

<br>

Text Color 2: <input class="color" id="textFillColor2" value ="000000"/>

<br>

Fill Or Stroke: <select id="fillOrStroke">

<option value="stroke">stroke</option>

</select>

<br>

Text Baseline <select id="textBaseline">

<option value="middle">middle</option>

<option value="hanging">hanging</option>

<option value="alphabetic">alphabetic</option>

<option value="ideographic">ideographic</option>

<option value="bottom">bottom</option>

</select>

126 | Chapter 3: The HTML5 Canvas Text API

<br>

Text Align <select id="textAlign">

<option value="center">center</option>

<option value="start">start</option>

<option value="right">right</option>

</select>

<br>

Alpha: <input type="range" id="textAlpha"

min="0.0"

max="1.0"

step="0.01"

value="1.0"/>

<br>

Shadow X:<input type="range" id="shadowX"

min="−100"

max="100"

step="1"

value="1"/>

<br>

Shadow Y:<input type="range" id="shadowY"

min="−100"

max="100"

step="1"

value="1"/>

<br>

Shadow Blur: <input type="range" id="shadowBlur"

min="1"

max="100"

step="1"

value="1" />

<br>

Shadow Color: <input class="color" id="shadowColor" value="707070"/>

<br>

Canvas Width: <input type="range" id="canvasWidth"

min="0"

max="1000"

step="1"

value="500"/>

<br>

Canvas Height:

<input type="range" id="canvasHeight"

min="0"

max="1000"

step="1"

value="300"/>

<br>

Canvas Style Width: <input type="range" id="canvasStyleWidth"

min="0"

max="1000"

step="1"

Final Version of Text Arranger | 127

value="500"/>

<br>

Canvas Style Height:

<input type="range" id="canvasStyleHeight"

min="0"

max="1000"

step="1"

value="300"/>

<br>

<br>

</form>

</div>

</body>

</html>

Animated Gradients

Before we leave the topic of text, we would like to introduce some animation into the

mix. Everything you have seen so far in this chapter has been pretty much static. While

text on HTML5 Canvas is really cool, it is not too far from what could be accomplished

in standard HTML. Static text is static, and its utility when not being styled with CSS

(again, the Canvas currently does not support CSS styling) might make you choose

another solution for a pure text application.

However, animation is where the Canvas shows its utility beyond standard HTML. For

this example, we will move away from Text Arranger and create some animated text by

using only gradient fills. The gradient fills will “animate” by moving up in the text fill.

The effect here is similar to what old video game and computer systems (especially those

from Atari) used to create animated title screens.

Figure 3-12 shows what a single frame of the animation looks like on the Canvas.

128 | Chapter 3: The HTML5 Canvas Text API

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