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Camera to follow mouse drag

by Giorgio Bertolone · in Torque Game Builder · 02/21/2009 (9:02 am) · 3 replies

Hi guys,

any ideas on how to make the camera follow the mouse drag movement in an inverted way?

(Example: I drag left with mouse and the camera goes right)

Any help is very much appreciated.

Giorgio
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Torque 3D Owner Simon Jensen
SwiftThought Games
#1
02/23/2009 (9:53 am)
I'd make a sceneObject and have set its onUpdate callback to invert the posisiton of the mouse.

And then when you start the Drag mount the camera to the invisible object and then unmount it when you release the Drag.


Torque Owner Giorgio Bertolone
#2
02/27/2009 (4:04 am)
Thanks for the tip Simon!

Torque 3D Owner Gavin Beard
Byte Logic
#3
02/27/2009 (4:54 am)
Hi,

This may help you,
function sceneWindow2D::onMouseMove(%this, %modifier, %worldPosition, %clicks)
{
    %windowCoordinates = sceneWindow2D.getWindowPoint(%worldPosition);
    %x = getWord(%windowCoordinates, 0);
    %y = getWord(%windowCoordinates, 1);
    %worldX = getWord(%worldPosition, 0);
    %worldY = getWord(%worldPosition, 1);
    
    if(%x <= 50 || %x >= 750 || %y <= 50 || %y >= 550) 
    {
        %vec = t2dVectorSub(%worldPosition, cameraHolder.getPosition());
        %angle = -mRadToDeg(mATan(getWord(%vec,0),getWord(%vec,1)));
        cameraHolder.setLinearVelocityPolar(%angle, -30);
    }
    
    else
        cameraHolder.setLinearVelocityPolar(cameraHolder.getRotation(), 0);
}
This relies on having the camera mounted to another object, (I used a 12x12 transparent image) then in the above code replace the cameraHolder with the name of the transparent object.

hope it helps

FYI, the above code checks and only moves the camera if the mouse is within 50px of the edge of the window:
if(%x <= 50 || %x >= 750 || %y <= 50 || %y >= 550)

this is based on a resolution of 800x600 so can be adjusted accordingly.

Also you can use

sceneWindow2D::onMouseDragged(%this, %modifier, %worldPosition, %clicks)

to only move if left mouse button is held down.