AbstractChart2D::AbstractChart2D()
: mTickCount(9), mTickSize(10),
mLeftMargin(64), mRightMargin(10), mTopMargin(10), mBottomMargin(32),
mXMax(1), mXMin(0), mYMax(1), mYMin(0),
mDecorVBO(0), mBorderProgram(0), mSpriteProgram(0)
{
/* load font Vera font for chart text
* renderings, below function actually returns a constant
* reference to font object used by Chart objects, we are
* calling it here just to make sure required font glyphs
* are loaded into the shared Font object */
getChartFont();
mBorderProgram = initShaders(gChartVertexShaderSrc, gChartFragmentShaderSrc);
mSpriteProgram = initShaders(gChartVertexShaderSrc, gChartSpriteFragmentShaderSrc);
mBorderPointIndex = glGetAttribLocation (mBorderProgram, "point");
mBorderColorIndex = glGetUniformLocation(mBorderProgram, "color");
mBorderMatIndex = glGetUniformLocation(mBorderProgram, "transform");
mSpriteTickcolorIndex = glGetUniformLocation(mSpriteProgram, "tick_color");
mSpriteMatIndex = glGetUniformLocation(mSpriteProgram, "transform");
mSpriteTickaxisIndex = glGetUniformLocation(mSpriteProgram, "isYAxis");
/* the following function sets the member variable
* mTickCount and creates VBO to hold tick marks and the corresponding
* text markers for those ticks on the axes */
setTickCount(mTickCount);
}
void AbstractChart::renderTickLabels(int pWindowId, unsigned w, unsigned h,
std::vector<std::string> &texts,
glm::mat4 &transformation, int coor_offset,
bool useZoffset)
{
auto &fonter = getChartFont();
fonter->setOthro2D(int(w), int(h));
float pos[2];
for (StringIter it = texts.begin(); it!=texts.end(); ++it) {
int idx = int(it - texts.begin());
glm::vec4 p = glm::vec4(mTickTextX[idx+coor_offset],
mTickTextY[idx+coor_offset],
(useZoffset ? mTickTextZ[idx+coor_offset] : 0), 1);
glm::vec4 res = transformation * p;
/* convert text position from [-1,1] range to
* [0, 1) range and then offset horizontally
* to compensate for margins and ticksize */
pos[0] = w*(res.x/res.w+1.0f)/2.0f;
pos[1] = h*(res.y/res.w+1.0f)/2.0f;
/* offset based on text size to align
* text center with tick mark position */
if(coor_offset < mTickCount) {
pos[0] -= ((CHART2D_FONT_SIZE*it->length()/2.0f));
}else if(coor_offset >= mTickCount && coor_offset < 2*mTickCount) {
pos[1] -= ((CHART2D_FONT_SIZE));
}else {
pos[0] -= ((CHART2D_FONT_SIZE*it->length()/2.0f));
pos[1] -= ((CHART2D_FONT_SIZE));
}
fonter->render(pWindowId, pos, WHITE, it->c_str(), CHART2D_FONT_SIZE);
}
}
AbstractChart::AbstractChart(int pLeftMargin, int pRightMargin, int pTopMargin, int pBottomMargin)
: mTickCount(9), mTickSize(10),
mLeftMargin(pLeftMargin), mRightMargin(pRightMargin),
mTopMargin(pTopMargin), mBottomMargin(pBottomMargin),
mXMax(1), mXMin(0), mYMax(1), mYMin(0), mZMax(1), mZMin(0),
mXTitle("X-Axis"), mYTitle("Y-Axis"), mZTitle("Z-Axis"),
mDecorVBO(-1), mBorderProgram(-1), mSpriteProgram(-1),
mBorderAttribPointIndex(-1), mBorderUniformColorIndex(-1),
mBorderUniformMatIndex(-1), mSpriteUniformMatIndex(-1),
mSpriteUniformTickcolorIndex(-1), mSpriteUniformTickaxisIndex(-1)
{
CheckGL("Begin AbstractChart::AbstractChart");
/* load font Vera font for chart text
* renderings, below function actually returns a constant
* reference to font object used by Chart objects, we are
