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plotter: HeatMap with Rasterized smooths the heatmap

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评估

难度
5/5
预计耗时
一周以上
新手友好度
30/100
Issue 类型
缺陷
描述清晰度
需要澄清
活跃度
停滞
技术栈
go

调研方向

首先检查 plotter.HeatMap 的栅格化路径及其对 plotter.Image 的使用。重现离散单元格数据与连续场之间的差异,然后在进行更改之前确定预期的插值行为或 API;完成标准是移除矢量单元格伪影,同时不强制进行不需要的平滑处理。

由索引模型根据 Issue 内容生成。

描述

The addition of the rasterized option for the plotter.HeatMap was added to remove the lines between heat map cells resulting from vector drawing artifacts. The approach take was to make a heatmap where each heat map cell is a single pixel; the rasterisation. This small image is then rescaled to the size of the plot. This has the consequence that the image is rescaled with interpolation due to the use of plotter.Image which has this effect. In some cases, for example when you are plotting a continuous field you are likely to want this, but in cases where there is a discrete cell for each value, this is not correct. What the Rasterized option actually is a Smoothed option.

The original issue was raised to remove the artifactual lines, which is orthogonal. One solution is to have an unexported image rescaling function that does not interpolate. However, this loses the nice property of smooth scalar fields when they are wanted unless additional API knobs are added.

主要语言
Go
星标
3k
派生
202
PR 合并指标
30 天内没有已合并 PR

环境准备

从这里开始

  1. 先读完整个 Issue,再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

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