Unity's screen drawing line

Using Unityengine;
Using System.Collections;

public class Drawrectangle:monobehaviour {

Public Color rectcolor = Color.green;

Private Material Rectmat = null;//Draw line material does not set the system will be the current material draw line results are not controllable

Use this for initialization

void Start () {

Rectmat = new Material ("Shader \" lines/colored blended\ "{" +

"Subshader {Pass {" +

"Blend srcalpha Oneminussrcalpha" +

"Zwrite off cull off Fog {Mode off}" +

"Bindchannels {" +

"Bind \" vertex\ ", vertex bind \" color\ ", color}" +

"}}}");//Create a drawing line material

Rectmat.hideflags = Hideflags.hideanddontsave;

RectMat.shader.hideFlags = Hideflags.hideanddontsave;

}


void Update () {
}



void Onpostrender () {//Draw line This operation is recommended in Onpostrender () rather than directly on update, so a flag is required to open

Rect rect0 = new rect (0,0,0,0);

DrawRect (RECT0);

}

void DrawRect (Rect rect0) {
if (! Rectmat)
Return
Gl. Pushmatrix ();//Save Camera Transform matrix
Rectmat.setpass (0);

Gl. Loadpixelmatrix ();//set to draw with screen coordinates

Gl. Begin (GL. QUADS);

Gl. Color (new color (rectcolor.r,rectcolor.g,rectcolor.b,0.1f));//Set color and transparency, transparent inside the box

Gl. Vertex3 (0,0,0);

Gl. Vertex3 (screen.width/2,0,0);

Gl. Vertex3 (screen.width/2,screen.height/2,0);

Gl. Vertex3 (0,screen.height/2,0);

Gl. End ();
float StartX = rect0.x;
float starty = rect0.y;
float endx = Rect0.xmax;
float EndY = Rect0.ymax;

GL. Begin (GL. LINES);

GL. Color (rectcolor);//Set box border color border opaque

GL. Vertex3 (startx,starty,0);
GL. Vertex3 (endx,starty,0);

GL. Vertex3 (endx,starty,0);
GL. Vertex3 (endx,endy,0);

GL. Vertex3 (endx,endy,0);
GL. Vertex3 (startx,endy,0);

GL. Vertex3 (startx,endy,0);
GL. Vertex3 (startx,starty,0);

GL. End ();
//GL. Begin (GL. LINES);
//GL. Vertex3 (0, 0, 0);
//GL. Vertex3 (screen.width, screen.height, 0);
//GL. End ();
GL. Popmatrix ();//restore Camera projection matrix
}

void Drawrects (rect[] rects) {
if (! Rectmat)
Return
Gl. Pushmatrix ();//Save Camera Transform matrix
Rectmat.setpass (0);

Gl. Loadpixelmatrix ();//set to draw with screen coordinates

Gl. Begin (GL. QUADS);

Gl. Color (new color (rectcolor.r,rectcolor.g,rectcolor.b,0.1f));//Set color and transparency, transparent inside the box

Gl. Vertex3 (0,0,0);

Gl. Vertex3 (screen.width/2,0,0);

Gl. Vertex3 (screen.width/2,screen.height/2,0);

Gl. Vertex3 (0,screen.height/2,0);

Gl. End ();
Gl. Begin (GL. LINES);
for (int i = 0; i < rects. Length; i++) {

Rect rect0 = rects[i];
Debug.Log (RECT0);
float StartX = rect0.x;
float starty = rect0.y;
float endx = Rect0.xmax;
float EndY = Rect0.ymax;

Gl. Color (rectcolor);//Set box border color border opaque

Gl. Vertex3 (startx,starty,0);
Gl. Vertex3 (endx,starty,0);

Gl. Vertex3 (endx,starty,0);
Gl. Vertex3 (endx,endy,0);

Gl. Vertex3 (endx,endy,0);
Gl. Vertex3 (startx,endy,0);

Gl. Vertex3 (startx,endy,0);
Gl. Vertex3 (startx,starty,0);


}
Gl. End ();
Gl. Begin (GL. LINES);
Gl. Vertex3 (0, 0, 0);
Gl. Vertex3 (screen.width, screen.height, 0);
Gl. End ();
Gl. Popmatrix ();//Recover Camera projection matrix

}
}

Unity's screen drawing line