/**
* Updates a strip vertex with vertices shaping a rounded beginning. This method is called when
* the polygon is open (not {@link #isClosedPolygon()}).
*
* @param inside whether this is a <b>inside</b> triangle strip, as opposed to an outside triangle
* strip.
*/
private void updateVertexBeginning(boolean inside) {
// if polygon is not closed the endings must be fixed
int index = 0;
BoundingBox box = boundingBoxes.items[0];
box.needsCullingUpdate = true;
StripVertex stripVertex = vertexDataArray.items[index];
AuxVertexFinder auxVertexFinder = this.auxVertexFinder;
Array<Float> vertexData = inside ? stripVertex.insideVertexData : stripVertex.outsideVertexData;
vertexData.clear();
auxVertexFinder.setInsideStrip(inside);
Vector2 currentVertex = vertices.items[index];
Vector2 currentAux = auxVertexFinder.getAuxBeginning(vertices, index, MathUtils.PI * 0.5f);
add(currentVertex, VERTEX_TYPE_USER, vertexData);
add(currentAux, VERTEX_TYPE_AUX, vertexData);
currentAux = auxVertexFinder.getAuxBeginning(vertices, index, MathUtils.PI * 0.25f);
add(currentVertex, VERTEX_TYPE_USER, vertexData);
add(currentAux, VERTEX_TYPE_AUX, vertexData);
currentAux = auxVertexFinder.getAuxBeginning(vertices, index, 0);
add(currentVertex, VERTEX_TYPE_USER, vertexData);
add(currentAux, VERTEX_TYPE_AUX, vertexData);
}
/**
* @param halfWidth half the width of the edges.
* @return this for chaining.
*/
public OutlinePolygon setHalfWidth(float halfWidth) {
this.halfWidth = halfWidth;
auxVertexFinder.setHalfWidth(this.halfWidth);
for (int i = 0; i < needsUpdate.size; i++) {
needsUpdate.items[i] = true;
}
changesToStripOrCulling = true;
return this;
}
/**
* The aux vertex finder needs to know if the polygon is a clockwise one. Instead of figuring out
* whether the polygon is clockwise each time it needs to know this method is called at most once
* during {@link #updateStripAndCulling()}, and only if the vertices has been changed.
*/
private void updateAuxVertexFinderClockwise() {
boolean clockwisePolygon = Util.clockwisePolygon(vertices);
auxVertexFinder.setClockwise(clockwisePolygon);
}
// TODO Comment
private void updateVertexDefault(int index, boolean inside) {
BoundingBox box = boundingBoxes.items[index / verticesPerBox];
box.needsCullingUpdate = true;
int k = index % vertices.size;
StripVertex stripVertex = vertexDataArray.items[k];
AuxVertexFinder auxVertexFinder = this.auxVertexFinder;
Array<Float> vertexData = inside ? stripVertex.insideVertexData : stripVertex.outsideVertexData;
vertexData.clear();
auxVertexFinder.setInsideStrip(inside);
Vector2 currentVertex = vertices.items[k];
Vector2 defaultAux = auxVertexFinder.getAux(vertices, k);
boolean roundCorner = false;
{ // within these brackets i figure out if i should round the corner.
// i hope to rewrite this code to something i can understand one day after writing it
Vector2 previous = tmp.set(vertices.items[(k - 1 + vertices.size) % vertices.size]);
Vector2 copyOfDefaultAux = tmp1.set(defaultAux);
previous.sub(currentVertex);
copyOfDefaultAux.sub(currentVertex);
float angle = previous.angleRad() - copyOfDefaultAux.angleRad();
angle = ((angle + MathUtils.PI2) % MathUtils.PI) * 2f;
boolean angleMoreThanPI;
if (inside) {
angleMoreThanPI = angle > MathUtils.PI * 1.1f;
} else {
angleMoreThanPI = angle < MathUtils.PI * 0.9f;
}
if (auxVertexFinder.clockWisePolygon) angleMoreThanPI = !angleMoreThanPI;
if (angleMoreThanPI) {
boolean sharpCorner = Math.abs(MathUtils.PI - angle) > Math.PI * 0.4f;
roundCorner = roundSharpCorners && sharpCorner;
}
}
if (roundCorner) {
Vector2 beginningAux = auxVertexFinder.getAuxEnding(vertices, k, 0);
Vector2 endingAux = auxVertexFinder.getAuxBeginning(vertices, k, 0);
Vector2 middleAux =
tmp.set(defaultAux).sub(currentVertex).nor().scl(halfWidth).add(currentVertex);
add(currentVertex, VERTEX_TYPE_USER, vertexData);
add(beginningAux, VERTEX_TYPE_AUX, vertexData);
add(currentVertex, VERTEX_TYPE_USER, vertexData);
add(middleAux, VERTEX_TYPE_AUX, vertexData);
add(currentVertex, VERTEX_TYPE_USER, vertexData);
add(endingAux, VERTEX_TYPE_AUX, vertexData);
} else {
add(currentVertex, VERTEX_TYPE_USER, vertexData);
add(defaultAux, VERTEX_TYPE_AUX, vertexData);
}
}
/** Draws anti aliased polygon edges. */
public OutlinePolygon(OutlinePolygonDef outlinePolygonDef) {
debugRenderer =
new DebugRenderer(this) {
@Override
public void draw(ShapeRenderer shapeRenderer) {
if (drawCullingRectangles) drawCullingRectangles(shapeRenderer, Color.GREEN);
if (drawLineFromFirstToLast) drawLineFromFirstToLast(shapeRenderer, Color.BLUE);
if (drawTriangleStrips) drawTriangleStrips(shapeRenderer, Color.RED, Color.ORANGE);
}
@Override
void update() {
super.update();
boolean enabled = drawLineFromFirstToLast;
enabled |= drawCullingRectangles;
enabled |= drawTriangleStrips;
enabled &= myParents.size == 0;
boolean change = this.enabled != enabled;
if (!change) return;
this.enabled = enabled;
debugColors.clear();
if (drawCullingRectangles) {
debugColors.add(new DebugColor(Color.GREEN, "Bounding box"));
}
if (drawLineFromFirstToLast) {
debugColors.add(
new DebugColor(Color.BLUE, "Line from first to last vertex in bounding box"));
}
if (drawTriangleStrips) {
debugColors.add(new DebugColor(Color.RED, "Triangle strip visualization"));
debugColors.add(new DebugColor(Color.ORANGE, "Triangle strip visualization"));
}
}
};
auxVertexFinder.setHalfWidth(this.halfWidth);
if (outlinePolygonDef != null) {
setDrawOutside(outlinePolygonDef.drawOutside);
setDrawInside(outlinePolygonDef.drawInside);
setColor(outlinePolygonDef.color);
setClosedPolygon(outlinePolygonDef.closedPolygon);
setHalfWidth(outlinePolygonDef.halfWidth);
setWeight(outlinePolygonDef.weight);
setRoundSharpCorners(outlinePolygonDef.roundSharpCorners);
setDrawLineFromFirstToLast(outlinePolygonDef.drawLineFromFirstToLast);
setDrawCullingRectangles(outlinePolygonDef.drawBoundingBoxes);
setDrawTriangleStrips(outlinePolygonDef.drawTriangleStrips);
setVisible(outlinePolygonDef.visible);
setVertices(outlinePolygonDef.vertices);
setScale(outlinePolygonDef.scale);
setAngle(outlinePolygonDef.angle);
setPosition(outlinePolygonDef.position);
setOpacity(outlinePolygonDef.opacity);
}
}