Line chart and Gradient

Figure:
View:

Package COM. example. test_chart; import android. content. context; import android. graphics. canvas; import android. graphics. color; import android. graphics. lineargradient; import android. graphics. paint; import android. graphics. shader; import android. view. view; public class chartviewextends view {public int xpoint = 30; // The X coordinate of the origin public int ypoint = 280; // The Y coordinate of the origin public int XScale = 40; // The Scale length of X is public int yscale = 40 ;/ /Y Scale length public int xlength = 240; // X axis length public int ylength = 240; // y axis length Public String [] xlabel; // X scale Public String [] ylabel; // y scale Public String [] data; // data Public String title; // display title Public chartview (context) {super (context);} public void setinfo (string [] xlabels, string [] ylabels, string [] alldata, string strtitle) {xlabel = xlabels; ylabel = ylabels; data = alldata; Title = strtitle;} @ ove Rride protected void ondraw (canvas) {super. ondraw (canvas); // override the ondraw method canvas. drawcolor (color. dkgray); // set the background color paint = NULL; paint paint2 = new paint (); paint2.setstyle (paint. style. stroke); paint2.setantialias (true); // de-sawtooth paint2.setcolor (color. blue); // color paint paint1 = new paint (); paint1.setstyle (paint. style. stroke); paint1.setantialias (true); // de-sawtooth paint1.setcolor (color. green); paint = Paint1; paint. settextsize (12); // set the axis text size/* set the gradient color to change */shader mshader = new lineargradient (0, 0,100,100, new int [] {color. red, color. green, color. blue, color. yellow, color. ltgray}, null, shader. tilemode. repeat); // a material to create a linear gradient along a line. Paint. setshader (mshader); // sets the Y axis canvas. drawline (xpoint, ypoint-ylength, xpoint, ypoint, paint); // axis for (INT I = 0; I * yscale <ylength; I ++) {canvas. drawline (xpoint, ypoint-I * yscale, xpoint + 5, ypoint-I * yscale, paint); // scale try {canvas. drawtext (ylabel [I], XPoint-22, ypoint-I * yscale + 5, paint); // text} catch (exception e) {}} canvas. drawline (xpoint, ypoint-ylength, XPoint-3, ypoint-ylength + 6, paint); // arrow ca Nvas. drawline (xpoint, ypoint-ylength, xpoint + 3, ypoint-ylength + 6, paint); // you can specify the X axis canvas. drawline (xpoint, ypoint, xpoint + xlength, ypoint, paint); // axis for (INT I = 0; I * XScale <xlength; I ++) {canvas. drawline (xpoint + I * XScale, ypoint, xpoint + I * XScale, YPoint-5, paint); // scale try {canvas. drawtext (xlabel [I], xpoint + I * XScale-10, ypoint + 20, paint ); // text // data value if (I> 0 & ycoord (data [I-1])! =-999 & ycoord (data [I])! =-999) // ensures valid data canvas. drawline (xpoint + (I-1) * XScale, ycoord (data [I-1]), xpoint + I * XScale, ycoord (data [I]), paint); canvas. drawcircle (xpoint + I * XScale, ycoord (data [I]), 2, paint);} catch (exception e) {}} canvas. drawline (xpoint + xlength, ypoint, xpoint + XLength-6, YPoint-3, paint); // arrow canvas. drawline (xpoint + xlength, ypoint, xpoint + XLength-6, ypoint + 3, paint); paint. settextsize (16); canvas. drawtext (title, 150, 50, paint);} private int ycoord (string y0) // calculate the Y coordinate when drawing. If no data exists,-999 {int y is returned; try {Y = integer. parseint (y0);} catch (exception e) {return-999; // if an error occurs,-999 is returned.} Try {return ypoint-y * yscale/integer. parseint (ylabel [1]);} catch (exception e) {} return y ;}}

Java:

Package COM. example. test_chart; import android. OS. bundle; import android. app. activity; import android. view. menu; public class mainactivity extends activity {@ overrideprotected void oncreate (bundle savedinstancestate) {super. oncreate (savedinstancestate); chartview myview = new chartview (this); myview. setinfo (New String [] {"7-11", "7-12", "7-13", "7-14", "7-15 ", "7-16", "7-17"}, // X axis scale new string [] {"", "50", "100", "150 ", "200", "250"}, // y axis scale new string [] {105 + "", 203 + "", 100 + "", 46 + "", 95 + "", 80 + "", 102 + ""}, // data "icon title"); setcontentview (myview) ;}@ overridepublic Boolean oncreateoptionsmenu (menu) {// inflate the menu; this adds items to the action bar if it is present. getmenuinflater (). inflate (R. menu. activity_main, menu); Return true ;}}