* calling it here just to make sure required font glyphs
* are loaded into the shared Font object */
getChartFont();
mBorderProgram = initShaders(gChartVertexShaderSrc, gChartFragmentShaderSrc);
mSpriteProgram = initShaders(gChartVertexShaderSrc, gChartSpriteFragmentShaderSrc);
mBorderAttribPointIndex = glGetAttribLocation (mBorderProgram, "point");
mBorderUniformColorIndex = glGetUniformLocation(mBorderProgram, "color");
mBorderUniformMatIndex = glGetUniformLocation(mBorderProgram, "transform");
mSpriteUniformTickcolorIndex = glGetUniformLocation(mSpriteProgram, "tick_color");
mSpriteUniformMatIndex = glGetUniformLocation(mSpriteProgram, "transform");
mSpriteUniformTickaxisIndex = glGetUniformLocation(mSpriteProgram, "isYAxis");
CheckGL("End AbstractChart::AbstractChart");
}
void AbstractChart2D::renderChart(const void* pWnd, int pX, int pY, int pVPW, int pVPH)
{
float w = float(pVPW - (mLeftMargin + mRightMargin + mTickSize));
float h = float(pVPH - (mTopMargin + mBottomMargin + mTickSize));
float offset_x = (1.9f * (mLeftMargin+mTickSize) + (w - pVPW)) / pVPW;
float offset_y = (1.9f * (mBottomMargin+mTickSize) + (h - pVPH)) / pVPH;
float scale_x = w / pVPW;
float scale_y = h / pVPH;
CheckGL("Begin Chart::render");
bindResources(pWnd);
/* bind the plotting shader program */
glUseProgram(mBorderProgram);
/* set uniform attributes of shader
* for drawing the plot borders */
glm::mat4 trans = glm::scale(glm::translate(glm::mat4(1),
glm::vec3(offset_x, offset_y, 0)),
glm::vec3(scale_x, scale_y, 1));
glUniformMatrix4fv(mBorderMatIndex, 1, GL_FALSE, glm::value_ptr(trans));
glUniform4fv(mBorderColorIndex, 1, WHITE);
/* Draw borders */
glDrawArrays(GL_LINE_LOOP, 0, 4);
/* reset shader program binding */
glUseProgram(0);
/* bind the sprite shader program to
* draw ticks on x and y axes */
glPointSize((GLfloat)mTickSize);
glUseProgram(mSpriteProgram);
glUniform4fv(mSpriteTickcolorIndex, 1, WHITE);
glUniformMatrix4fv(mSpriteMatIndex, 1, GL_FALSE, glm::value_ptr(trans));
/* Draw tick marks on y axis */
glUniform1i(mSpriteTickaxisIndex, 1);
glDrawArrays(GL_POINTS, 4, mTickCount);
/* Draw tick marks on x axis */
glUniform1i(mSpriteTickaxisIndex, 0);
glDrawArrays(GL_POINTS, 4+mTickCount, mTickCount);
glUseProgram(0);
glPointSize(1);
unbindResources();
auto &fonter = getChartFont();
fonter->setOthro2D(int(w), int(h));
float pos[2];
/* render tick marker texts for y axis */
for (StringIter it = mYText.begin(); it!=mYText.end(); ++it) {
int idx = int(it - mYText.begin());
glm::vec4 res = trans * glm::vec4(mTickTextX[idx], mTickTextY[idx], 0, 1);
/* convert text position from [-1,1] range to
* [0, 1) range and then offset horizontally
* to compensate for margins and ticksize */
pos[0] = w*(res.x+1.0f)/2.0f;
pos[1] = h*(res.y+1.0f)/2.0f;
pos[0] -= (pVPW-w)*0.60f;
fonter->render(pWnd, pos, WHITE, it->c_str(), CHART2D_FONT_SIZE);
}
/* render tick marker texts for x axis */
for (StringIter it = mXText.begin(); it!=mXText.end(); ++it) {
int idx = int(it - mXText.begin());
/* mTickCount offset is needed while reading point coordinates for
* x axis tick marks */
glm::vec4 res = trans * glm::vec4(mTickTextX[idx+mTickCount], mTickTextY[idx+mTickCount], 0, 1);
/* convert text position from [-1,1] range to
* [0, 1) range and then offset vertically
