100分重谢！哪位大神能解释一下Canvas中的drawvertices方法，各种参数看不懂啊。

[jiayangcg]

哪位大神能解释一下Canvas中的drawvertices方法，各种参数看不懂啊。

[jiayangcg]

void drawVertices(VertexMode mode, int vertexCount, float[] verts, int vertOffset,
            float[] texs, int texOffset, int[] colors, int colorOffset,
            short[] indices, int indexOffset, int indexCount, Paint paint)

[老科达]

 /**
     * Draw the array of vertices, interpreted as triangles (based on mode). The
     * verts array is required, and specifies the x,y pairs for each vertex. If
     * texs is non-null, then it is used to specify the coordinate in shader
     * coordinates to use at each vertex (the paint must have a shader in this
     * case). If there is no texs array, but there is a color array, then each
     * color is interpolated across its corresponding triangle in a gradient. If
     * both texs and colors arrays are present, then they behave as before, but
     * the resulting color at each pixels is the result of multiplying the
     * colors from the shader and the color-gradient together. The indices array
     * is optional, but if it is present, then it is used to specify the index
     * of each triangle, rather than just walking through the arrays in order.
     *
     * @param mode How to interpret the array of vertices
     * @param vertexCount The number of values in the vertices array (and
     *      corresponding texs and colors arrays if non-null). Each logical
     *      vertex is two values (x, y), vertexCount must be a multiple of 2.
     * @param verts Array of vertices for the mesh
     * @param vertOffset Number of values in the verts to skip before drawing.
     * @param texs May be null. If not null, specifies the coordinates to sample
     *      into the current shader (e.g. bitmap tile or gradient)
     * @param texOffset Number of values in texs to skip before drawing.
     * @param colors May be null. If not null, specifies a color for each
     *      vertex, to be interpolated across the triangle.
     * @param colorOffset Number of values in colors to skip before drawing.
     * @param indices If not null, array of indices to reference into the
     *      vertex (texs, colors) array.
     * @param indexCount number of entries in the indices array (if not null).
     * @param paint Specifies the shader to use if the texs array is non-null. 
     */

这个是顶点绘制法 我稍微扯下吧 VertexMode 顶点类型 比如他是三角形（连续3个顶点）或者 四边形 （连续4个顶点）等等 vertexCount 顶点数 总共有多少个顶点绘制。 verts[] 顶点数组 [0,0,0,1,1,0,...] 前面有xy 3组 如果是类型是三角形 他就构成一个三角形的绘制基元，往后类推。 vertOffset 顶点数据 起始位置 可能全部绘制，也可能只绘制部分顶点。与 vertexCount 配置使用 一般为0 texs[] 纹理数组 就是对图片等进行采样，然后去渲染顶点。（这个比较复杂，需要了解下 比如opengl渲染原理。） texOffset 同上offset 就是偏移量 colors[] 颜色数组 直接用颜色渲染顶点 colorOffset 同上offset 就是偏移量 indices[] 顶点索引 可能只绘制部分顶点 这个就是存放那些顶点的index ， 即verts[index] indexOffset 同上offset 就是偏移量 indexCount 绘制多少个索引点。 paint 这个只有 texs[] 不空 必须提供， 提供图片之类东西 采样。 更多的知识 你可以搜索下 图像渲染基础。