Refactor arc drawing

shader/twoD/arc.vert

@@ -1,15 +1,15 @@
 #version 430 core
 layout (location = 0) in vec3 position;
 layout (location = 1) in vec4 color;
-layout (location = 2) in vec4 saEaRadWdth;
+layout (location = 2) in vec3 boxXboxYwidth;
 out vec4 vColor;
-out vec4 vparams;
+out vec3 vparams;
 
 uniform mat4 worldMat;
 
 void main()
 {
-  gl_Position = vec4(position.xyz,1);
+  gl_Position = worldMat * vec4(position.xyz,1);
   vColor = color;
-  vparams = saEaRadWdth;
+  vparams = boxXboxYwidth;
 }