Question

我需要一种方法将X和Y坐标转换为角度。我有这个代码，但我需要这个布局：

90 270

360

private double getAngle(double xTouch, double yTouch) {
    double x = xTouch - (slideBtn.getWidth() / 2d);
    double y = slideBtn.getHeight() - yTouch - (slideBtn.getHeight() / 2d);
    switch (getQuadrant(x, y)) {
        case 1:
            return Math.asin(y / Math.hypot(x, y)) * 180 / Math.PI;
        case 2:
            return 180 - Math.asin(y / Math.hypot(x, y)) * 180 / Math.PI;
        case 3:
            return 180 + (-1 * Math.asin(y / Math.hypot(x, y)) * 180 / Math.PI);
        case 4:
            return 360 + Math.asin(y / Math.hypot(x, y)) * 180 / Math.PI;
        default:
            return 0;
    }
}

/**
 * @return The selected quadrant.
 */
private static int getQuadrant(double x, double y) {
    if (x >= 0) {
        return y >= 0 ? 1 : 4;
    } else {
        return y >= 0 ? 2 : 3;
    }
}

编辑，澄清问题：我遇到的问题是我的角度是x，y角度。例如：0/360度是圆的顶侧，180度是圆的底侧。我尝试使用上面的代码修复它（使用不同的象限，但这不起作用）。接受的答案对我有用。

Answer 1

我不确定你想要达到的目标，但是使用atan2功能获得一个角度是不是更容易？

http://docs.oracle.com/javase/7/docs/api/java/lang/Math.html#atan2(double，double）

如果您不熟悉这里可以阅读的功能：

http://en.wikipedia.org/wiki/Atan2

编辑，代码示例：

所以，在讨论之后，我认为这是一些有用的代码

public static double getAngle(int x, int y)
{
    return 1.5 * Math.PI - Math.atan2(y,x); //note the atan2 call, the order of paramers is y then x
}

基本上，它计算负Y轴与正顺时针方向之间的角度。我希望这就是你一直在寻找的。

Answer 2

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {

@Override
protected void configure(HttpSecurity http) throws Exception {
http.httpBasic().realmName("ad-ldap");
http.formLogin().loginPage("/login").loginProcessingUrl("/loginProcess");
}

@Override
protected void configure(AuthenticationManagerBuilder auth) throws Exception {
auth
.ldapAuthentication()
    .userSearchBase("OU=users,DC=local")
    .userSearchFilter("(sAMAccountName={0})")
    .groupSearchBase("OU=groups,DC=local")
    .groupSearchFilter("sAMAccountName={0}");
}
}

	var x,x1,x2,y,y1,y2;
		var cells = 'cell0';
		var h,w;
		var cx,cy;
		var dx,dy;
		var derajat;
		var deg;
		var ang;
		var light;
		var control;
			function mouse_watch(event){
				x = event.clientX;
				y = event.clientY;
				cell_data(cells);
				koordinat(x2,y2);
				busur(derajat);
			}
			function koordinat(x2,y2){
				x2 = x-cx;
				y2 = y-cy;
				yk = y2;
				xk = x2;
			}
			function busur(derajat){

				y1 = Math.sqrt((Math.abs(yk)*Math.abs(yk))+(Math.abs(xk)*(Math.abs(xk))));
				x1 = 0;
				dy = yk-y1;
				dx = xk-x1;
				rad = Math.atan2(dy, dx);
				derajat = rad * (360 / Math.PI);
				cell = document.getElementById(cells);
				ang = cell.getElementsByClassName('angle0')[0];
				ang.style.transform = 'rotate('+derajat+'deg)';
				light = ang.getElementsByClassName('points')[0];
				light.style.height = y1+'px';
			}
			function cell_data(cells){
				cell = document.getElementById(cells);
				h = Number(cell.style.height.replace('px',''));
				w = Number(cell.style.width.replace('px',''));
				cy = Number(cell.style.top.replace('px',''))+h/2;
				cx = Number(cell.style.left.replace('px',''))+w/2;
			}

.preview_engine{
				position: absolute;
				top: 0;
				left: 0;
				padding: 10px;
				background-color: #2E8AE6;
				color: white;
			}
			body{
				cursor: default;
				width: 100%;
				height: 100%;
				font-family: Arial;
				font-size: 12px;
			}
			.fieldwork{
				width: 100%;
				height: 100%;
				position: absolute;
				top: 0px;
				left: 0px;
			}
			.cell{
				position: relative;
				transition : width 2s, height 2s, top 2s, left 2s;
				background-color: red;
			}
			.angle0{
				width: 200px;
				height: 200px;
				position: absolute;
				top: -75px;
				left: -75px;
				background-color: green;
				border-radius: 50%;
				opacity: 0.5;
				transition : width 2s, height 2s, top 2s, left 2s;
			}
			.points{
				width: 10px;
				height: 10px;
				position: absolute;
				left: 95px;
				top: 95px;
				background-color: red;
				border-radius: 1em;
				opacity: none;
			}

Answer 3

此类将操纵杆的输入转换为角度，0为正y轴为0度，正x为90，负y为180，负x为270

public class GetAngle {

    public static void main(String[] args) {

        System.out.println(getAngle(-1,0));

    }

    public static double getAngle(double x, double y) {

        // Checking if the joystick is at center (0,0) and returns a 'stand still'
        // command by setting the return to 99999
        if (x == 0 && y == 0) {

            return (99999);

            // Returns a value based on the quadrant and does some math to deliver the angle
            // of the coordinates
        } else if (x >= 0 && y > 0) {

            return (90 - (Math.atan(y / x) * 180 / Math.PI));

        } else if (x > 0 && y <= 0) {

            return (90 - (Math.atan(y / x) * 180 / Math.PI));

        } else if (x <= 0 && y < 0) {

            return (180 + (Math.atan(y / x) * 180 / Math.PI));

        } else if (x < 0 && y >= 0) {

            return (270 - (Math.atan(y / x) * 180 / Math.PI));

        } else
            return (99999);

    }

}

将X，Y转换为角度

3 个答案: