如何在RStudio中调整绘图尺寸且不使图像模糊？

• 调高RStudio绘图设备分辨率
  在RStudio的全局选项里，找到「绘图」设置，把「分辨率（DPI）」调高（比如从默认的96改成192或更高）。这样就算设置了fig.width/fig.height，IDE内的渲染会用更高分辨率，避免模糊。操作步骤：工具→全局选项→绘图→分辨率，修改后重启RStudio生效。

• 代码块添加dpi参数
  在R代码块里同时加上dpi参数，和fig.width/fig.height配合，强制提高渲染分辨率。示例：

  ggplot(data=data.frame()) + 
      scale_x_continuous(name = "rMZ", limits = c(-0.05, 1.15), breaks = seq(0,1,0.25)) +
      scale_y_continuous(name = "rDZ", limits = c(-0.05, 1.05), breaks = seq(0,1,0.25)) +
      coord_fixed() +
      annotate(geom = "curve", 
        x = 1.03, y = 0.1, xend = 0.65, yend = 0.88,
        arrow = arrow(length = unit(0.05, "npc"), ends="both", type="closed"),
        linewidth = 1.8,
        curvature = 0.18
      ) +
      annotate("text", x = 0.61, y = 0.93, angle = 43, label="MORE SHARED\nENVIRONMENT", size = 3, fontface = "bold") +
      annotate("text", x = 1.03, y = 0.03, angle = 7, label="MORE GENETIC\nINTERACTION", size = 3, fontface = "bold")
  

• 匹配系统缩放调整RStudio界面缩放
  如果你的系统显示缩放比例较高（比如125%或150%），RStudio可能因为适配问题导致绘图模糊。可以在「外观」设置里调整「界面缩放」，让它和系统缩放匹配，或者直接设为100%后再调整绘图尺寸参数。操作步骤：工具→全局选项→外观→界面缩放。

• 调整ggplot元素相对大小
  增大绘图尺寸后，文字、线条等元素的相对大小会变小，视觉上容易显得模糊。可以通过theme手动调整元素大小，配合尺寸参数：

  ggplot(data=data.frame()) + 
      scale_x_continuous(name = "rMZ", limits = c(-0.05, 1.15), breaks = seq(0,1,0.25)) +
      scale_y_continuous(name = "rDZ", limits = c(-0.05, 1.05), breaks = seq(0,1,0.25)) +
      coord_fixed() +
      annotate(geom = "curve", 
        x = 1.03, y = 0.1, xend = 0.65, yend = 0.88,
        arrow = arrow(length = unit(0.05, "npc"), ends="both", type="closed"),
        linewidth = 1.8,
        curvature = 0.18
      ) +
      annotate("text", x = 0.61, y = 0.93, angle = 43, label="MORE SHARED\nENVIRONMENT", size = 3, fontface = "bold") +
      annotate("text", x = 1.03, y = 0.03, angle = 7, label="MORE GENETIC\nINTERACTION", size = 3, fontface = "bold") +
      theme(
        axis.text = element_text(size = 12),
        axis.title = element_text(size = 14)
      )
  

内容的提问来源于stack exchange，提问作者Mohan