/**
* 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);
}
/**
* When you call methods like for example {@link #setHalfWidth(float)} or {@link
* #updateVertex(int, float, float)} work is being queued up. Before each draw call this method is
* automatically called to do all this work.
*
* <p>It can be smart to call this method after you are done configuring your OutlinePolygon, but
* before you exit your loading screen. This way you do more work during the loading screen and
* get less initial lag.
*/
public void updateStripAndCulling() {
if (!changesToStripOrCulling) return;
updateAllBoxIndices();
boolean clockwiseUpdated = false;
for (int i = 0; i < needsUpdate.size; i++) {
boolean update = needsUpdate.items[i];
if (update) {
if (!clockwiseUpdated) {
clockwiseUpdated = true;
updateAuxVertexFinderClockwise();
}
if (drawInside) {
updateVertex(i, true);
}
if (drawOutside) {
updateVertex(i, false);
}
needsUpdate.items[i] = false;
}
}
for (BoundingBox box : boundingBoxes) {
if (box.needsCullingUpdate) {
updateBoxCulling(box);
box.needsCullingUpdate = false;
}
}
}
// 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);
}
}