Android Open Source - wannabe Pseudo Perspective

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License

The source code is released under:

MIT License

Java Source Code

// Copyright 2013 Patrick Forhan.
package wannabe.projection;
/*from w  w  w .  j  a va 2 s  .  c o m*/
import wannabe.Camera;
import wannabe.Position;
import wannabe.Rendered;
import wannabe.Voxel;

/**
 * Renders {@link Voxel}s with a simple perspective shift for height. The farther from the camera,
 * and the higher the Z value, the greater the shift. Higher Z values also get a larger size. A
 * Voxel at the same x and y position as the camera would only get a shift due to its height.
 *
 * This class doesn't calculate a real perspective offset. Instead, it adds a simple x and/or y
 * pixel offset for increasing distance from the camera. All voxels at the same Z height have the
 * same size.
 * TODO change that last bit; as x or y offset increase, z should decrease a bit.
 * TODO xDiff and yDiff are too drastic.
 */
public class PseudoPerspective implements Projection {
  private final Rendered rendered = new Rendered();

  @Override public Rendered render(Camera camera, Position position, int pixelSize) {
    // Determine distance from camera:
    int xDiff = camera.position.x - position.x;
    int yDiff = camera.position.y - position.y;
    int zDiff = camera.position.z - position.z;

    // Get the rough location to draw from:
    Position onScreen = camera.translate(position);
    rendered.size = pixelSize - zDiff;
    int halfSize = rendered.size >> 1; // TODO it's a shame I have to calculate this on every voxel
    rendered.left = pixelSize * onScreen.x - onScreen.z * xDiff + camera.uiPosition.left - halfSize;
    rendered.top = pixelSize * onScreen.y - onScreen.z * yDiff + camera.uiPosition.top - halfSize;

    return rendered;
  }
}

Java Source Code List

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