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<title>click</title>
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<td width="173" valign="top" bgcolor="#DDDDDD"><p class="Normal"><a href="index.html">Home</a></p>
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<h1 class="Heading-1"><font color="#0000A0">Click Example</font></h1>
<div>
<p class="Normal"> This program displays a box (which automatically creates
a window referred to as <span class="attribute">scene</span>), then repeatedly
waits for a mouse left click, prints the mouse position in the Python shell window, and displays a
cyan sphere. A mouse click is defined as pressing and releasing the left
mouse button with no motion of the mouse, so the sphere appears when you release the mouse button.</p>
</div>
<div>
<p class="program"> from visual import *<br />
scene.range = 4<br />
box() # display a box for context<br />
while True:<br />
if scene.mouse.clicked:<br />
m = scene.mouse.getclick()<br />
loc = m.pos<br />
print loc<br />
sphere(pos=loc,
radius=0.2, color=color.cyan)</p>
<p class="Normal"> Copy this program into an IDLE window and run the program. Click outside the box and a cyan sphere appears where you click. If you click
inside the box, nothing seems to happen. This is because the mouse
click is in the xy plane, and the sphere is buried inside the box. If you rotate the scene and then click, you'll see that the
spheres go into the new plane parallel to the screen and passing
through <span class="attribute">scene.center</span>. If you want <em>all</em> of the
spheres to go into the xy plane, perpendicular to the z axis, change the latter part of the program like this:</p>
</div>
<div>
<p class="program"> loc =
m.project(normal=(0,0,1))<br />
# loc is None if no intersection with plane<br />
if loc:<br />
print loc<br />
sphere(pos=loc,
radius=0.2, color=color.cyan)</p>
</div>
<p class="Normal">Here is <a href="mouse.html">general mouse documentation</a>.</p>
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