Changed patch spec

README.md

@@ -22,10 +22,7 @@ This program takes a JSON specification of environment to be traced. Currently o
  "Width": 400,
  "Height": 200,
  "Samples": 10,
- "IMin": 0,
- "IMax": 200,
- "JMin": 0,
- "JMax": 400
+ "Patch": [0, 200, 0, 400]
  },
  "Camera": {
  "LookFrom": [-2, 1, 0.5],
@@ -98,24 +95,25 @@ This program takes a JSON specification of environment to be traced. Currently o
   <td>Number of samples per pixel</td>
   </tr>
   <tr>
-  <td>IMin, IMax, JMin, JMax</td>
-  <td>integer</td>
-  <td>Defines specific patch of image to be rendered</td>
+  <td>Patch</td>
+  <td>list[int][4]</td>
+  <td>Defines specific patch of image to be rendered. Patch is defined as [x0, y0, x1, y1] and all points
+  (x, y) are considered given that x0 &le; x &lt; x1 and y0 &le; y &lt; y1 </td>
   </tr>
   <tr>
   <td rowspan="7">Camera</td>
   <td>LookFrom</td>
-  <td>list3</td>
+  <td>list[float][3]</td>
   <td>Coordinates of camera lens</td>
   </tr>
   <tr>
   <td>LookAt</td>
-  <td>list3</td>
+  <td>list[float][3]</td>
   <td>Coordinate of point where camera is pointed.</td>
   </tr>
   <tr>
   <td>UpVector</td>
-  <td>list3</td>
+  <td>list[float][3]</td>
   <td>Point defining direction of up direction for camera</td>
   </tr>
   <tr>
@@ -147,7 +145,7 @@ This program takes a JSON specification of environment to be traced. Currently o
   <tr>
   <td rowspan=3>Sphere</td>
   <td>Center</td>
-  <td>list3</td>
+  <td>list[float][3]</td>
   <td>Center of sphere</td>
   </tr>
   <tr>
@@ -168,7 +166,7 @@ This program takes a JSON specification of environment to be traced. Currently o
   </tr>
   <tr>
   <td>Albedo</td>
-  <td>list3</td>
+  <td>list[float][3]</td>
   <td>Albedo of Material</td>
   </tr>
   <tr>
@@ -184,7 +182,7 @@ This program takes a JSON specification of environment to be traced. Currently o
  </tbody>
 </table>
 
-**Note**: list3 => list of 3 float elements
+**Note**: list[x][n] => list of elements of type x with size n
 
 ## Usages
 ```bash

examples/fiveSpheres.json

@@ -9,10 +9,7 @@
  "Height": 400,
  "Width": 800,
  "Samples": 100,
- "IMin": 0,
- "IMax": 400,
- "JMin": 0,
- "JMax": 800
+ "Patch": [0, 400, 0, 800]
  },
  "Camera": {
  "LookFrom": [-2, 1, 0.5],

models/world.go

@@ -16,10 +16,11 @@ type ImageInput struct {
  Height int
  Width int
  Samples int
- IMin int
- IMax int
- JMin int
- JMax int
+ Patch [4]int
+}
+
+func (i *ImageInput) GetPatch() (int, int, int, int) {
+ return i.Patch[0], i.Patch[1], i.Patch[2], i.Patch[3]
 }
 
 type CameraInput struct {

sample_world.json

@@ -9,10 +9,7 @@
  "Width": 400,
  "Height": 200,
  "Samples": 10,
- "IMin": 0,
- "IMax": 200,
- "JMin": 0,
- "JMax": 400
+ "Patch": [0, 200, 0, 400]
  },
  "Camera": {
  "LookFrom": [-2, 1, 0.5],

tracer/tracer.go

@@ -37,8 +37,10 @@ func GoTrace(env *models.World, progress chan<- bool) {
  renderer := make(chan bool, renderRoutines)
  defer close(renderer)
 
- for i := env.Image.IMax - 1; i >= env.Image.IMin; i-- {
- for j := env.Image.JMin; j < env.Image.JMax; j++ {
+ imin, imax, jmin, jmax := env.Image.GetPatch()
+
+ for i := imax - 1; i >= imin; i-- {
+ for j := jmin; j < jmax; j++ {
  renderer <- true
  renderWg.Add(1)
  go func(i, j, samples int, camera *models.Camera, world *models.HitableList, pngImage *image.RGBA) {