UGUI绘制多点连续的平滑曲线
程序员文章站
2023-12-13 16:16:58
本文实例为大家分享了ugui绘制平滑曲线的具体代码，供大家参考，具体内容如下
绘制
实现自定义的maskablegraphic挂载在ugui的ui节点上...
本文实例为大家分享了ugui绘制平滑曲线的具体代码，供大家参考，具体内容如下
绘制
实现自定义的maskablegraphic挂载在ugui的ui节点上
public class uguiobjectrender : maskablegraphic
{
/**
* points 为需要穿过的点
* segments 为曲线细分度
* linewidth 为曲线粗细
*/
protected override void onpopulatemesh(vertexhelper vh)
{
vh.drawbeziers(points,segments,linewidth);
}
}
需要时用的工具类在后面
二次贝塞尔工具类
using unityengine;
namespace vivi.uiextensions
{
/**
* created by vivi on 16/5/11.
*/
public class bezierutils {
public float p0x;
public float p1x;
public float p2x;
public float p3x;
public float p0y;
public float p1y;
public float p2y;
public float p3y;
public bezierutils(float p0x,float p0y,float p1x,float p1y,float p2x,float p2y,float p3x,float p3y) {
p0x = p0x;
p0y = p0y;
p1x = p1x;
p1y = p1y;
p2x = p2x;
p2y = p2y;
p3x = p3x;
p3y = p3y;
}
public bezierutils(vector2 p0,vector2 p1,vector2 p2,vector2 p3) {
p0x = p0.x;
p0y = p0.y;
p1x = p1.x;
p1y = p1.y;
p2x = p2.x;
p2y = p2.y;
p3x = p3.x;
p3y = p3.y;
}
public float beze_x(float t){
float it = 1-t;
return it*it*it*p0x + 3*it*it*t*p1x + 3*it*t*t*p2x + t*t*t*p3x;
}
public float beze_y(float t){
float it = 1-t;
return it*it*it*p0y + 3*it*it*t*p1y + 3*it*t*t*p2y + t*t*t*p3y;
}
//-------------------------------------------------------------------------------------
public float beze_speed_x(float t)
{
float it = 1-t;
return -3*p0x*it*it + 3*p1x*it*it - 6*p1x*it*t + 6*p2x*it*t - 3*p2x*t*t + 3*p3x*t*t;
}
public float beze_speed_y(float t)
{
float it = 1-t;
return -3*p0y*it*it + 3*p1y*it*it - 6*p1y*it*t + 6*p2y*it*t - 3*p2y*t*t + 3*p3y*t*t;
}
private float beze_speed(float t)
{
float sx = beze_speed_x(t);
float sy = beze_speed_y(t);
return (float) mathf.sqrt(mathf.pow(sx,2)+mathf.pow(sy,2));
}
//-------------------------------------------------------------------------------------
private float beze_length(float t)
{
float latestcount = 10000;
int steps = (int) mathf.ceil(latestcount * t);
if (steps == 0)
return 0;
if (steps % 2 != 0)
steps++;
float halfsteps = steps * .5f;
float nsum = 0;
float n1sum = 0;
float disstep = t / steps;
for (int i = 0; i < halfsteps; i++ ) {
n1sum += beze_speed((2 * i + 1) * disstep);
nsum += beze_speed(2 * i * disstep);
}
return (beze_speed(0) + beze_speed(1) + 2 * n1sum + 4 * nsum) * disstep / 3;
}
//-------------------------------------------------------------------------------------
private float beze_even(float t)
{
float len = t * beze_length(1);
float uc = 0;
do {
float ulen = beze_length(t);
float uspeed = beze_speed(t);
uc = t - (ulen - len) / uspeed;
if (mathf.abs(uc - t) < 0.0001)
break;
t = uc;
}while(true);
return uc;
}
private float totallength = -1;
public float gettotallength(){
if(totallength<0)
totallength = beze_length(1);
return totallength;
}
public vector2 getposition(float t){
return new vector2(beze_x(t),beze_y(t));
}
}
}
ugui 绘图工具类
using system.collections.generic;
using unityengine;
using unityengine.ui;
namespace vivi.uiextensions
{
public static class polygonhelper
{
public static void adduivertextriangles(this vertexhelper vh,uivertex[] verts)
{
for (int i = 0; i < verts.length; i += 3)
{
int currentvertcount = vh.currentvertcount;
for (int index = i; index < i+3; index++)
{
vh.addvert(verts[index].position, verts[index].color, verts[index].uv0, verts[index].uv1, verts[index].normal, verts[index].tangent);
}
vh.addtriangle(currentvertcount, currentvertcount + 1, currentvertcount + 2);
}
}
public static void adduivertextriangle(this vertexhelper vh,uivertex[] verts)
{
int currentvertcount = vh.currentvertcount;
for (int index = 0; index < 3; ++index)
vh.addvert(verts[index].position, verts[index].color, verts[index].uv0, verts[index].uv1, verts[index].normal, verts[index].tangent);
vh.addtriangle(currentvertcount, currentvertcount + 1, currentvertcount + 2);
}
private static void vertex(this list<uivertex> vertices,float x, float y , color color)
{
uivertex v = uivertex.simplevert;
v.color = color;
v.position = new vector2(x,y);
v.uv0 = vector2.zero;
}
//画圆形
public static void circle (this vertexhelper vh, vector2 pos, float radius,color color,bool filled = false) {
circle(vh,pos.x, pos.y, radius, mathf.max(1, (int)(6 * mathf.pow(radius,1/3f))),color,filled);
}
