How to use canvas in HTML5 to achieve the effect of gradient text-HTML Tutorial-php.cn

How to use canvas in HTML5 to achieve the effect of gradient text

yulia

Release： 2018-10-22 10:27:18

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Use the canvas in HTML5 to achieve the gradient text effect. The syntax and parameter settings required are as follows. Friends who are unclear can take a look.

1. fillText( )

Syntax: context.fillText(text,x,y,maxWidth)

text indicates that it needs to be output on the canvas The text
x represents the X-axis coordinate where the text starts to be drawn
y represents the Y-axis coordinate where the text starts to be drawn
maxWidth represents the maximum text width allowed, the unit is pixels, and is an optional value.

2. createLinearGradient( )

Syntax: context.createLinearGradient(x0,y0,x1,y1)

x0 represents the X of the gradient starting point Axis coordinate
y0 represents the Y-axis coordinate of the gradient start point
x1 represents the X-axis coordinate of the gradient end point
y1 represents the Y-axis coordinate of the gradient end point

Example: 1 : Make a normal text (no color gradient), the code is as follows:

<!DOCTYPE html>
<html>
 <head>
  <meta charset="UTF-8">
  <title></title>
 </head>
 <body>
  <canvas id="myCanvas" width="300" height="150" style="border:1px solid #ccc;"></canvas>
 </body>
 <script type="text/javascript">  
  var c=document.getElementById("myCanvas");
  var ctx=c.getContext("2d");  
  ctx.font="20px Georgia";
  ctx.fillText("学习使我快乐",10,50);
 </script>
</html>

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The effect picture is as shown:

How to use canvas in HTML5 to achieve the effect of gradient text

Example 2: Make a gradient text , the specific code is as follows:

ctx.font="30px Verdana";
  // Create gradient
  var gradient=ctx.createLinearGradient(0,0,c.width,0);
  gradient.addColorStop("0","orange");
  gradient.addColorStop("0.5","blue");
  gradient.addColorStop("1.0","red");
  // Fill with gradient
  ctx.fillStyle=gradient;
  ctx.fillText("have a nice day ",10,100);

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Rendering:

How to use canvas in HTML5 to achieve the effect of gradient text

When making gradient text, first use createLinearGradient() to create a gradient, and then use fillStyle to change the gradient Apply to text.

The above introduces how to use canvas in HTML5 to create gradient text effects. It is simple and practical. Beginners can practice it by themselves. I hope you can create more cool effects.

For more related courses, please visit Html5 video tutorial

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