Question

float boxkPosition- (¡%7) * boxHidth; // Calculate the Y position of the box. float boxYPosition- (i/7) boxHeight; 43 45 46 47 48 49 // Use println to show what the values are for the position. printin ("i : ", i, "X:", boxXPosition, "Y:"' , boxYPosition); 1: .11 // Put your colour code here. float mapvalue = ma p (value, minValue, maxValue, θ, 1); 51 52 53 54 color from -color (204, 102, 3); color to Color(255, 59, 7); color map- terpColor (fron, to, 0,2); fill (map); 56 57 58 59 // End colour code. // Draw a rectangle for each cell of the heatmap. 2ct(boxXPosition, boxYPosition, boxwidth, boxHeight); 61 63 64 65

Hi, how do you add color to a heat map using "lerpcolor" (application: processing)?

Answer 1

void applyColor() { // Generate the heat map

color c1 = color(0, 0, 255); // Blue color
color c2 = color(0, 255, 255); // color Cyan
color c3 = color(0, 255, 0); // Green color
color c4 = color(255, 255, 0); // Yellow color
color c5 = color(240, 150, 5); // Orange color
color c6 = color(255, 0, 0); // Red color

loadPixels();
int p = 0;
color c;
float fraction;

for (int i = 0; i < rows; i++) {
for (int j = 0; j < cols; j++) {
float value = interp_array[i][j];

if (value>= 25 && value<26) {
fraction = value;
c = lerpColor(c1, c2, fraction);
} else if (value>=26 && value<27) {
fraction = value;
c = lerpColor(c2, c3, fraction);
} else if (value>=27 && value<28) {
fraction = value;
c = lerpColor(c3, c4, fraction);
} else if (value>=28 && value<29) {
fraction = value;
c = lerpColor(c4, c5, fraction);
} else if (value>=29 && value<30) {
fraction = value;
c = lerpColor(c5, c6, fraction);
} else
c = c6;
pixels[p++] = c;
}
}
updatePixels();