coordinateaxischart's Introduction

CoordinateAxisChart

A simple Math coordinate system in Android.
Using this library to draw function lines and points to a coordinate system.

ScreenShot

Supported functions

function name	description
linear function (一次函数)	y = a * x + b
power function (幂函数)	y = a * x ^c + b
exponential function (指数函数)	y = a * c^x + b
logarithmic function (对数函数)	y = a * log(c * x + d) + b
circular function (三角函数)	y = a * sin(c * x + d) + b, also cos(), tan(), cot() tan( ) and cot( ) is still under optimizing.

iOS version entrance

CoordinateAxisChart For iOS

Gradle

repositories {
    jcenter()
}

Add the following dependency to build.gradle:

dependencies {
	compile 'com.kiba:CoordinateAxisChart:1.0.0'
}

Usage

Setup

<com.kiba.coordinateaxischart.CoordinateAxisChart
        android:id="@+id/coordinateAxisChart"
        android:layout_width="300dp"
        android:layout_height="300dp"/>

coordinateAxisChart = (CoordinateAxisChart) findViewById(R.id.coordinateAxisChart);
ChartConfig config = new ChartConfig();

// the max value of the axis 坐标轴的最大值
config.setMax(12);

/* 
    The precision of tangent lines of the points on the function line 
    recommended value: 1-10 
    函数图像上的点的切线的精度 推荐值：1-10
*/
config.setPrecision(1); 

/*
    The x axis will be equally separated to some segment points according to segmentSize
    and will connect these points when drawing the function.
    将x轴分割成segmentSize个点，成像时会将这些点连接起来。
*/
config.setSegmentSize(50);

coordinateAxisChart.setConfig(config);

Add a function line

// linear----LinearType(a, b)
FunctionLine<LinearType> line1 = new FunctionLine<>(new LinearType(2, 1), Color.parseColor("#43A047"));
coordinateAxisChart.addFunctionLine(line1);

// power----PowerType(a, b, c)
FunctionLine<PowerType> line2 = new FunctionLine<>(new PowerType(1, 0, 2), Color.parseColor("#e53935"));
coordinateAxisChart.addFunctionLine(line2);

// log----LogType(a, b, c, d)
FunctionLine<LogType> line3 = new FunctionLine<>(new LogType(1, 0, 1, 0), Color.parseColor("#757575"));
coordinateAxisChart.addFunctionLine(line3);

// sin (circular)----CircularType(a, b, c, d, CircularType.Circular)
FunctionLine<CircularType> line4 = new FunctionLine<>(
    	new CircularType(1, 0, 1, 0, CircularType.Circular.SIN), Color.parseColor("#FFCA28"));
coordinateAxisChart.addFunctionLine(line4);

// exp----ExpType(a, b, c)
FunctionLine<ExpType> line5 = new FunctionLine<>(new ExpType(1, 0, 2), Color.parseColor("#00B0FF"));
coordinateAxisChart.addFunctionLine(line5);

coordinateAxisChart.invalidate();

Add a point

SinglePoint point = new SinglePoint(new PointF(1f, 2f));
point.setPointColor(Color.RED);
coordinateAxisChart.addPoint(point);
coordinateAxisChart.invalidate();

Reset

coordinateAxisChart.reset();
coordinateAxisChart.invalidate();

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coordinateaxischart's Issues

tan( ) 和 cot( )函数图像绘制不正确，请问如何修改？

关于幂函数的指数不是整数时图像不显示问题

当幂函数的指数不是整数时，图像是出不来的，比如 y = x^2.1 ,这是因为Math.pow(a,b);这个函数不支持 a<0且b不是整数的情况，此种情况会导致 domain error 错误。而程序会生成 x 小于0的点和 x 大于 0的点，当 x 小于0 求 y值时，所得y = NaN,故导致函数点无法绘制，函数图像绘制失败。请知悉。
我的解决办法是当指数不是整数时，不生成x < 0的点，这样导致函数只有x>0的部分，但不会报错不显示。

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