* to compensate for margins and ticksize */
pos[0] = w*(res.x+1.0f)/2.0f;
pos[1] = h*(res.y+1.0f)/2.0f;
pos[1] -= (pVPH-h)*0.34f;
/* offset horizontally based on text size to align
* text center with tick mark position */
pos[0] -= (CHART2D_FONT_SIZE*(it->length()-2)/2.0f);
fonter->render(pWnd, pos, WHITE, it->c_str(), CHART2D_FONT_SIZE);
}
/* render chart axes titles */
if (!mYTitle.empty()) {
glm::vec4 res = trans * glm::vec4(-1.0f, 0.0f, 0.0f, 1.0f);
pos[0] = w*(res.x+1.0f)/2.0f;
pos[1] = h*(res.y+1.0f)/2.0f;
pos[0] -= (pVPW-w)*0.76;
fonter->render(pWnd, pos, WHITE, mYTitle.c_str(), CHART2D_FONT_SIZE, true);
}
if (!mXTitle.empty()) {
glm::vec4 res = trans * glm::vec4(0.0f, -1.0f, 0.0f, 1.0f);
pos[0] = w*(res.x+1.0f)/2.0f;
pos[1] = h*(res.y+1.0f)/2.0f;
pos[1] -= (pVPH-h)*0.66;
fonter->render(pWnd, pos, WHITE, mXTitle.c_str(), CHART2D_FONT_SIZE);
}
CheckGL("End Chart::render");
}
void AbstractChart2D::renderChart(int pX, int pY, int pVPW, int pVPH) const
{
float w = float(pVPW - (mLeftMargin + mRightMargin + mTickSize));
float h = float(pVPH - (mTopMargin + mBottomMargin + mTickSize));
float offset_x = (2.0f * (mLeftMargin+mTickSize) + (w - pVPW)) / pVPW;
float offset_y = (2.0f * (mBottomMargin+mTickSize) + (h - pVPH)) / pVPH;
float scale_x = w / pVPW;
float scale_y = h / pVPH;
CheckGL("Begin Chart::render");
glEnableVertexAttribArray(mBorderPointIndex);
glBindBuffer(GL_ARRAY_BUFFER, mDecorVBO);
glVertexAttribPointer(mBorderPointIndex, 2, GL_FLOAT, GL_FALSE, 0, 0);
/* bind the plotting shader program */
glUseProgram(mBorderProgram);
/* set uniform attributes of shader
* for drawing the plot borders */
glm::mat4 trans = glm::scale(glm::translate(glm::mat4(1),
glm::vec3(offset_x, offset_y, 0)),
glm::vec3(scale_x, scale_y, 1));
glUniformMatrix4fv(mBorderMatIndex, 1, GL_FALSE, glm::value_ptr(trans));
glUniform4fv(mBorderColorIndex, 1, WHITE);
/* Draw borders */
glDrawArrays(GL_LINE_LOOP, 0, 4);
/* reset shader program binding */
glUseProgram(0);
/* bind the sprite shader program to
* draw ticks on x and y axes */
glPointSize((GLfloat)mTickSize);
/* Following line is required for opengl compatibility profile */
glEnable(GL_POINT_SPRITE);
glUseProgram(mSpriteProgram);
glUniform4fv(mSpriteTickcolorIndex, 1, WHITE);
glUniformMatrix4fv(mSpriteMatIndex, 1, GL_FALSE, glm::value_ptr(trans));
/* Draw tick marks on y axis */
glUniform1i(mSpriteTickaxisIndex, 1);
glDrawArrays(GL_POINTS, 4, mTickCount);
/* Draw tick marks on x axis */
glUniform1i(mSpriteTickaxisIndex, 0);
glDrawArrays(GL_POINTS, 4+mTickCount, mTickCount);
glUseProgram(0);
glPointSize(1);
glDisableVertexAttribArray(mBorderPointIndex);
glBindBuffer(GL_ARRAY_BUFFER, 0);
/* Following line is required for opengl compatibility profile */
glDisable(GL_POINT_SPRITE);
auto &fonter = getChartFont();
fonter.setOthro2D(int(w), int(h));
float pos[2];
/* render tick marker texts for y axis */
for (StringIter it = mYText.begin(); it!=mYText.end(); ++it) {
int idx = int(it - mYText.begin());
glm::vec4 res = trans * glm::vec4(mTickTextX[idx], mTickTextY[idx], 0, 1);
pos[0] = w*(res.x+1.0f)/2.0f;
pos[1] = h*(res.y+1.0f)/2.0f;
pos[0] -= (pVPW-w)*0.50f;
fonter.render(pos, WHITE, it->c_str(), 15);
}
/* render tick marker texts for x axis */
