import java.util.Set;
import java.util.WeakHashMap;
+import static java.lang.Math.pow;
+import static java.lang.Math.sqrt;
+
public class GlowingPoint extends ForwardOrientedTexture {
- private static final int TEXTURE_SIZE = 50;
+ private static final int TEXTURE_RESOLUTION_PIXELS = 100;
+ /**
+ * A set of all existing glowing points.
+ * Used to reuse textures of glowing points of the same color.
+ */
private static final Set<GlowingPoint> glowingPoints = Collections.newSetFromMap(new WeakHashMap<>());
private final Color color;
public GlowingPoint(final Point3D point, final double pointSize,
final Color color) {
- super(point, pointSize, getTexture(color));
+ super(point, computeScale(pointSize), getTexture(color));
this.color = color;
synchronized (glowingPoints) {
}
}
+
+ private static double computeScale(double pointSize) {
+ return pointSize / ((double) (TEXTURE_RESOLUTION_PIXELS / 50f));
+ }
+
+ /**
+ * Returns a texture for a glowing point of the given color.
+ * The texture is a circle with a gradient from transparent to the given color.
+ */
private static Texture getTexture(final Color color) {
// attempt to reuse texture from existing glowing point of the same color
synchronized (glowingPoints) {
return createTexture(color);
}
+ /**
+ * Creates a texture for a glowing point of the given color.
+ * The texture is a circle with a gradient from transparent to the given color.
+ */
private static Texture createTexture(final Color color) {
- final Texture texture = new Texture(TEXTURE_SIZE, TEXTURE_SIZE, 1);
- for (int x = 0; x < TEXTURE_SIZE; x++)
- for (int y = 0; y < TEXTURE_SIZE; y++) {
+ final Texture texture = new Texture(TEXTURE_RESOLUTION_PIXELS, TEXTURE_RESOLUTION_PIXELS, 1);
+ int halfResolution = TEXTURE_RESOLUTION_PIXELS / 2;
+
+ for (int x = 0; x < TEXTURE_RESOLUTION_PIXELS; x++)
+ for (int y = 0; y < TEXTURE_RESOLUTION_PIXELS; y++) {
int address = texture.primaryBitmap.getAddress(x, y);
- final int distance = (int) Math
- .sqrt((((TEXTURE_SIZE / 2) - x) * ((TEXTURE_SIZE / 2) - x))
- + (((TEXTURE_SIZE / 2) - y) * ((TEXTURE_SIZE / 2) - y)));
+ final int distanceFromCenter = (int) sqrt(pow (halfResolution - x, 2) + pow (halfResolution - y, 2));
- int alpha = 255 - ((270 * distance) / (TEXTURE_SIZE / 2));
+ int alpha = 255 - ((270 * distanceFromCenter) / halfResolution);
if (alpha < 0)
alpha = 0;