wordpress添加站点,唐山培训网站建设,自己做的网站为什么访问不,单人做网站需要掌握哪些知识笔刷大小调节
上面的代码中其实我们已经提供了笔刷大小的字段#xff0c;即brushSize#xff0c;现在只需要将该字段和界面中的Slider绑定即可#xff0c;Slider值的范围我们设置为1~20
代码中只需要做如下改动#xff1a;
public Slider brushSizeSlider; //控制笔刷大…笔刷大小调节
上面的代码中其实我们已经提供了笔刷大小的字段即brushSize现在只需要将该字段和界面中的Slider绑定即可Slider值的范围我们设置为1~20
代码中只需要做如下改动
public Slider brushSizeSlider; //控制笔刷大小的滑动条
public float brushSize brushSizeSlider.value; //笔刷大小取滑动条的值
完整代码如下
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;public class Painter : MonoBehaviour
{public RenderTexture renderTexture;public Slider brushSizeSlider;public Texture2D brushTexture; //笔刷纹理public float brushSize brushSizeSlider.value; //笔刷大小public float resolutionMultiplier 5; //线性插值密度调节private Vector2 previousMousePos; //记录上一帧鼠标的位置 void Update(){if (Input.GetMouseButtonDown(0)){previousMousePos Input.mousePosition;}if (Input.GetMouseButton(0)){var mousePosition Input.mousePosition;DrawLine(previousMousePos, mousePosition);previousMousePos mousePosition;}}private void DrawLine(Vector2 start, Vector2 end){float distance Vector2.Distance(start, end);int steps Mathf.CeilToInt(distance * resolutionMultiplier);for (int i 0; i steps; i){float t i / (float)steps;int x Mathf.FloorToInt(Mathf.Lerp(start.x, end.x, t));int y Mathf.FloorToInt(Mathf.Lerp(start.y, end.y, t));DrawBrush(x, y);}}private void DrawBrush(int x, int y){Rect brushRect new Rect(x, y, brushSize, brushSize);Graphics.SetRenderTarget(renderTexture);GL.PushMatrix();GL.LoadPixelMatrix(0, renderTexture.width, 0, renderTexture.height);Graphics.DrawTexture(brushRect, brushTexture);GL.PopMatrix();Graphics.SetRenderTarget(null);}}效果优化
运行效果如下图可见虽然笔刷粗细已可以调节但是在调节过程中滑动的同时滑动条周围有绘制的线条这本不该出现的出现的原因是因为我们监听了鼠标按下的事件来绘制这导致在操作滑动条的时候绘制依然在进行。 操作UI时屏蔽绘制
我们需要检测当前的鼠标是否在UI元素上如果在则不进行绘制这可以使用EventSystem的射线检测来实现如下我们定义一个函数当光标在UI元素上的时候返回true否则返回false
private bool IsPointerOverUIElement()
{PointerEventData eventData new PointerEventData(EventSystem.current);eventData.position Input.mousePosition;ListRaycastResult results new ListRaycastResult();EventSystem.current.RaycastAll(eventData, results);return results.Count 0;
}
我们在鼠标左键点击的时候判断是否在UI元素上如果在则禁止绘制
但有个问题我们用来绘制的RawImage也是UI元素它铺满整个屏幕这会导致我们始终没办法绘制我们可以将其Raycast Target关掉这样再操作UI元素的时候就不会进行多余的绘制了 完整代码如下
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;public class Painter : MonoBehaviour
{public RenderTexture renderTexture;public Slider brushSizeSlider; //控制笔刷大小的滑动条public Texture2D brushTexture; //笔刷纹理public float brushSize brushSizeSlider.value; //笔刷大小取滑动条的值public float resolutionMultiplier 5; //线性插值密度调节private Vector2 previousMousePos; //记录上一帧鼠标的位置 private bool startFromUIElement false; //点击是否是从UI元素上开始的void Update(){//判断光标是否在UI元素上if (Input.GetMouseButtonDown(0)){if (IsPointerOverUIElement()){startFromUIElement true;}previousMousePos Input.mousePosition;}if (Input.GetMouseButton(0) !startFromUIElement){var mousePosition Input.mousePosition;DrawLine(previousMousePos, mousePosition);previousMousePos mousePosition;}if (Input.GetMouseButtonUp(0)){startFromUIElement false;}}private void DrawLine(Vector2 start, Vector2 end){float distance Vector2.Distance(start, end);int steps Mathf.CeilToInt(distance * resolutionMultiplier);for (int i 0; i steps; i){float t i / (float)steps;int x Mathf.FloorToInt(Mathf.Lerp(start.x, end.x, t));int y Mathf.FloorToInt(Mathf.Lerp(start.y, end.y, t));DrawBrush(x, y);}}private void DrawBrush(int x, int y){Rect brushRect new Rect(x, y, brushSize, brushSize);Graphics.SetRenderTarget(renderTexture);GL.PushMatrix();GL.LoadPixelMatrix(0, renderTexture.width, 0, renderTexture.height);Graphics.DrawTexture(brushRect, brushTexture);GL.PopMatrix();Graphics.SetRenderTarget(null);}private bool IsPointerOverUIElement(){PointerEventData eventData new PointerEventData(EventSystem.current);eventData.position Input.mousePosition;ListRaycastResult results new ListRaycastResult();EventSystem.current.RaycastAll(eventData, results);return results.Count 0;}}在下一节我将为大家介绍如何调节线条的颜色~
