Opengl es 如何使用OpenGL ES 1绘制虚线？

要在OpenGL中绘制虚线，我可以使用GllineStiple，但如何在OpenGL ES 1中实现相同的效果？

线条可以像三角形一样进行纹理处理。启用alpha测试，应用alpha纹理，设置一些纹理坐标，然后欣赏。

事实上，我已经意识到圆点线或虚线用于循环，但将其用作绘图方法的线型链接仍然毫无意义，下面是我的圆点线和虚线的代码：

glPushAttrib(GL_ENABLE_BIT); 
# glPushAttrib is done to return everything to normal after drawing

glLineStipple(1, 0xAAAA);  # [1]
glEnable(GL_LINE_STIPPLE);
glBegin(GL_LINES);
glVertex3f(-.5,.5,-.5);
glVertex3f(.5,.5,-.5);
glEnd();

glPopAttrib();

圆点线：

(void)drawVerticalDotedInternalGrid{
    float a,b;
    int drawCount =0;
    GLfloat dotedInternalGrid[1296];

    for (a = -0.5f; a <= 0.5f; a +=0.5f) {
        for (b = -0.875f; b <=0.925f; b += 0.025f) 
        {           
            dotedInternalGrid[drawCount] = b;
            drawCount++;
            dotedInternalGrid[drawCount] = a;
            drawCount++;
        };      
    };
    glPointSize(1.0f);
    glColor4f(0.863f,0.863f,0.863f,0.8f); //line color
    glVertexPointer(2, GL_FLOAT, 0, dotedInternalGrid);
    glEnableClientState(GL_VERTEX_ARRAY);   
    glDrawArrays(GL_POINTS, 0, 648);        
    glDisableClientState(GL_VERTEX_ARRAY);
}

（无效）drawVerticalDotedInternalGrid{
浮子a、b；
int drawCount=0；
GLfloat点式内部网格[1296]；
为了便于解释（a=-0.5f；a，我将drawHorizontalDashedLine（）放在第一位

要理解，请单击此图像。
因为我的名声，我不能在这篇文章上贴图片。

+（void）绘图水平虚线：（GLfloat）x1 x2：（GLfloat）x2 y：（GLfloat）y{
//参数
GLfloat破折号长度=4.0f；
GLfloat间隙长度=2.0f；
GLfloat LINE_厚度=1.5f；
//计算绘制整条直线需要多少虚线
GLF水平长度=fabsf（x2-x1）；
int nDashedLineCount=f横向长度/（短划线长度+间隙长度）；
int nVerticesSize=nDashedLineCount*4；//虚线有4个值（2个点）
//顶点
GLfloat顶点[重新认证]；
//第一条虚线表示顶点
顶点[0]=（x1

drawDashedLine（）

我用三角函数来计算长度

+(void)drawDashedLine:(CGPoint)point1 point2:(CGPoint)point2 {

    //Parameters
    GLfloat DASH_LENGTH = 3.0f;
    GLfloat GAP_LENGTH = 1.0f;
    GLfloat LINE_THICKNESS = 1.5f;

    //Calculate how many dashes require to draw the whole line
    GLfloat fWidth = point2.x - point1.x;
    GLfloat fHeight = point2.y - point1.y;
    GLfloat fRadian = atan2(fHeight, fWidth);

    float fLineLength = sqrtf(powf(fWidth, 2) + powf(fHeight, 2));
    int nDashedLineCount = fabsf(fLineLength / (DASH_LENGTH + GAP_LENGTH));
    int nVerticesSize = nDashedLineCount * 4; //A dashed line has 4 values(2 points)

    //Vertex
    GLfloat vertices[nVerticesSize];

    //The first dashed line vertices
    vertices[0] = point1.x;
    vertices[1] = point1.y;
    vertices[2] = point1.x + cosf(fRadian) * DASH_LENGTH;
    vertices[3] = point1.y + sinf(fRadian) * DASH_LENGTH;

    //The other vertices of dashed lines
    for (int nIndex=4; nIndex < nVerticesSize; nIndex=nIndex+4) {
        vertices[nIndex]   = vertices[nIndex-2] + cosf(fRadian) * GAP_LENGTH;
        vertices[nIndex+1] = vertices[nIndex-1] + sinf(fRadian) * GAP_LENGTH;
        vertices[nIndex+2] = vertices[nIndex]   + cosf(fRadian) * DASH_LENGTH;
        vertices[nIndex+3] = vertices[nIndex+1] + sinf(fRadian) * DASH_LENGTH;

        //NSLog(@"DrawDash Point1(%.2f, %.2f)", vertices[nIndex], vertices[nIndex+1]);
        //NSLog(@"DrawDash Point2(%.2f, %.2f)", vertices[nIndex+2], vertices[nIndex+3]);
    }

    //Draw the arrays
    glPushMatrix();
    glLineWidth(LINE_THICKNESS);
    glVertexPointer (2, GL_FLOAT, 0, vertices);
    glDrawArrays (GL_LINES, 0, nVerticesSize/2);
    glPopMatrix();
}

