如何在OpenGL中填充java形状
现在,我当前的渲染代码如下:
public void fill(Shape shape, float xOffset, float yOffset) {
AffineTransform transform = new AffineTransform();
transform.translate(xOffset, yOffset);
PathIterator pi = shape.getPathIterator(transform, 1);
int winding = pi.getWindingRule();
ShapeRenderer r = getInstance();
float[] coords = new float[6];
boolean drawing = false;
while (!pi.isDone()) {
int segment = pi.currentSegment(coords);
switch (segment) {
case PathIterator.SEG_CLOSE:
if (drawing) {
r.endPoly();
}
break;
case PathIterator.SEG_LINETO:
r.lineTo(coords);
break;
case PathIterator.SEG_MOVETO:
if (drawing) {
r.endPoly();
}
drawing = true;
r.beginPoly(winding);
r.moveTo(coords);
break;
default:
throw new IllegalArgumentException("Unexpected value: " + segment);
}
pi.next();
}
}
ShaperEnder:
private final Deque<Queue<Float>> vertices = new ConcurrentLinkedDeque<>();
@Override
public void beginPoly(int windingRule) {
}
@Override
public void endPoly() {
Queue<Float> q;
GL11.glBegin(GL11.GL_LINE_LOOP);
while ((q = vertices.poll()) != null) {
Float x, y;
while ((x = q.poll()) != null && (y = q.poll()) != null) {
GL11.glVertex2f(x, y);
}
}
GL11.glEnd();
}
@Override
public void moveTo(float[] vertex) {
Queue<Float> q = new ConcurrentLinkedQueue<>();
vertices.offer(q);
lineTo(vertex);
}
@Override
public void lineTo(float[] vertex) {
Queue<Float> q = vertices.peekLast();
q.offer(vertex[0]);
q.offer(vertex[1]);
}
假设我想像JavaAWT一样,成功地填充这个形状。。。我该怎么做? (已经尝试使用GL_多边形,但它只填充整个O,我有一个填充圆,而不是O。也尝试使用jogamp glu的部分,但它只是没有渲染任何东西,不知道为什么)
# 1 楼答案
当然可以
GL_POLYGON
用于Convex形状,并填充由多边形包围的整个区域您有两种选择:
使用
GL_POLYGON
两次绘制白色形状,然后在白色形状内绘制红色形状使用^{} 并形成一个仅绘制轮廓的形状。原语可以通过在外轮廓和内轮廓上交替指定点来形成