for (StringIter it = mXText.begin(); it!=mXText.end(); ++it) {
int idx = int(it - mXText.begin());
/* mTickCount offset is needed while reading point coordinates for
* x axis tick marks */
glm::vec4 res = trans * glm::vec4(mTickTextX[idx+mTickCount], mTickTextY[idx+mTickCount], 0, 1);
pos[0] = w*(res.x+1.0f)/2.0f;
pos[1] = h*(res.y+1.0f)/2.0f;
pos[1] -= (pVPH-h)*0.32f;
fonter.render(pos, WHITE, it->c_str(), 15);
}
/* render chart axes titles */
if (!mYTitle.empty()) {
glm::vec4 res = trans * glm::vec4(-1.0f, 0.0f, 0.0f, 1.0f);
pos[0] = w*(res.x+1.0f)/2.0f;
pos[1] = h*(res.y+1.0f)/2.0f;
pos[0] -= (pVPW-w)*0.70f;
fonter.render(pos, WHITE, mYTitle.c_str(), 15, true);
}
if (!mXTitle.empty()) {
glm::vec4 res = trans * glm::vec4(0.0f, -1.0f, 0.0f, 1.0f);
pos[0] = w*(res.x+1.0f)/2.0f;
pos[1] = h*(res.y+1.0f)/2.0f;
pos[1] -= (pVPH-h)*0.70f;
fonter.render(pos, WHITE, mXTitle.c_str(), 15);
}
CheckGL("End Chart::render");
}
void Chart3D::renderChart(int pWindowId, int pX, int pY, int pVPW, int pVPH)
{
CheckGL("Being Chart3D::renderChart");
float w = float(pVPW - (mLeftMargin + mRightMargin + mTickSize));
float h = float(pVPH - (mTopMargin + mBottomMargin + mTickSize));
Chart3D::bindResources(pWindowId);
/* bind the plotting shader program */
glUseProgram(mBorderProgram);
/* set uniform attributes of shader
* for drawing the plot borders */
glm::mat4 model = glm::rotate(glm::mat4(1.0f), -glm::radians(90.f), glm::vec3(0,1,0)) * glm::rotate(glm::mat4(1.0f), -glm::radians(90.f), glm::vec3(1,0,0)) * glm::scale(glm::mat4(1.f), glm::vec3(1.0f, 1.0f, 1.0f));
glm::mat4 view = glm::lookAt(glm::vec3(-1,0.5f,1.0f), glm::vec3(1,-1,-1),glm::vec3(0,1,0));
glm::mat4 projection = glm::ortho(-2.f, 2.f, -2.f, 2.f, -1.1f, 10.f);
glm::mat4 mvp = projection * view * model;
glm::mat4 trans = mvp;
glUniformMatrix4fv(mBorderUniformMatIndex, 1, GL_FALSE, glm::value_ptr(trans));
glUniform4fv(mBorderUniformColorIndex, 1, WHITE);
/* Draw borders */
glDrawArrays(GL_LINES, 0, 6);
/* reset shader program binding */
glUseProgram(0);
/* bind the sprite shader program to
* draw ticks on x and y axes */
glEnable(GL_PROGRAM_POINT_SIZE);
glPointSize((GLfloat)mTickSize);
glUseProgram(mSpriteProgram);
glUniform4fv(mSpriteUniformTickcolorIndex, 1, WHITE);
glUniformMatrix4fv(mSpriteUniformMatIndex, 1, GL_FALSE, glm::value_ptr(trans));
/* Draw tick marks on z axis */
glUniform1i(mSpriteUniformTickaxisIndex, 1);
glDrawArrays(GL_POINTS, 6, mTickCount);
/* Draw tick marks on y axis */
glUniform1i(mSpriteUniformTickaxisIndex, 0);
glDrawArrays(GL_POINTS, 6 + mTickCount, mTickCount);
/* Draw tick marks on x axis */
glUniform1i(mSpriteUniformTickaxisIndex, 0);
glDrawArrays(GL_POINTS, 6 + (2*mTickCount), mTickCount);
glUseProgram(0);
glPointSize(1);
glDisable(GL_PROGRAM_POINT_SIZE);
Chart3D::unbindResources();
renderTickLabels(pWindowId, w, h, mZText, trans, 0);
renderTickLabels(pWindowId, w, h, mYText, trans, mTickCount);
renderTickLabels(pWindowId, w, h, mXText, trans, 2*mTickCount);
auto &fonter = getChartFont();
fonter->setOthro2D(int(w), int(h));
float pos[2];
/* render chart axes titles */
if (!mZTitle.empty()) {
glm::vec4 res = trans * glm::vec4(-1.0f, -1.0f, 0.0f, 1.0f);
pos[0] = w*(res.x/res.w+1.0f)/2.0f;
pos[1] = h*(res.y/res.w+1.0f)/2.0f;
pos[0] -= 6*(mTickSize * (w/pVPW));