+（void）drawDashedLine:（CGPoint）点1点2:（CGPoint）点2{
//参数
GLfloat破折号长度=3.0f；
GLfloat间隙长度=1.0f；
GLfloat LINE_厚度=1.5f；
//计算绘制整条直线需要多少虚线
GLfloat fWidth=点2.x-点1.x；
GLfloat FHHEIGHT=点2.y-点1.y；
GLfloat fRadian=atan2（高度，宽度）；
浮子长度=sqrtf（功率（宽度，2）+功率（高度，2））；
int nDashedLineCount=fabsf（长度/（短划线长度+间隙长度））；
int nVerticesSize=nDashedLineCount*4；//虚线有4个值（2个点）
//顶点
GLfloat顶点[重新认证]；
//第一条虚线表示顶点
顶点[0]=点1.x；
顶点[1]=点1.y；
顶点[2]=点1.x+cosf（fRadian）*破折号长度；
顶点[3]=点1.y+sinf（fRadian）*破折号长度；
//虚线的其他顶点
对于（int nIndex=4；nIndex
这看起来像是一段复制粘贴的代码，可能来自
+(void)drawHorizontalDashedLine:(GLfloat)x1 x2:(GLfloat)x2 y:(GLfloat)y {

    //Parameters
    GLfloat DASH_LENGTH = 4.0f;
    GLfloat GAP_LENGTH = 2.0f;
    GLfloat LINE_THICKNESS = 1.5f;

    //Calculate how many dashes require to draw the whole line
    GLfloat fHorizontalLength = fabsf(x2-x1);
    int nDashedLineCount = fHorizontalLength / (DASH_LENGTH + GAP_LENGTH);
    int nVerticesSize = nDashedLineCount * 4; //A dashed line has 4 values(2 points)

    //Vertex
    GLfloat vertices[nVerticesSize];

    //The first dashed line vertices
    vertices[0] = (x1 < x2)? x1 : x2;
    vertices[1] = y;
    vertices[2] = (x1 < x2)? x1 : x2 + DASH_LENGTH;
    vertices[3] = y;

    //The other vertices of dashed lines
    for (int nIndex=4; nIndex < nVerticesSize; nIndex=nIndex+4) {
        vertices[nIndex]   = vertices[nIndex-2] + GAP_LENGTH;
        vertices[nIndex+1] = y;
        vertices[nIndex+2] = vertices[nIndex] + DASH_LENGTH;
        vertices[nIndex+3] = y;

        //NSLog(@"Point1(%.2f, %.2f)", vertices[nIndex], vertices[nIndex+1]);
        //NSLog(@"Point2(%.2f, %.2f)", vertices[nIndex+2], vertices[nIndex+3]);
    }

    //Draw the arrays
    glPushMatrix();
    glLineWidth(LINE_THICKNESS);
    glVertexPointer (2, GL_FLOAT, 0, vertices);
    glDrawArrays (GL_LINES, 0, nVerticesSize/2);
    glPopMatrix();
}

+(void)drawDashedLine:(CGPoint)point1 point2:(CGPoint)point2 {

    //Parameters
    GLfloat DASH_LENGTH = 3.0f;
    GLfloat GAP_LENGTH = 1.0f;
    GLfloat LINE_THICKNESS = 1.5f;

    //Calculate how many dashes require to draw the whole line
    GLfloat fWidth = point2.x - point1.x;
    GLfloat fHeight = point2.y - point1.y;
    GLfloat fRadian = atan2(fHeight, fWidth);

    float fLineLength = sqrtf(powf(fWidth, 2) + powf(fHeight, 2));
    int nDashedLineCount = fabsf(fLineLength / (DASH_LENGTH + GAP_LENGTH));
    int nVerticesSize = nDashedLineCount * 4; //A dashed line has 4 values(2 points)

    //Vertex
    GLfloat vertices[nVerticesSize];

    //The first dashed line vertices
    vertices[0] = point1.x;
    vertices[1] = point1.y;
    vertices[2] = point1.x + cosf(fRadian) * DASH_LENGTH;
    vertices[3] = point1.y + sinf(fRadian) * DASH_LENGTH;

    //The other vertices of dashed lines
    for (int nIndex=4; nIndex < nVerticesSize; nIndex=nIndex+4) {
        vertices[nIndex]   = vertices[nIndex-2] + cosf(fRadian) * GAP_LENGTH;
        vertices[nIndex+1] = vertices[nIndex-1] + sinf(fRadian) * GAP_LENGTH;
        vertices[nIndex+2] = vertices[nIndex]   + cosf(fRadian) * DASH_LENGTH;
        vertices[nIndex+3] = vertices[nIndex+1] + sinf(fRadian) * DASH_LENGTH;

        //NSLog(@"DrawDash Point1(%.2f, %.2f)", vertices[nIndex], vertices[nIndex+1]);
        //NSLog(@"DrawDash Point2(%.2f, %.2f)", vertices[nIndex+2], vertices[nIndex+3]);
    }

    //Draw the arrays
    glPushMatrix();
    glLineWidth(LINE_THICKNESS);
    glVertexPointer (2, GL_FLOAT, 0, vertices);
    glDrawArrays (GL_LINES, 0, nVerticesSize/2);
    glPopMatrix();
}