InitGraph(); rows=31;cols=47; ScaleWindow(0, 0,cols+1, rows+1); Colour(Black); BoxFill(0,0,cols+1,rows+1); pic1=new Array(cols);pic2=new Array(cols); for(var i = 0;i<=cols;i++){ pic1[i]=new Array(rows);pic2[i]=new Array(rows); } filt=new Array(3); filt[0]=new Array( 1,-2, 1); //A difference filter filt[1]=new Array(-2, 4,-2); filt[2]=new Array( 1,-2, 1); //Set up picture with a diamond on shaded ground m=(rows+cols)/2; for (i = 0;i<= cols;i++){ for (j = 0; j<=rows;j++) { k = Math.abs(i - cols/2) + Math.abs(j - rows/2); if (k<rows/3) {k = 30;}else{k=0;}; k = 100 + k + 2 * i; pic1 [i][j] = k; pic2 [i][j] = k; c = k; ColourRGB(c, c, c); BoxFill(i, j, 1, 1); } } // filter(); i=1; j=1; setTimeout('eval(document.panels.step.value);',1000);
//function filter() { // Colour(Green); // for(var i = 1;i<cols;i++){ //for each point // for(var j = 1;j<rows;j++) { //except edge m = 0; for (k = 0;k<=2;k++) { for (l = 0;l<= 2;l++) { m = m + pic1 [i+k-1][j+l-1]*filt[l][k]; } } m=m+100; ColourRGB(m, m, m); BoxFill(i,j,1,1); j++; if(j>=rows){ j=1; i++; } if(i<cols){ setTimeout('eval(document.panels.step.value);',2); }