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Implement missed Placemark label functionality.
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@ComBatVision
ComBatVision committed Mar 30, 2022
1 parent 49080c0 commit 9377485
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Showing 4 changed files with 159 additions and 89 deletions.
5 changes: 5 additions & 0 deletions worldwind-examples/src/main/java/gov/nasa/worldwindx/PlacemarksDemoActivity.java
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,8 @@
import gov.nasa.worldwind.BasicWorldWindowController;
import gov.nasa.worldwind.PickedObject;
import gov.nasa.worldwind.PickedObjectList;
import gov.nasa.worldwind.WorldWind;
import gov.nasa.worldwind.geom.Offset;
import gov.nasa.worldwind.geom.Position;
import gov.nasa.worldwind.layer.RenderableLayer;
import gov.nasa.worldwind.render.ImageSource;
Expand Down Expand Up @@ -273,6 +275,7 @@ protected static PlacemarkAttributes createPlacemarkAttributes(Resources resourc
//IconBitmapFactory factory = new IconBitmapFactory(resources, resourceId);
//placemarkAttributes.setImageSource(ImageSource.fromBitmapFactory(factory)).setImageScale(scale);
placemarkAttributes.setImageSource(ImageSource.fromResource(resourceId)).setImageScale(scale).setMinimumImageScale(0.5);
placemarkAttributes.getLabelAttributes().setTextOffset(new Offset(WorldWind.OFFSET_PIXELS, -24, WorldWind.OFFSET_FRACTION, 0.0));
return placemarkAttributes;
}
}
Expand Down Expand Up @@ -560,6 +563,8 @@ private void createPlaceIcons() {
placemark.setLevelOfDetailSelector(new PlaceLevelOfDetailSelector(getResources(), place));
placemark.setEyeDistanceScaling(true);
placemark.setEyeDistanceScalingThreshold(PlaceLevelOfDetailSelector.LEVEL_1_DISTANCE);
placemark.setLabel(place.name);
placemark.setAltitudeMode(WorldWind.CLAMP_TO_GROUND);

// On a background thread, we can add Placemarks to a RenderableLayer that is
// NOT attached to the WorldWindow. If the layer was attached to the WorldWindow
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2 changes: 1 addition & 1 deletion worldwind/src/main/java/gov/nasa/worldwind/render/RenderContext.java
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Original file line number Diff line number Diff line change
Expand Up @@ -432,7 +432,7 @@ public Texture getText(String text, TextAttributes attributes) {
}

public Texture renderText(String text, TextAttributes attributes) {
TextCacheKey key = new TextCacheKey().set(text, attributes);
TextCacheKey key = this.scratchTextCacheKey.set(text, attributes);
Texture texture = null;

if (text != null && attributes != null) {
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239 changes: 152 additions & 87 deletions worldwind/src/main/java/gov/nasa/worldwind/shape/Placemark.java
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Original file line number Diff line number Diff line change
Expand Up @@ -62,17 +62,21 @@ public interface LevelOfDetailSelector {

protected static final double DEFAULT_DEPTH_OFFSET = -0.03;

private static Vec3 placePoint = new Vec3();
private static final Vec3 placePoint = new Vec3();

private static Vec3 screenPlacePoint = new Vec3();
private static final Vec3 screenPlacePoint = new Vec3();

private static Vec3 groundPoint = new Vec3();
private static final Vec3 groundPoint = new Vec3();

private static Vec2 offset = new Vec2();
private static final Vec2 offset = new Vec2();

private static Matrix4 unitSquareTransform = new Matrix4();
private static final Matrix4 imageTransform = new Matrix4();

private static Viewport screenBounds = new Viewport();
private static final Matrix4 labelTransform = new Matrix4();

private static final Viewport imageBounds = new Viewport();

private static final Viewport labelBounds = new Viewport();

/**
* The placemark's geographic position.
Expand Down Expand Up @@ -105,6 +109,11 @@ public interface LevelOfDetailSelector {
*/
protected Texture activeTexture;

/**
* The texture associated with the label attributes, or null if the attributes specify no image.
*/
protected Texture labelTexture;

/**
* The picked object ID associated with the placemark during the current render pass.
*/
Expand All @@ -115,8 +124,7 @@ public interface LevelOfDetailSelector {
/**
* The label text to draw near the placemark.
*/
// TODO: implement label property
// protected String label;
protected String label;

