尝试在worklight 6.1中调试适配器Java代码(Trying to debug adapter Java Code in worklight 6.1)

 好的，我已经找到了解决方案。 基本上，createPattern（）可以将image或canvas元素作为其第一个参数。 所以你需要做以下事情： 
 
var pattern_canvas = document.createElement('canvas');

pattern_canvas.width = texture_width;
pattern_canvas.height = texture_height;

var pattern_context = pattern_canvas.getContext('2d');

pattern_context.drawImage(img , texture_sx , texture_sy , texture_width , texture_height);

var final_pattern = canvas_context.createPattern(pattern_canvas , "repeat");

canvas_context.fillStyle = final_pattern;
canvas_context.fillRect( 0 , 0 , canvas.width , canvas.height );
 
 如果执行此操作，则canvas元素将重复绘制pattern_canvas以覆盖其尺寸。 

Okay I've worked out the solution to this. Basically, createPattern() can take either an image or canvas element as its first argument. So you need to do the following:
 
var pattern_canvas = document.createElement('canvas');

pattern_canvas.width = texture_width;
pattern_canvas.height = texture_height;

var pattern_context = pattern_canvas.getContext('2d');

pattern_context.drawImage(img , texture_sx , texture_sy , texture_width , texture_height);

var final_pattern = canvas_context.createPattern(pattern_canvas , "repeat");

canvas_context.fillStyle = final_pattern;
canvas_context.fillRect( 0 , 0 , canvas.width , canvas.height );
 
If you do this then your canvas element will have pattern_canvas repeatedly drawn to cover its dimensions.