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examples/rectangle-mover/gesture.c

 

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#include <math.h>

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#include <stdlib.h>

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#include <string.h>

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#include <signal.h>

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        case GRIP_GESTURE_PINCH:

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          {

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            GripEventGesturePinch *e = (GripEventGesturePinch *)event;

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            scale += e->radius_delta / 100;

 

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            GtkWindow *toplevel = (GtkWindow *)gtk_widget_get_toplevel (widget);

 

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            gint window_width, window_height;

 

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            AxisExtents *x = grip_input_device_get_x_extents (e->input_device);

 

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            AxisExtents *y = grip_input_device_get_y_extents (e->input_device);

 

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            gfloat width = 0;

 

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            gfloat height = 0;

 

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            gfloat factor = 0;

 

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            gtk_window_get_size (toplevel, &window_width, &window_height);

 

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            width = window_width / (x->maximum - x->minimum);

 

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            height = window_height / (y->maximum - y->minimum);

 

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            factor = sqrtf (width * width + height * height) / 5.2723;

 

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            scale += e->radius_delta * factor;

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          }

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          break;

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