/**
* Determines whether the normal or highlighted attibutes should be used.
Expand Down Expand Up @@ -210,7 +218,7 @@ public Placemark(Position position, PlacemarkAttributes attributes, String name)
this.setPosition(position);
this.setAltitudeMode(WorldWind.ABSOLUTE);
this.setDisplayName(name == null || name.isEmpty() ? "Placemark" : name);
// this.setLabel(name); // TODO: call setLabel(name)
// this.setLabel(name); // Do not use display name as label by default
this.attributes = attributes;
this.eyeDistanceScaling = false;
this.eyeDistanceScalingThreshold = DEFAULT_EYE_DISTANCE_SCALING_THRESHOLD;
Expand Down Expand Up @@ -257,10 +265,9 @@ public static Placemark createWithImage(Position position, ImageSource imageSour
*
* @return A new Placemark with a PlacemarkAttributes bundle containing TextAttributes.
*/
// TODO: implement createWithImageAndLabel factory method
// public static Placemark createWithImageAndLabel(Position position, ImageSource imageSource, String label) {
// return new Placemark(position, PlacemarkAttributes.createWithImage(imageSource), label);
// }
public static Placemark createWithImageAndLabel(Position position, ImageSource imageSource, String label) {
return new Placemark(position, PlacemarkAttributes.createWithImage(imageSource), label);
}

/**
* Gets this placemark's geographic position.
Expand Down Expand Up @@ -385,15 +392,15 @@ public Placemark setLevelOfDetailSelector(LevelOfDetailSelector levelOfDetailSel
this.levelOfDetailSelector = levelOfDetailSelector;
return this;
}
/**

/*
* Gets the text used to label this placemark on the globe.
*
* @return The text used to label a placemark on the globe when labels are enabled
*/
// TODO: implement getLabel()
// public String getLabel() {
// return label;
// }
public String getLabel() {
return label;
}

/**
* Sets the text used for this placemark's label on the globe.
Expand All @@ -402,11 +409,10 @@ public Placemark setLevelOfDetailSelector(LevelOfDetailSelector levelOfDetailSel
*
* @return This placemark
*/
// TODO: implement setLabel()
// public Placemark setLabel(String label) {
// this.label = label;
// return this;
// }
public Placemark setLabel(String label) {
this.label = label;
return this;
}

/**
* Indicates whether this placemark's size is reduced at higher eye distances. If true, this placemark's size is
Expand Down Expand Up @@ -749,61 +755,13 @@ protected void doRender(RenderContext rc) {
// Compute the placemark icon's active texture.
this.determineActiveTexture(rc);

// If the placemark's icon is visible, enqueue a drawable icon for processing on the OpenGL thread.
WWMath.boundingRectForUnitSquare(unitSquareTransform, screenBounds);
if (rc.frustum.intersectsViewport(screenBounds)) {
Pool<DrawableScreenTexture> pool = rc.getDrawablePool(DrawableScreenTexture.class);
DrawableScreenTexture drawable = DrawableScreenTexture.obtain(pool);
this.prepareDrawableIcon(rc, drawable);
rc.offerShapeDrawable(drawable, this.cameraDistance);
}

// Release references to objects stored in the render resource cache.
this.activeTexture = null;

// Enqueue a picked object that associates the placemark's icon and leader with its picked object ID.
if (rc.pickMode && rc.drawableCount() != drawableCount) {
rc.offerPickedObject(PickedObject.fromRenderable(this.pickedObjectId, this, rc.currentLayer));
}
}

/**
* Determines the placemark attributes to use for the current render pass.
*
* @param rc the current render context
*/
protected void determineActiveAttributes(RenderContext rc) {
if (this.highlighted && this.highlightAttributes != null) {
this.activeAttributes = this.highlightAttributes;
} else {
this.activeAttributes = this.attributes;
}
}

/**
* Determines the image texture and unit square transform to use for the current render pass.
*
* @param rc the current render context
*/
protected void determineActiveTexture(RenderContext rc) {
// TODO: Refactor!
if (this.activeAttributes.imageSource != null) {
// Earlier in doRender(), an attempt was made to 'get' the activeTexture from the cache.
// If was not found in the cache we need to retrieve a texture from the image source.
if (this.activeTexture == null) {
this.activeTexture = rc.retrieveTexture(this.activeAttributes.imageSource, null); // puts retrieved textures in the cache
}
} else {
this.activeTexture = null; // there is no imageSource; draw a simple colored square
}

