Examples of tripleplay.ui.util.Scale9

tripleplay.ui.util.Scale9.Axis
Facilitates the rendering of "scale-9" images, that is, images that are designed as a 3x3 grid such that each of the 9 pieces is fixed or stretched in one or both directions to fit a designated area. The corners are drawn without scaling, the top and bottom center pieces are scaled horizontally, the left and right center pieces are scaled vertically, and the center piece is scaled both horizontally and vertically.
By default, the cells are assumed to be of equal size (hence scale-9 image dimensions are normally a multiple of 3). By using {@link #xaxis} and {@link #yaxis}, this partitioning can be controlled directly.
Here's a diagram showing the stretching and axes, H = horizontally stretched, V = vertically stretched, U = unstretched.
```
 xaxis 0          1          2 --------------------------------- |          |          |          | 0  |    U     |    H     |    U     | |          |          |          | --------------------------------- |          |          |          | yaxis  1  |    V     |   H&V    |    V     | |          |          |          | --------------------------------- |          |          |          | 2  |    U     |    H     |    U     | |          |          |          | --------------------------------- 
```
Example 1: the horizontal middle of an image is a single pixel. This code will do that and automatically grow the left and right columns:
```
 Scale9 s9 = ...; s9.xaxis.resize(1, 1);
```
Example 2: there are no top and bottom rows. This code will stretch all of the image vertically, but keep the left and right third of the image fixed horizontally:
```
 Scale9 s9 = ...; s9.yaxis.resize(0, 0).resize(2, 0);
```

        if (!image.isReady()) {
            // complain about this, we don't support asynch images
            PlayN.log().warn("Scale9 image not preloaded: " + image);
        }
        _image = image;
        _s9 = new Scale9(image.width(), image.height());
    }

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    @Override
    protected Instance instantiate (final IDimension size) {
        return new LayerInstance(size, new ImmediateLayer.Renderer() {
            // The destination scale 9.
            Scale9 dest = new Scale9(size.width() / _destScale, size.height() / _destScale, _s9);
            public void render (Surface surf) {
                surf.save();
                surf.scale(_destScale, _destScale);
                if (alpha != null) surf.setAlpha(alpha);
                if (_tint != Tint.NOOP_TINT) surf.setTint(_tint);

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public class Scale9Test
{
    static float DELTA = (float)1e-7;


    @Test public void testAxis () {
        Axis axis = checkCoords(new Axis(1));
        assertEquals(1f/3, axis.size(0), DELTA);
        assertEquals(1-2f/3, axis.size(1), DELTA);
        assertEquals(1f/3, axis.size(2), DELTA);
    }

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        assertEquals(1-2f/3, axis.size(1), DELTA);
        assertEquals(1f/3, axis.size(2), DELTA);
    }


    @Test public void testAxisResize () {
        Axis axis1 = checkCoords(new Axis(1).resize(0, .25f).resize(2, .25f));
        Axis axis2 = checkCoords(new Axis(1).resize(1, .5f));
        for (Axis axis : new Axis[] {axis1, axis2}) {
            assertEquals(.25f, axis.size(0), DELTA);
            assertEquals(.5f, axis.size(1), DELTA);
            assertEquals(.25f, axis.size(2), DELTA);
        }

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            assertEquals(.25f, axis.size(2), DELTA);
        }
    }


    @Test public void testAxisDest () {
        Axis axis = checkCoords(new Axis(1, new Axis(1)));
        assertEquals(1f/3, axis.size(0), DELTA);
        assertEquals(1-2f/3, axis.size(1), DELTA);
        assertEquals(1f/3, axis.size(2), DELTA);


        axis = checkCoords(new Axis(2, new Axis(1)));
        assertEquals(1f/3, axis.size(0), DELTA);
        assertEquals(2-2f/3, axis.size(1), DELTA);
        assertEquals(1f/3, axis.size(2), DELTA);


        axis = checkCoords(new Axis(.5f, new Axis(1)));
        assertEquals(1f/3, axis.size(0), DELTA);
        assertEquals(.5-2f/3, axis.size(1), DELTA);
        assertEquals(1f/3, axis.size(2), DELTA);
    }

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        assertEquals(.5-2f/3, axis.size(1), DELTA);
        assertEquals(1f/3, axis.size(2), DELTA);
    }


    @Test public void testAxisClamp () {
        Axis axis = checkCoords(Scale9.clamp(new Axis(1), 1));
        assertEquals(1f/3, axis.size(0), DELTA);
        assertEquals(1-2f/3, axis.size(1), DELTA);
        assertEquals(1f/3, axis.size(2), DELTA);


        axis = checkCoords(Scale9.clamp(new Axis(2).resize(1, 1.5f), 1));
        assertEquals(.25f, axis.size(0), DELTA);
        assertEquals(.5f, axis.size(1), DELTA);
        assertEquals(.25f, axis.size(2), DELTA);


        axis = checkCoords(Scale9.clamp(new Axis(1), .5f));
        assertEquals(.25f, axis.size(0), DELTA);
        assertEquals(0, axis.size(1), DELTA);
        assertEquals(.25f, axis.size(2), DELTA);
    }

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Related Classes of tripleplay.ui.util.Scale9

tripleplay.ui.bgs.Scale9Background

tripleplay.ui.util.Scale9Test

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