Implement label scaling.

Author: EMaksymenko

worldwind/src/main/java/gov/nasa/worldwind/shape/Label.java

@@ -445,10 +445,11 @@ protected void makeDrawable(RenderContext rc) {
         // origin at the text's bottom-left corner and axes that extend up and to the right from the origin point.
         int w = texture.getWidth();
         int h = texture.getHeight();
+        double s = this.activeAttributes.scale;
         this.activeAttributes.textOffset.offsetForSize(w, h, renderData.offset);
         renderData.unitSquareTransform.setTranslation(
-            renderData.screenPlacePoint.x - renderData.offset.x,
-            renderData.screenPlacePoint.y - renderData.offset.y,
+            renderData.screenPlacePoint.x - renderData.offset.x * s,
+            renderData.screenPlacePoint.y - renderData.offset.y * s,
             renderData.screenPlacePoint.z);
 
         // Apply the label's rotation according to its rotation value and orientation mode. The rotation is applied
@@ -462,7 +463,7 @@ protected void makeDrawable(RenderContext rc) {
         }
 
         // Apply the label's translation and scale according to its text size.
-        renderData.unitSquareTransform.multiplyByScale(w, h, 1);
+        renderData.unitSquareTransform.multiplyByScale(w * s, h * s, 1);
 
         WWMath.boundingRectForUnitSquare(renderData.unitSquareTransform, renderData.screenBounds);
         if (!rc.frustum.intersectsViewport(renderData.screenBounds)) {

worldwind/src/main/java/gov/nasa/worldwind/shape/Placemark.java

@@ -840,16 +840,22 @@ protected void doRender(RenderContext rc) {
             }
 
             if (this.labelTexture != null) {
+                // Compute an camera-position proximity scaling factor, so that distant placemarks can be scaled smaller than
+                // nearer placemarks.
+                visibilityScale = this.isEyeDistanceScaling() ?
+                        Math.max(this.activeAttributes.minimumImageScale, Math.min(1, this.getEyeDistanceScalingLabelThreshold() / this.cameraDistance)) : 1;
+
                 int w = this.labelTexture.getWidth();
                 int h = this.labelTexture.getHeight();
+                double s = this.activeAttributes.labelAttributes.scale * visibilityScale;
                 this.activeAttributes.labelAttributes.textOffset.offsetForSize(w, h, offset);
 
                 labelTransform.setTranslation(
-                        screenPlacePoint.x - offset.x,
-                        screenPlacePoint.y - offset.y,
+                        screenPlacePoint.x - offset.x * s,
+                        screenPlacePoint.y - offset.y * s,
                         screenPlacePoint.z);
 
-                labelTransform.setScale(w, h, 1);
+                labelTransform.setScale(w * s, h * s, 1);
 
                 WWMath.boundingRectForUnitSquare(labelTransform, labelBounds);
                 if (rc.frustum.intersectsViewport(labelBounds)) {

worldwind/src/main/java/gov/nasa/worldwind/shape/TextAttributes.java

@@ -32,6 +32,8 @@ public class TextAttributes {
 
     protected float outlineWidth;
 
+    protected double scale;
+
     public TextAttributes() {
         this.textColor = new Color(1, 1, 1, 1);
         this.textOffset = Offset.bottomCenter();
@@ -41,6 +43,7 @@ public TextAttributes() {
         this.outlineColor = new Color(0, 0, 0, 1);
         this.enableDepthTest = true;
         this.outlineWidth = 3;
+        this.scale = 1;
     }
 
     public TextAttributes(TextAttributes attributes) {
@@ -57,6 +60,7 @@ public TextAttributes(TextAttributes attributes) {
         this.enableOutline = attributes.enableOutline;
         this.enableDepthTest = attributes.enableDepthTest;
         this.outlineWidth = attributes.outlineWidth;
+        this.scale = attributes.scale;
     }
 
     public TextAttributes set(TextAttributes attributes) {
@@ -73,6 +77,7 @@ public TextAttributes set(TextAttributes attributes) {
         this.outlineColor.set(attributes.outlineColor);
         this.enableDepthTest = attributes.enableDepthTest;
         this.outlineWidth = attributes.outlineWidth;
+        this.scale = attributes.scale;
 
         return this;
     }
@@ -94,7 +99,8 @@ public boolean equals(Object o) {
             && this.enableOutline == that.enableOutline
             && this.outlineColor.equals(that.outlineColor)
             && this.enableDepthTest == that.enableDepthTest
-            && this.outlineWidth == that.outlineWidth;
+            && this.outlineWidth == that.outlineWidth
+            && this.scale == that.scale;
     }
 
     @Override
@@ -107,6 +113,8 @@ public int hashCode() {
         result = 31 * result + this.outlineColor.hashCode();
         result = 31 * result + (this.enableDepthTest ? 1 : 0);
         result = 31 * result + (this.outlineWidth != +0.0f ? Float.floatToIntBits(this.outlineWidth) : 0);
+        long temp = Double.doubleToLongBits(this.scale);
+        result = 31 * result + (int) (temp ^ (temp >>> 32));
         return result;
     }
 
@@ -196,4 +204,13 @@ public TextAttributes setOutlineWidth(float lineWidth) {
         this.outlineWidth = lineWidth;
         return this;
     }
+
+    public double getScale() {
+        return this.scale;
+    }
+
+    public TextAttributes setScale(double scale) {
+        this.scale = scale;
+        return this;
+    }
 }