// Compute an camera-position proximity scaling factor, so that distant placemarks can be scaled smaller than
// nearer placemarks.
double visibilityScale = this.isEyeDistanceScaling() ?
Math.max(this.activeAttributes.minimumImageScale, Math.min(1, this.getEyeDistanceScalingThreshold() / this.cameraDistance)) : 1;

// Initialize the unit square transform to the identity matrix.
unitSquareTransform.setToIdentity();
imageTransform.setToIdentity();

// Apply the icon's translation and scale according to the image size, image offset and image scale. The image
// offset is defined with its origin at the image's bottom-left corner and axes that extend up and to the right
Expand Down Expand Up @@ -831,34 +789,113 @@ protected void determineActiveTexture(RenderContext rc) {
}

// Position image on screen
unitSquareTransform.multiplyByTranslation(
imageTransform.multiplyByTranslation(
screenPlacePoint.x,
screenPlacePoint.y,
screenPlacePoint.z);

// Divide Z by 2^24 to prevent texture clipping when tilting (where 24 is depth buffer bit size).
// Doing so will limit depth range to (diagonal length)/2^24 and make its value within 0..1 range.
unitSquareTransform.multiplyByScale(1, 1, 1d / (1 << 24) );
imageTransform.multiplyByScale(1, 1, 1d / (1 << 24) );

// Perform the tilt so that the image tilts back from its base into the view volume
if (this.imageTilt != 0) {
double tilt = this.imageTiltReference == WorldWind.RELATIVE_TO_GLOBE ?
double actualTilt = this.imageTiltReference == WorldWind.RELATIVE_TO_GLOBE ?
rc.camera.tilt + this.imageTilt : this.imageTilt;
unitSquareTransform.multiplyByRotation(-1, 0, 0, tilt);
imageTransform.multiplyByRotation(-1, 0, 0, actualTilt);
}

// Perform image rotation
if (this.imageRotation != 0) {
double rotation = this.imageRotationReference == WorldWind.RELATIVE_TO_GLOBE ?
double actualRotation = this.imageRotationReference == WorldWind.RELATIVE_TO_GLOBE ?
rc.camera.heading - this.imageRotation : -this.imageRotation;
unitSquareTransform.multiplyByRotation(0, 0, 1, rotation);
imageTransform.multiplyByRotation(0, 0, 1, actualRotation);
}

// Apply pivot translation
unitSquareTransform.multiplyByTranslation(-offsetX, -offsetY, 0);
imageTransform.multiplyByTranslation(-offsetX, -offsetY, 0);

// Apply scale
unitSquareTransform.multiplyByScale(scaleX, scaleY, 1);
imageTransform.multiplyByScale(scaleX, scaleY, 1);

// If the placemark's icon is visible, enqueue a drawable icon for processing on the OpenGL thread.
WWMath.boundingRectForUnitSquare(imageTransform, imageBounds);
if (rc.frustum.intersectsViewport(imageBounds)) {
Pool<DrawableScreenTexture> pool = rc.getDrawablePool(DrawableScreenTexture.class);
DrawableScreenTexture drawable = DrawableScreenTexture.obtain(pool);
this.prepareDrawableIcon(rc, drawable);
rc.offerShapeDrawable(drawable, this.cameraDistance);
}

// If there's a label, perform these same operations for the label texture.
if (this.mustDrawLabel(rc)) {
// Render the label's texture when the label's position is in the frustum. If the label's position is outside
// the frustum we don't do anything. This ensures that label textures are rendered only as necessary.
this.labelTexture = rc.getText(this.label, this.activeAttributes.labelAttributes);
if (this.labelTexture == null && rc.frustum.containsPoint(placePoint)) {
this.labelTexture = rc.renderText(this.label, this.activeAttributes.labelAttributes);
}

if (this.labelTexture != null) {
int w = this.labelTexture.getWidth();
int h = this.labelTexture.getHeight();
this.activeAttributes.labelAttributes.textOffset.offsetForSize(w, h, offset);

labelTransform.setTranslation(
screenPlacePoint.x - offset.x,
screenPlacePoint.y - offset.y,
screenPlacePoint.z);

labelTransform.setScale(w, h, 1);