public static void circle (this vertexhelper vh, float x, float y, float radius,color color,bool filled = false) {
circle(vh,x, y, radius, mathf.max(1, (int)(6 * mathf.pow(radius,1/3f))),color,filled);
}
public static void circle (this vertexhelper vh, float x, float y, float radius, int segments ,color color,bool filled = false) {
if (segments > 0){
float angle = 2 * mathf.pi / segments;
float cos = mathf.cos(angle);
float sin = mathf.sin(angle);
float cx = radius, cy = 0;
list<uivertex> vs = new list<uivertex>();
segments--;
for (int i = 0; i < segments; i++) {
vs.vertex(x, y, color);
vs.vertex(x + cx, y + cy, color);
float temp = cx;
cx = cos * cx - sin * cy;
cy = sin * temp + cos * cy;
vs.vertex(x + cx, y + cy, color);
}
vs.vertex(x, y, color);
vs.vertex(x + cx, y + cy, color);
cx = radius;
cy = 0;
vs.vertex(x + cx, y + cy, color);
vh.adduivertextriangles(vs.toarray());
}
}
public static void drawbeziers(this vertexhelper vh,list<vector2> points,float segment,float width)
{
list<bezierutils> beziers = createbeziers(points);
if (beziers != null) {
for (int i = 0; i < beziers.count; i++) {
bezierutils bezier = beziers[i];
drawbezier(vh ,bezier,segment,width);
}
}
}
public static vector2 nor (this vector2 vec) {
float len = vec.magnitude;
if (len != 0) {
vec.x /= len;
vec.y /= len;
}
return vec;
}
public static vector2 rotate90 (this vector2 vec, int dir) {
float x = vec.x;
if (dir >= 0) {
vec.x = -vec.y;
vec.y = x;
} else {
vec.x = vec.y;
vec.y = -x;
}
return vec;
}
public static vector2 cpy (this vector2 vec) {
return new vector2(vec.x,vec.y);
}
private static void drawbezier(vertexhelper vh,bezierutils bezier,float segment,float width)
{
list<vector2> lpos = new list<vector2>();
list<vector2> rpos = new list<vector2>();
for (int i = 0; i <= segment; i++)
{
vector2 bezierpos = new vector2(bezier.beze_x((float)i/(float)segment),bezier.beze_y((float)i/(float)segment));
vector2 bezierspeed = new vector2(bezier.beze_speed_x((float)i/(float)segment),bezier.beze_speed_y((float)i/(float)segment));
vector2 offseta = bezierspeed.normalized.rotate90(1) * (0.5f * width);
vector2 offsetb = bezierspeed.normalized.rotate90(-1) * (0.5f * width);
lpos.add(bezierpos.cpy() + offseta);
rpos.add(bezierpos.cpy() + offsetb);
}
for (int j = 0; j < segment; j++)
{
vh.adduivertexquad(getquad(lpos[j], lpos[j+1], rpos[j+1], rpos[j]));
}
}
private static uivertex[] getquad (params vector2[] vertpos) {
uivertex[] vs = new uivertex[4];
vector2[] uv = new vector2[4];
uv[0] = new vector2(0, 0);
uv[1] = new vector2(0, 1);
uv[2] = new vector2(1, 0);
uv[3] = new vector2(1, 1);
for (int i = 0; i < 4; i++) {
uivertex v = uivertex.simplevert;
v.color = color.blue;
v.position = vertpos[i];
v.uv0 = uv[i];
vs[i] = v;
}
return vs;
}
private static list<bezierutils> createbeziers(list<vector2> points)
{
float scale = 0.6f;
list<bezierutils> beziers = new list<bezierutils>();
int origincount = points.count - 1;
list<vector2> midpoints = new list<vector2>();
for (int i = 0; i < origincount; i++) {
midpoints.add(new vector2(
mathf.lerp(points[i].x,points[i+1].x,0.5f),
mathf.lerp(points[i].y,points[i+1].y,0.5f))
);
}
list<vector2> ctrlpoints = new list<vector2>();
float offsetx;
float offsety;
ctrlpoints.add(new vector2(
points[0].x,
points[0].y
));
for (int i = 0; i < origincount - 1; i++) {
vector2 orginpoint = points[i + 1];
offsetx = orginpoint.x - mathf.lerp(midpoints[i].x, midpoints[i + 1].x, 0.5f);
offsety = orginpoint.y - mathf.lerp(midpoints[i].y, midpoints[i + 1].y, 0.5f);
ctrlpoints.add(new vector2(
midpoints[i].x + offsetx,
midpoints[i].y + offsety
));
ctrlpoints.add(new vector2(
midpoints[i+1].x + offsetx,
midpoints[i+1].y + offsety
));
ctrlpoints[i * 2 + 1] = vector2.lerp(orginpoint, ctrlpoints[i * 2 + 1], scale);
ctrlpoints[i * 2 + 2] = vector2.lerp(orginpoint, ctrlpoints[i * 2 + 2], scale);
}
ctrlpoints.add(new vector2(
points[points.count - 1].x,
points[points.count - 1].y
));
for (int i = 0; i < origincount; i++) {
bezierutils bezier = getbezier(points[i], ctrlpoints[i * 2], ctrlpoints[i * 2 + 1],points[i + 1]);
beziers.add(bezier);
}
return beziers;
}
public static bezierutils getbezier(vector2 p0,vector2 p1 ,vector2 p2,vector2 p3){
return new bezierutils( p0.x, p0.y, p1.x, p1.y, p2.x, p2.y, p3.x, p3.y);
}
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。