Changeset 1065Tweet

Timestamp:

Nov 12, 2011, 6:08:43 PM (11 years ago)

Author:

sam

Message:

tutorial: clamp zoom values in the Mandelbrot viewer.

File:

• trunk/test/tutorial/tut03.cpp (modified) (5 diffs)

trunk/test/tutorial/tut03.cpp

@@ -58 +58 @@
         Ticker::Ref(m_mousetext);
 
+        m_zoomtext = new Text(NULL, "gfx/font/ascii.png");
+        m_zoomtext->SetPos(ivec3(5, m_size.y - 43, 1));
+        Ticker::Ref(m_zoomtext);
+
         position = ivec3(0, 0, 0);
         bbox[0] = position;
@@ -69 +73 @@
         Ticker::Unref(m_centertext);
         Ticker::Unref(m_mousetext);
+        Ticker::Unref(m_zoomtext);
         delete m_pixels;
     }
@@ -91 +96 @@
         {
             double zoom = pow(2.0, (buttons[0] ? -deltams : deltams) * 0.0015);
-            if (m_radius * zoom > 1.5)
-                zoom = 1.0;
+            if (m_radius * zoom > 8.0)
+                zoom = 8.0 / m_radius;
+            else if (m_radius * zoom < 1e-14)
+                zoom = 1e-14 / m_radius;
             m_radius *= zoom;
             m_center = (m_center - worldmouse) * zoom + worldmouse;
@@ -104 +111 @@
         sprintf(buf, " mouse: %+13.11f%+13.11fi", worldmouse.x, worldmouse.y);
         m_mousetext->SetText(buf);
+        sprintf(buf, "  zoom: %g", 1.0 / m_radius);
+        m_zoomtext->SetText(buf);
 
         u8vec4 *m_pixelstart = m_pixels + m_size.x * m_size.y / 4 * m_frame;
@@ -327 +336 @@
 
     /* Debug information */
-    Text *m_centertext, *m_mousetext;
+    Text *m_centertext, *m_mousetext, *m_zoomtext;
 };