我需要在libgdx中为财务应用创建一个饼图。你能指点一个例子或代码片段来了解它吗?
答案 0 :(得分:0)
你可以使用shaperenderer: 阅读此classMethods shaperendere:
arc(float x,float y,float radius,float start,float degrees)
circle(float x,float y,float radius)
曲线(float x1,float y1,float cx1,float cy1,float cx2,float cy2, float x2,float y2,int segments)
OR
public class Arc extends ShapeRenderer{
private final ImmediateModeRenderer renderer;
private final Color color = new Color(1, 1, 1, 1);
public Arc(){
renderer = super.getRenderer();
}
public void arc (float x, float y, float radius, float start, float degrees) {
int segments = (int)(6 * (float)Math.cbrt(radius) * (degrees / 360.0f));
if (segments <= 0) throw new IllegalArgumentException("segments must be > 0.");
float colorBits = color.toFloatBits();
float theta = (2 * MathUtils.PI * (degrees / 360.0f)) / segments;
float cos = MathUtils.cos(theta);
float sin = MathUtils.sin(theta);
float cx = radius * MathUtils.cos(start * MathUtils.degreesToRadians);
float cy = radius * MathUtils.sin(start * MathUtils.degreesToRadians);
for (int i = 0; i < segments; i++) {
renderer.color(colorBits);
renderer.vertex(x + cx, y + cy, 0);
float temp = cx;
cx = cos * cx - sin * cy;
cy = sin * temp + cos * cy;
renderer.color(colorBits);
renderer.vertex(x + cx, y + cy, 0);
}
}
//// or
public void arc (float x, float y, float radius, float start, float degrees, int segments) {
if (segments <= 0) throw new IllegalArgumentException("segments must be > 0.");
float colorBits = color.toFloatBits();
float theta = (2 * MathUtils.PI * (degrees / 360.0f)) / segments;
float cos = MathUtils.cos(theta);
float sin = MathUtils.sin(theta);
float cx = radius * MathUtils.cos(start * MathUtils.degreesToRadians);
float cy = radius * MathUtils.sin(start * MathUtils.degreesToRadians);
if (shapeType == ShapeType.Line) {
check(ShapeType.Line, ShapeType.Filled, segments * 2 + 2);
renderer.color(colorBits);
renderer.vertex(x, y, 0); <--- CENTER
renderer.color(colorBits);
renderer.vertex(x + cx, y + cy, 0); <--- LINE TO START POINT
for (int i = 0; i < segments; i++) {
renderer.color(colorBits);
renderer.vertex(x + cx, y + cy, 0);
float temp = cx;
cx = cos * cx - sin * cy;
cy = sin * temp + cos * cy;
renderer.color(colorBits);
renderer.vertex(x + cx, y + cy, 0);
}
renderer.color(colorBits);
renderer.vertex(x + cx, y + cy, 0); <-- LINE TO END POINT
...
}