Matlab 保存具有预定义大小的图形

发布于 2024-12-01 21:36:47 字数 698 浏览 0 评论 0原文

我有一个图，上面有 2 个图。我正在尝试将图形保存为宽度较长的 png。

%%%%%%%%%%%%First%%%%%%%%%%%%%%%%%%
a=figure('Name','First Structure');
load C:\Users\William\workspace\P5\FirstAdd.txt
n=FirstAdd(:,1);
t=FirstAdd(:,2);
subplot(1,2,1);
plot(n,t);
xlabel('n');
ylabel('Time');
title('First Structure''s Add');
grid on

load C:\Users\William\workspace\P5\FirstContains.txt
n=FirstContains(:,1);
t=FirstContains(:,2);
subplot(1,2,2);
plot(n,t);
xlabel('n');
ylabel('Time');
title('First Structure''s Contains');
grid on

rect=[250,250,1080,480];
set(a, 'OuterPosition',rect);
print(a,'-dpng','First Structure.png');

在最后 3 行中，我设置了图形窗口，使 2 个图足够宽。但是，当我尝试保存图形时，图像是其默认大小，其中绘图被压扁。

我缺少什么？

原文

I have a figure with 2 plots on it. I am trying to save the figure as a png with a longer width.

%%%%%%%%%%%%First%%%%%%%%%%%%%%%%%%
a=figure('Name','First Structure');
load C:\Users\William\workspace\P5\FirstAdd.txt
n=FirstAdd(:,1);
t=FirstAdd(:,2);
subplot(1,2,1);
plot(n,t);
xlabel('n');
ylabel('Time');
title('First Structure''s Add');
grid on

load C:\Users\William\workspace\P5\FirstContains.txt
n=FirstContains(:,1);
t=FirstContains(:,2);
subplot(1,2,2);
plot(n,t);
xlabel('n');
ylabel('Time');
title('First Structure''s Contains');
grid on

rect=[250,250,1080,480];
set(a, 'OuterPosition',rect);
print(a,'-dpng','First Structure.png');

In the last 3 lines I set the figure window such that the 2 plots are wide enough. However, when I try to save the figure, the image is its default size in which the plots are squished.

What am I missing?

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寒江雪… 2024-12-08 21:36:47

OuterPosition figure 属性仅在以下位置发生变化：屏幕上有图形窗口；它不会改变打印方式。

Matlab 在“打印”图形时使用 PaperSize、PaperUnits、PaperPosition 和类似的图形属性，即使它们实际上没有意义，例如生成位图文件时。（将 PaperUnits 设置为 像素 是合乎逻辑的，但它不起作用。）

获取以像素为单位的特定图像大小的过程是：将 PaperPosition 设置为某个尺寸，以英寸（或其他物理单位）为单位，然后使用 - 以每英寸点数指定所需的分辨率 r 选项print：

r = 150; % pixels per inch
set(gcf, 'PaperUnits', 'inches', 'PaperPosition', [0 0 1080 480]/r);
print(gcf,'-dpng',sprintf('-r%d',r), 'bar.png');

其中一些特性在 打印 功能。

您还可以尝试使用 -r0 选项来告诉 Matlab 使用显示分辨率。

The OuterPosition figure property only changes where the figure window is on the screen; it doesn't change how it will print.

Matlab uses the PaperSize, PaperUnits, PaperPosition and similar figure properties when "printing" a figure, even when they don't really make sense, such as when producing a bitmap file. (Settings PaperUnits to pixels would be logical, but it doesn't work.)

The procedure for getting a particular image size in pixels is to set PaperPosition to some size in inches (or another physical unit) and then specify the desired resolution in dots per inch using the -r option to print:

r = 150; % pixels per inch
set(gcf, 'PaperUnits', 'inches', 'PaperPosition', [0 0 1080 480]/r);
print(gcf,'-dpng',sprintf('-r%d',r), 'bar.png');

Some of these peculiarities are discussed in the help for the print function.

You could also try the -r0 option which tells Matlab to use the display resolution.

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蘑菇王子 2024-12-08 21:36:47

按照@nibot的示例，我编写了以下函数：

function save_as_png(handle, filename, dpi, width, height);
    set(handle, 'PaperUnits', 'inches', 'PaperPosition', [0 0 width height] / dpi);
    print(handle, '-dpng', ['-r' num2str(dpi)], filename);
end

Following @nibot's example, I wrote the following function:

function save_as_png(handle, filename, dpi, width, height);
    set(handle, 'PaperUnits', 'inches', 'PaperPosition', [0 0 width height] / dpi);
    print(handle, '-dpng', ['-r' num2str(dpi)], filename);
end

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