pos[1] += mZTitle.length()/2 * CHART2D_FONT_SIZE;
fonter->render(pWindowId, pos, WHITE, mZTitle.c_str(), CHART2D_FONT_SIZE, true);
}
if (!mYTitle.empty()) {
glm::vec4 res = trans * glm::vec4(1.0f, 0.0f, -1.0f, 1.0f);
pos[0] = w*(res.x/res.w+1.0f)/2.0f;
pos[1] = h*(res.y/res.w+1.0f)/2.0f;
pos[0] += 0.5 * ((mTickSize * (w/pVPW)) + mYTitle.length()/2 * CHART2D_FONT_SIZE);
pos[1] -= 4*(mTickSize * (h/pVPH));
fonter->render(pWindowId, pos, WHITE, mYTitle.c_str(), CHART2D_FONT_SIZE);
}
if (!mXTitle.empty()) {
glm::vec4 res = trans * glm::vec4(0.0f, -1.0f, -1.0f, 1.0f);
pos[0] = w*(res.x/res.w+1.0f)/2.0f;
pos[1] = h*(res.y/res.w+1.0f)/2.0f;
pos[0] -= (mTickSize * (w/pVPW)) + mXTitle.length()/2 * CHART2D_FONT_SIZE;
pos[1] -= 4*(mTickSize * (h/pVPH));
fonter->render(pWindowId, pos, WHITE, mXTitle.c_str(), CHART2D_FONT_SIZE);
}
CheckGL("End Chart3D::renderChart");
}
void Chart2D::renderChart(int pWindowId, int pX, int pY, int pVPW, int pVPH)
{
CheckGL("Begin Chart2D::renderChart");
float w = float(pVPW - (mLeftMargin + mRightMargin + mTickSize));
float h = float(pVPH - (mTopMargin + mBottomMargin + mTickSize));
float offset_x = (2.0f * (mLeftMargin+mTickSize) + (w - pVPW)) / pVPW;
float offset_y = (2.0f * (mBottomMargin+mTickSize) + (h - pVPH)) / pVPH;
float scale_x = w / pVPW;
float scale_y = h / pVPH;
Chart2D::bindResources(pWindowId);
/* bind the plotting shader program */
glUseProgram(mBorderProgram);
/* set uniform attributes of shader
* for drawing the plot borders */
glm::mat4 trans = glm::translate(glm::scale(glm::mat4(1),
glm::vec3(scale_x, scale_y, 1)),
glm::vec3(offset_x, offset_y, 0));
glUniformMatrix4fv(mBorderUniformMatIndex, 1, GL_FALSE, glm::value_ptr(trans));
glUniform4fv(mBorderUniformColorIndex, 1, WHITE);
/* Draw borders */
glDrawArrays(GL_LINE_LOOP, 0, 4);
/* reset shader program binding */
glUseProgram(0);
/* bind the sprite shader program to
* draw ticks on x and y axes */
glPointSize((GLfloat)mTickSize);
glUseProgram(mSpriteProgram);
glUniform4fv(mSpriteUniformTickcolorIndex, 1, WHITE);
glUniformMatrix4fv(mSpriteUniformMatIndex, 1, GL_FALSE, glm::value_ptr(trans));
/* Draw tick marks on y axis */
glUniform1i(mSpriteUniformTickaxisIndex, 1);
glDrawArrays(GL_POINTS, 4, mTickCount);
/* Draw tick marks on x axis */
glUniform1i(mSpriteUniformTickaxisIndex, 0);
glDrawArrays(GL_POINTS, 4+mTickCount, mTickCount);
glUseProgram(0);
glPointSize(1);
Chart2D::unbindResources();
renderTickLabels(pWindowId, int(w), int(h), mYText, trans, 0, false);
renderTickLabels(pWindowId, int(w), int(h), mXText, trans, mTickCount, false);
auto &fonter = getChartFont();
fonter->setOthro2D(int(w), int(h));
float pos[2];
/* render chart axes titles */
if (!mYTitle.empty()) {
glm::vec4 res = trans * glm::vec4(-1.0f, 0.0f, 0.0f, 1.0f);
pos[0] = w*(res.x+1.0f)/2.0f;
pos[1] = h*(res.y+1.0f)/2.0f;
pos[0] += (mTickSize * (w/pVPW));
fonter->render(pWindowId, pos, WHITE, mYTitle.c_str(), CHART2D_FONT_SIZE, true);
}
if (!mXTitle.empty()) {
glm::vec4 res = trans * glm::vec4(0.0f, -1.0f, 0.0f, 1.0f);
pos[0] = w*(res.x+1.0f)/2.0f;
pos[1] = h*(res.y+1.0f)/2.0f;
pos[1] += (mTickSize * (h/pVPH));
fonter->render(pWindowId, pos, WHITE, mXTitle.c_str(), CHART2D_FONT_SIZE);
}
CheckGL("End Chart2D::renderChart");
}