WWMath.boundingRectForUnitSquare(labelTransform, labelBounds);
if (rc.frustum.intersectsViewport(labelBounds)) {
Pool<DrawableScreenTexture> pool = rc.getDrawablePool(DrawableScreenTexture.class);
DrawableScreenTexture drawable = DrawableScreenTexture.obtain(pool);
this.prepareDrawableLabel(rc, drawable);
rc.offerShapeDrawable(drawable, this.cameraDistance);
}
}
}

// Release references to objects stored in the render resource cache.
this.activeTexture = null;
this.labelTexture = null;

// Enqueue a picked object that associates the placemark's icon and leader with its picked object ID.
if (rc.pickMode && rc.drawableCount() != drawableCount) {
rc.offerPickedObject(PickedObject.fromRenderable(this.pickedObjectId, this, rc.currentLayer));
}
}

/**
* Determines the placemark attributes to use for the current render pass.
*
* @param rc the current render context
*/
protected void determineActiveAttributes(RenderContext rc) {
if (this.highlighted && this.highlightAttributes != null) {
this.activeAttributes = this.highlightAttributes;
} else {
this.activeAttributes = this.attributes;
}
}

/**
* Determines the image texture and unit square transform to use for the current render pass.
*
* @param rc the current render context
*/
protected void determineActiveTexture(RenderContext rc) {
if (this.activeAttributes.imageSource != null) {
// Earlier in doRender(), an attempt was made to 'get' the activeTexture from the cache.
// If was not found in the cache we need to retrieve a texture from the image source.
if (this.activeTexture == null) {
this.activeTexture = rc.retrieveTexture(this.activeAttributes.imageSource, null); // puts retrieved textures in the cache
}
} else {
this.activeTexture = null; // there is no imageSource; draw a simple colored square
}
}

/**
Expand All @@ -876,7 +913,7 @@ protected void prepareDrawableIcon(RenderContext rc, DrawableScreenTexture drawa
}

// Use the plaemark's unit square transform matrix.
drawable.unitSquareTransform.set(unitSquareTransform);
drawable.unitSquareTransform.set(imageTransform);

// Configure the drawable according to the placemark's active attributes. Use a color appropriate for the pick
// mode. When picking use a unique color associated with the picked object ID. Use the texture associated with
Expand All @@ -887,6 +924,37 @@ protected void prepareDrawableIcon(RenderContext rc, DrawableScreenTexture drawa
drawable.enableDepthTest = this.activeAttributes.depthTest;
}

/**
* Prepares this placemark's label for processing in a subsequent drawing pass. Implementations must be
* careful not to leak resources from Placemark into the Drawable.
*
* @param rc the current render context
* @param drawable the Drawable to be prepared
*/
protected void prepareDrawableLabel(RenderContext rc, DrawableScreenTexture drawable) {
// Use the basic GLSL program to draw the placemark's label.
drawable.program = (BasicShaderProgram) rc.getShaderProgram(BasicShaderProgram.KEY);
if (drawable.program == null) {
drawable.program = (BasicShaderProgram) rc.putShaderProgram(BasicShaderProgram.KEY, new BasicShaderProgram(rc.resources));
}

// Use the label's unit square transform matrix.
drawable.unitSquareTransform.set(labelTransform);

// Configure the drawable according to the active label attributes. Use a color appropriate for the pick mode. When
// picking use a unique color associated with the picked object ID. Use the texture associated with the active
// attributes' text image and its associated tex coord transform. The text texture includes the appropriate
// color for drawing, specifying white for normal drawing ensures the color multiplication in the shader results
// in the texture's color.
if (rc.pickMode) {
drawable.color.set(this.pickColor);
} else {
drawable.color.set(1, 1, 1, 1);
}
drawable.texture = this.labelTexture;
drawable.enableDepthTest = this.activeAttributes.labelAttributes.isEnableDepthTest();
}

/**
* Prepares this placemark's leader for drawing in a subsequent drawing pass. Implementations must be careful not to
* leak resources from Placemark into the Drawable.
Expand Down Expand Up @@ -925,13 +993,10 @@ protected void prepareDrawableLeader(RenderContext rc, DrawableLines drawable) {
*
* @return True if there is a valid label and label attributes.
*/

protected boolean mustDrawLabel(RenderContext rc) {
return false;
// TODO: implement mustDrawLabel()
// return this.label != null
// && !this.label.isEmpty()
// && this.activeAttributes.labelAttributes != null;
return this.label != null
&& !this.label.isEmpty()
&& this.activeAttributes.labelAttributes != null;
}

/**
Expand Down
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