What it's wrong in translation function ?

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Java

OpenGL

Hi, I tried to create and translate a polygon in openGL, I create a function for translation but this create a white line from x0 to v_size and I don't understand why ?

This is my function for polygon translation

What I have tried:

public void translate1(GL2 gl, double x0, double x1, double y0, double y1){
    double step = 0.2;
    for(double i = 0; i < v_size; i += step){
        gl.glBegin(GL2.GL_POLYGON);

            gl.glVertex2d(x0 + i, y0);
            gl.glVertex2d(x0 + i, y1);
            gl.glVertex2d(x1 + i, y1);
            gl.glVertex2d(x1 + i, y0);

        gl.glEnd();
    }
}

Initial x0 = 0, x1 = 10, y0 = 20, y1 = 30.

Thanks!