OnDraw中填充形状canvas.drawLine创建 [英] onDraw fill shape create with canvas.drawLine

问题描述

我为了绘制一个矩形画4条线（canvas.drawLine）。是否有可能以填充矩形区域？ （我知道Android有一个rectDraw。煤矿是唯一的好奇心）

先谢谢了。

---

确定..我以前也路径创建一个路径段。继code ..请ü可以解释如何填写内部区域？

 `涂料粉刷=新的油漆（Paint.ANTI_ALIAS_FLAG）;
     paint.setStrokeWidth（2）;
     paint.setColor（android.graphics.Color.RED）;
     paint.setStyle（Paint.Style.FILL_AND_STROKE）;
     paint.setAntiAlias​​（真）;
     path.reset（）;
     path.setFillType（Path.FillType.INVERSE_EVEN_ODD）;
     path.moveTo（mPin [0] .getX（）+ 10，mPin [0] .getY（）+ 10）;
     path.lineTo（mPin [1] .getX（）+ 10，mPin [1] .getY（）+ 10）;     path.moveTo（mPin [1] .getX（）+ 10，mPin [1] .getY（）+ 10）;
     path.lineTo（mPin [3] .getX（）+ 10，mPin [3] .getY（）+ 10）;     path.moveTo（mPin [3] .getX（）+ 10，mPin [3] .getY（）+ 10）;
     path.lineTo（mPin [2] .getX（）+ 10，mPin [2] .getY（）+ 10）;     path.moveTo（mPin [2] .getX（）+ 10，mPin [2] .getY（）+ 10）;
     path.lineTo（mPin [0] .getX（）+ 10，mPin [0] .getY（）+ 10）;
     paint.setShader（新的LinearGradient（0，0，0，的getHeight（），Color.BLACK，Color.WHITE，Shader.TileMode.MIRROR））;
     c.drawPath（路径，油漆）;`
 

解决方案

您可以填充rect，如果你画的线段作为路径。但要只需填写由四个悬空，但相交线段围成的区域，我认为你必须编写自己的程序。搜索洪水填充或种子饱满。

i draw 4 lines (canvas.drawLine) in order to draw a rectangle. Is there any possibility to fill the area of the rectangle? (I know that android have a rectDraw. Mine is only curiosity)

thanks in advance.

---

ok.. I ve also a path created a path segment. Following the code.. Please can u explain how fill the internal area?

    `Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);            
     paint.setStrokeWidth(2);
     paint.setColor(android.graphics.Color.RED);
     paint.setStyle(Paint.Style.FILL_AND_STROKE);
     paint.setAntiAlias(true);
     path.reset();
     path.setFillType(Path.FillType.INVERSE_EVEN_ODD);      
     path.moveTo(mPin[0].getX() + 10, mPin[0].getY() + 10);
     path.lineTo(mPin[1].getX() + 10, mPin[1].getY() + 10);

     path.moveTo(mPin[1].getX() + 10, mPin[1].getY() + 10);
     path.lineTo(mPin[3].getX() + 10, mPin[3].getY() + 10);

     path.moveTo(mPin[3].getX() + 10, mPin[3].getY() + 10);
     path.lineTo(mPin[2].getX() + 10, mPin[2].getY() + 10);

     path.moveTo(mPin[2].getX() + 10, mPin[2].getY() + 10);
     path.lineTo(mPin[0].getX() + 10, mPin[0].getY() + 10);
     paint.setShader(new LinearGradient(0, 0, 0, getHeight(), Color.BLACK, Color.WHITE, Shader.TileMode.MIRROR));
     c.drawPath(path, paint);`

解决方案

You could fill the rect if you drew your line segments as a Path. But to just fill an area bounded by four unconnected but intersecting line segments, I think you'd have to write your own routine. Search for "flood fill" or "seed fill".

这篇关于OnDraw中填充形状canvas.drawLine创建的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！