将笛卡尔坐标转换为屏幕坐标 [英] transform Cartesian Coordinates to Screen Coordinates

问题描述

在我的整个应用程序中，我使用笛卡尔坐标(2维)，一切都很好.但是最后，我需要在屏幕上显示一些点，并且我认为我需要将我的点从笛卡尔坐标转换为屏幕坐标，而且我不知道该怎么做.

用于笛卡尔坐标系中的exp
X轴[-200,200]
Y轴[-200,200]
代表屏幕坐标

X轴位于干涉[0,400]
Y轴的间隔为[0,400]

我需要一些有关转换"的帮助，因为我真的不知道该怎么做；
谢谢.

In my entire application I work with cartesian coordinates(2 dimensions ) and everything is just fine . But finaly I need to display some points on the screen and I think that I need to convert my points from cartesian to screen coordinates and I have no idee how to do that.

for exp in cartesina coordinates
X axis [-200,200]
Y axis [-200,200]
that meens that for the screen coordinates

X axis is in the interva [0,400]
Y axis is in the interval [0,400]

I need some help with this "conversion" because I really don`t know how to do it;
Thank you.

推荐答案

在公式下方有简短说明.

Xscr = Xc +(X-Pcx)*比例尺
Yscr = Yc-(Y-Pcy)*比例尺

Xscr =将cartestian映射到屏幕的结果
Xc =屏幕尺寸的一半
X = X笛卡尔坐标
Pcx =屏幕的中心在笛卡尔坐标中
S =比例因子

问候

Hi,

with a short description below the formula.

Xscr = Xc + (X-Pcx)*Scale
Yscr = Yc - (Y-Pcy)*Scale

Xscr = result from mapping cartestian to screen
Xc = half of screen size
X = X cartesian coordinate
Pcx = centre of the screen in caresian coordinates
S = Scale Factor

Regards

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