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hey i'm drawing some lines that are a cross section of the grand canyon in my research project. user can select anywhere from 1 cross section to 24 evenly spaced across time (models erosion).
I found this handy formula for getting evenly spaced colors (not taking into account the biases of our eyes or brain)
//(x is the iteration we are on, so this goes from 0.0f to 1.0f
float hue = (float) x / (XSectionManager.getXSection(0).getMaxNIterates() + 1 ); //hue
float saturation = 1.0f; //saturation
float brightness = 1.0f; //brightness
Color myRGBColor = Color.getHSBColor(hue, saturation, brightness);
gl.glColor3f(myRGBColor.getRed(), myRGBColor.getGreen(), myRGBColor.getBlue());
the problem is the first line draws yellow just fine then I get a few lines cyan and then a few magenta. I even stepped through it in intellij and it has a color swatch that shows you what color myRGBColor is and it changes correctly in there.
I'm probably not doing the draw calls correctly?
Thanks for your help.
<code>
private void drawScaleBar() {
gl.glClearColor(.75f, .75f, .75f, 1.0f);
gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
float scaleHeight = canvas.getHeight();
if (scaleHeight > 300.0f) scaleHeight = 300.0f;
float scaleBorder = 0.03f; // Fraction of screen height
scaleHeight = (1.0f - 2 * scaleBorder) * scaleHeight; // Give a little border
float scaleWidth = 0.05f * scaleHeight; // Seems like a good ratio
float scalePosX;
float scalePosY;
// scalePosX = canvas.getHeight() * scaleBorder;
// scalePosY = canvas.getHeight() * (1.0f - scaleBorder) - scaleHeight;
scalePosX = 10.0f;
scalePosY = 320.0f - scaleHeight;
float textPosX, textPosY;
textPosX = scalePosX + scaleWidth + 10.0f;
// Calculate divisions and division locations
// Hardwired for now
float drawScaleX = 0.01911016f; // defaults
float drawScaleY = 0.33095807f;
float saturation = 1.0f; //saturation
float brightness = 1.0f; //brightness
//for (int x = XSectionManager.getXSection(0).getNIterates(); x < XSectionManager.getXSection(0).getMaxNIterates(); x++) {
if (XSectionManager.getXSection(0) != null && XSectionManager.getXSection(0).getNIterates() > 0) {
drawScaleX = .8f * (canvas.getWidth() / (XSectionManager.getXSection(0).crossSectionMaxX - XSectionManager.getXSection(0).crossSectionMinX));
drawScaleY = 15.0f * (canvas.getHeight() / (XSectionManager.getXSection(0).crossSectionMaxY - XSectionManager.getXSection(0).crossSectionMinY));
for (int x = 1; x <= XSectionManager.getXSection(0).getNIterates(); x++){
float hue = (float) x / (XSectionManager.getXSection(0).getMaxNIterates() + 1 ); //hue
Color myRGBColor = Color.getHSBColor(hue, saturation, brightness);
System.out.println("x is " + x + " getMaxNIterates is " + XSectionManager.getXSection(0).getMaxNIterates());
gl.glColor3f(myRGBColor.getRed(), myRGBColor.getGreen(), myRGBColor.getBlue());
gl.glBegin(GL2.GL_LINE_STRIP);
gl.glLineWidth(3.5f);
for (int i = 1; i < XSectionManager.getXSection(0).dMaxValues; i++) {
// System.out.println("x is " + x);
gl.glVertex3f(XSectionManager.getXSection(0).values[0][i] * drawScaleX,
XSectionManager.getXSection(0).values[x][i] * drawScaleY,
-1.55f + (x * .001f));
// System.out.print("X = " + XSectionManager.getXSection(0).values[0][i] + " ");
// System.out.print("Y = " + XSectionManager.getXSection(0).values[x][i] + " \n");
}
gl.glEnd();
}
// System.out.println("NIterates is " + XSectionManager.getXSection(0).getNIterates());
// System.out.println("getMaxNIterates is " + XSectionManager.getXSection(0).getMaxNIterates());
}
//}
//System.out.println(canvas.getHeight());
gl.glEnd();
gl.glColor3f(0.0f, 0.0f, 0.0f);
gl.glBegin(GL2.GL_LINES);
gl.glVertex3f(scalePosX * 5, scalePosY + 30.0f, -1.5f);
gl.glVertex3f(50 + (40000 * drawScaleX), scalePosY + 30.0f, -1.5f);
gl.glEnd();
// Draw label tics
gl.glColor3f(0.0f, 0.0f, 0.0f);
gl.glBegin(GL2.GL_LINES);
gl.glVertex3f(50, scalePosY + 30.0f, -1.5f);
gl.glVertex3f(50, scalePosY + 35.0f, -1.5f);
//System.out.println("Line 50 * drawScaleX " + (50 * drawScaleX));
gl.glVertex3f(50 + (10000 * drawScaleX), scalePosY + 30.0f, -1.5f);
gl.glVertex3f(50 + (10000 * drawScaleX), scalePosY + 35.0f, -1.5f);
//System.out.println("Line 10050 * drawScaleX " + (10050 * drawScaleX));
gl.glVertex3f(50 + (20000 * drawScaleX), scalePosY + 30.0f, -1.5f);
gl.glVertex3f(50 + (20000 * drawScaleX), scalePosY + 35.0f, -1.5f);
//System.out.println("Line 20050 * drawScaleX " + (20050 * drawScaleX));
gl.glVertex3f(50 + (30000 * drawScaleX), scalePosY + 30.0f, -1.5f);
gl.glVertex3f(50 + (30000 * drawScaleX), scalePosY + 35.0f, -1.5f);
//System.out.println("Line 30050 * drawScaleX " + (30050 * drawScaleX));
gl.glVertex3f(50 + (40000 * drawScaleX), scalePosY + 30.0f, -1.5f);
gl.glVertex3f(50 + (40000 * drawScaleX), scalePosY + 35.0f, -1.5f);
//System.out.println("Line 40050 * drawScaleX " + (40050 * drawScaleX));
gl.glEnd();
// Draw labels
vertScaleTextEngine.beginRendering(canvas.getWidth(), canvas.getHeight());
gl.glMatrixMode(5888);
gl.glPushMatrix();
gl.glRotatef(270, 0, 0, 1);
vertScaleTextEngine.setColor(0.0f, 0.0f, 0.0f, 1.0f);
int total = 0;
//61200
for (int i = 0; i < 5; i++) {
textPosY = (float) (10000 * i * drawScaleX);
String Label = Float.toString(total);
total = total + 10000;
vertScaleTextEngine.draw(Label, (int) textPosX - 90, (int) textPosY + 50);
//System.out.println("TextPosY " + ((int) textPosY -50));
}
vertScaleTextEngine.endRendering();
}
</code>
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