Add simplistic blueprint background.

app/src/main/java/com/codigoparallevar/minicards/DrawView.java

@@ -21,13 +21,15 @@ class DrawView extends View {
 
     public DrawView(Context context) {
         super(context);
-        paint.setColor(Color.RED);
+        this.setBackgroundColor(Color.rgb(4, 69, 99));
         parts.add(new RoundButton(500, 1200, 80, 100));
     }
 
     @Override
     public void onDraw(Canvas canvas){
         long time = System.currentTimeMillis();
+        drawBackground(canvas);
+
         for (Part part : parts){
             part.draw(canvas);
         }
@@ -35,6 +37,26 @@ class DrawView extends View {
         Log.d("Render time", System.currentTimeMillis() - time + "ms");
     }
 
+    private void drawBackground(Canvas canvas) {
+        // Blueprint background
+        final int width = getWidth() + getLeft();
+        final int height = getHeight() + getTop();
+        final int cellSize = 50;
+
+        Paint blueprintLines = new Paint(Paint.ANTI_ALIAS_FLAG);
+        blueprintLines.setColor(Color.argb(100, 255, 255, 255));
+
+        // Vertical lines
+        for (int x = cellSize; x < width; x += cellSize){
+            canvas.drawLine(x, 0, x, height, blueprintLines);
+        }
+
+        // Horizontal lines
+        for (int y = cellSize; y < height; y += cellSize){
+            canvas.drawLine(0, y, width, y, blueprintLines);
+        }
+    }
+
     @Override
     public boolean onTouchEvent(MotionEvent event){
         int x = (int) event.getX() - this.getLeft();

app/src/main/java/com/codigoparallevar/minicards/TestActivity.java

@@ -14,7 +14,6 @@ public class TestActivity extends AppCompatActivity {
         super.onCreate(savedInstanceState);
 
         drawView = new DrawView(this);
-        drawView.setBackgroundColor(Color.BLACK);
         setContentView(drawView);
     }